193 pubblicazioni classificate nel seguente modo:

Laboratory study to evaluate the influence of reclaimed asphalt content on performance of recycled porous asphalt
JOURNAL OF TESTING AND EVALUATION
Autore/i: Frigio, Francesca; Pasquini, Emiliano; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Road-pavement maintenance and rehabilitation are more frequently performed on porous asphalt (PA) surface layers because of their inherent low durability. Such activities lead to the production of a considerable amount of reclaimed asphalt (RA), mainly from PA layers and from the heavy use of virgin non-renewable natural resources, because of the fact that the use of RA is not usually allowed in PA. In this sense, the use of milled materials from old PA wearing courses in new PA layers promotes an important cycle of re-use that should be encouraged. The experimental study aims to investigate the performance of recycled PA mixtures prepared by partly substituting virgin aggregates with selected coarse RA from a milled PA wearing course. A reference PA mixture (without RA) and six recycled PA mixtures prepared with two amounts of RA (20 % and 25 %) and three total binder contents (5.25 %, 5.50 %, and 5.75 %) were investigated in terms of compactability, durability, and water resistance. In this sense, indirect tensile strength (ITS) tests, particle loss (Cantabro) tests, semicircular bending (SCB) tests, and repeated indirect tensile tests were carried out in both dry and wet conditions. Moreover, compactability properties of the reference PA mixture and the recycled PA mixtures were compared. Results showed that recycled PA mixtures with 20 % and 25 % of RA can perform as well as the reference PA mixture in terms of moisture resistance and durability if an accurate mix design is performed. The optimum total binder content was found to increase as the amount of RA increases, because of the fact that a prominent part of the aged binder acts as “black aggregate.” Finally, on the basis of a performance-based equivalence principle, a reliable approach for a practical method able to predict the amount of “re-activated” binder within the RA is proposed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/224127

Mechanical 3D characterization of epoxy asphalt concrete for pavement layers of orthotropic steel decks
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Bocci, E.; Graziani, Andrea; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Epoxy asphalt has been used for over 40 years to pave orthotropic steel deck bridges. However, few investigations have aimed at evaluating and modelling its rheological behaviour. The present paper deals with the three dimensional viscoelastic characterization of epoxy asphalt concrete (EAC) in the frequency domain, focusing on the complex Young's modulus and the complex Poisson's ratio. Cyclic compression tests were performed on cylindrical specimens, providing the measurement of axial and transverse strains. A conventional frequency sweep procedure was followed for different test temperatures. In addition, ordinary hot mix asphalt (HMA) specimens were tested as reference. The time-temperature superposition principle and the Huet-Sayegh rheological model were used to analyse the experimental data. Indirect tensile strength and water sensitivity were also evaluated. Results showed that EAC had higher stiffness and thermal sensitivity with respect to HMA. The complex Poisson's ratio of both EAC and HMA was found to be dependent on temperature and frequency: absolute value ranged from 0.30 to 0.42 and from 0.27 to 0.45, respectively, while the phase angles were lower than 5°.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/224128

Use of reclaimed asphalt in porous asphalt mixtures: laboratory and field evaluations
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
Autore/i: Frigio, Francesca; Pasquini, Emiliano; Partl, Manfred N.; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Maintenance and reconstruction of road pavements involve the production of huge amount of discarded material, such as reclaimed asphalt (RA), every year. As a consequence, issues related to RA stockpiles and disposals are dramatically increasing. At the same time, the growing importance of environmental and economic matters has led researchers and engineers to promote reusing milled materials rather than using valuable and nonrenewable natural resources (bitumen and aggregates). Road pavement maintenance and construction usually involve the use of porous asphalt (PA) mixtures, in particular in the case of motorways and highways. In fact, PA mixtures are widely employed as pavement surface layer thanks to their ability in reducing traffic noise and enhancing safety in wet conditions. In this sense, the reuse of RA into PA should be strongly encouraged. Unfortunately, technical specifications adopted in many countries do not allow any recycled materials in porous asphalt surface layers yet. Thus, reliable techniques allowing the use of RA in new PA mixtures are needed. In this research study, the use of coarse RA from old PA as aggregate in new PA mixtures was evaluated. Because a previous laboratory study demonstrated that the use of 15% of RA aggregates in PA mixtures seems possible (or even recommendable) as long as an accurate mix design with adequate binder contents is performed, new laboratory and field evaluations on recycled PA mixtures with15% of RA aggregates were carried out. On one hand, cyclic coaxial shear tests (CASTs) were performed under both dry and water-submerged conditions in order to evaluate the simultaneous effect of traffic and water exposure. On the other hand, a comprehensive laboratory experimental program for assessing acceptability, durability, fracture resistance, and water sensitivity was carried out on materials taken from the field during the construction of a full-scale trial section. Moreover, drainage properties of surface layers were measured along such a trial section. Overall test results demonstrated that including 15% of selected coarse recycled aggregates into porous asphalt mixtures does not compromise performances and durability of both asphalt-plant and laboratory produced mixtures. It was demonstrated that recycled mixture with 5.25% of total binder content and prepared by accurate mix design can perform as well as (or even better than) standard PA mixture in terms of workability, acceptability, abrasion resistance, repeated loading resistance, fracture propagation resistance, moisture sensitivity, and water drainability.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/223746

Editor's corner - 8th International RILEM Symposium “Testing and Characterization of Sustainable & Innovative Bituminous Materials” (SIB2015), 7-9 October 2015, Ancona, Italy
INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY
Autore/i: Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/325618

Complex Poisson’s ratio of bituminous mixtures: measurement and modeling
MATERIALS AND STRUCTURES
Autore/i: Graziani, Andrea; Bocci, Maurizio; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Mechanical characterization of bituminous mixtures in the linear viscoelastic (LVE) domain is commonly limited to the measurement of a single (mono--dimensional) material function, either the Young's modulus or the shear modulus. Even under the additional hypothesis of isotropy, a complete (three-dimensional) description of the LVE response requires two material functions to be determined simultaneously and in the same experimental conditions. The measurement of viscoelastic Poisson's ratio, though generally overlooked because of the high accuracy and precision required, offers the opportunity to put aside this limitation because it can be achieved in experimental conditions that are very similar to those employed to obtain the Young's modulus. In the present experimental research the concurrent determination of the complex Poisson's ratio and the complex Young's modulus of a bituminous mixture is presented. A rheological model is employed to fit the measured complex-valued material functions and the validity of the time-temperature superposition principle is investigated. The experimental program consists of cyclic compression tests performed on cylindrical samples, with the measurement of axial and transverse strains. A conventional frequency sweep procedure is followed in a range of intermediate service temperatures. Two strain levels are chosen focusing the attention on the linear domain. In addition, samples with different air voids content are tested to observe the effect of the aggregate skeleton. Results allowed to characterize frequency and temperature dependance of the complex Poisson's ratio and make a comparison to that of the complex Young's modulus on the basis of the selected rheological model. Experimental data confirm the validity of the time--temperature superposition principle but suggest that different shift factors may be required to correctly translate the time--temperature dependance of different material functions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/112464

Chemical and rheological analysis of modified bitumens blended with "artificial reclaimed bitumen"
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Stimilli, Arianna; Ferrotti, Gilda; Conti, Carla; Tosi, G.; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Bitumen characteristics are fundamental for the development of good performance in asphalt mixtures, particularly when the mix includes Reclaimed Asphalt (RA) as aged bitumen can strongly affect the properties of the final bituminous phase. In this study three modified bitumens with different contents (1.8%, 2.8% and 3.8%) of SBS polymer were selected. Blends of these bitumens with various percentages of an artificial reclaimed bitumen (itself polymer modified), long-term aged in laboratory, were analyzed. A chemical characterization together with classical and innovative rheological tests were performed. The chemical investigation conducted using FTIR analysis showed that different percentages of artificial reclaimed bitumen included in the blends influence the final SBS amount. Rheological tests demonstrated that the addition of the artificial reclaimed bitumen does not penalize the final bituminous blend characteristics thereby indicating that the maximum amount of Reclaimed Asphalt incorporable in a mixture (according to the highest percentage of artificial reclaimed bitumen investigated) does not appear to be limited by the rheological characteristics of the final bituminous phase.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/174502

Bulk and shear characterization of bituminous mixtures in the linear viscoelastic domain
MECHANICS OF TIME-DEPENDENT MATERIALS
Autore/i: Graziani, Andrea; Bocci, E.; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Traffic loads and temperature variations produce three-dimensional stress–strain fields inside road pavements, and therefore the characterization of bituminous mixtures in different deformation modes is important for prediction of the performance of pavement structures. This paper presents a methodology for the bulk and shear characterization of bituminous mixtures in the linear viscoelastic domain, under the hypothesis of material isotropy, by means of uniaxial harmonic tests with the measurement of axial and transverse strains. The theoretical approach was based on the application of the elastic–viscoelastic correspondence principle and was validated by performing tension–compression tests at selected frequencies and temperatures on asphalt concrete specimens characterized by different volumetric properties. The results showed that since uniaxial tests induced both volume and shape variations, the simultaneous measurement of the complex bulk and shear moduli was possible. The validity of the time–temperature superposition principle was also verified for both deformation modes, allowing the construction of master curves for the bulk and shear moduli. The results also showed that the total dissipated energy could be decomposed into its volumetric and deviatoric fractions with excellent accuracy.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/223720

Influence of polymer modification on asphalt binder dynamic and steady flow viscosities
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Cardone, Fabrizio; Ferrotti, Gilda; Frigio, Francesca; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Asphalt pavement performance such as rutting, crack initiation and propagation as well as fatigue behaviour are substantially affected by the rheological properties of the bitumen. In this sense, the use of polymer modification in road paving applications has been growing rapidly over the last decade as it allows significant enhancements in bitumen properties with consequent improvement in road service life. In fact, the use of polymer modified bitumens (PMBs) leads to pavements characterized by higher resistance to rutting and thermal cracking and lower fatigue damage, stripping and thermal susceptibility. This paper presents a laboratory investigation concerning the effect of polymer modification on the flow behaviour of bitumens. Two different polymers, an elastomer and a plastomer, were used as bitumen modifying agents at three different percentages (2%, 4% and 6% by bitumen weight). Oscillatory mechanical analysis as well as viscosity measurements under steady state conditions were performed taking into account different testing parameters such as temperature, loading frequency and shear rate. The results confirm that the rheological properties of PMBs are strongly influenced by polymer nature and polymer content. The bitumen viscosity on the dynamic domain was combined with that in the steady-state domain, confirming the applicability of the Cox–Merz relationship for the plain bitumen and the PMBs with low polymer content. Finally, the Cross and the Carreau models were found to be suitable to fit the steady state and the dynamic results in order to determine the viscosity function of the investigated bitumens.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/189504

Experimental characterization of high-performance fiber-reinforced cold mix asphalt mixtures
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Ferrotti, Gilda; Pasquini, Emiliano; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Maintenance of existing road pavements assumes increasing interest as the traffic growing produces a faster deterioration of road infrastructures compromising safety and pavement serviceability. In order to guarantee long-lasting pavement repairs, maintenance activities and products must be optimized in terms of both achieved performance and curing times to reach a proper pavement serviceability. This research project focuses on the experimental characterization of a high-performance cold mix asphalt mixture reinforced with three types of fibers (cellulose, glass–cellulose, nylon–polyester–cellulose) dosed at two different contents (0.15% and 0.30% by the aggregate weight). Such materials were investigated at different curing times (1, 7, 14, 28 days) and conditions (dry and wet). Laboratory tests (Marshall, Indirect Tensile, Abrasion and Compactability) usually employed for hot mix asphalts were considered, adjusting the testing procedures taking into account the specific characteristics of cold mixes. Results showed that the mix with 0.15% cellulose fibers provides similar (for curing times of 14 and 28 days) or even higher performance (for curing times within 7 days) than the standard mixture (without fibers). Finally, the last two mixtures were compared with two cold mix asphalt mixes available on the market. The cellulosefiber- reinforced material and the standard one showed enhanced performance, allowing the conclusion that they can be more successfully used in maintenance activities.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/174503

Structural response of grid-reinforced bituminous pavements
MATERIALS AND STRUCTURES
Autore/i: Graziani, Andrea; Emiliano, Pasquini; Ferrotti, Gilda; Virgili, Amedeo; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Grid reinforcement is becoming a standard construction and rehabilitation technique to improve the performance of bituminous pavements. Currently, selection of the appropriate grid type and position is based on empirical criteria or derived from the results of laboratory tests which consider a single aspect of the mechanical behavior of the grid-reinforced systems. An improvement in the existing design and testing approaches could be obtained considering the actual response of grid-reinforced systems under vehicular loads. An instrumented pavement section was constructed to achieve this objective by installing a glass fiber polymer grid (FP) and a carbon fiber/glass fiber grid (CF) inside a double-layered asphalt surfacing along an in-service road. This pavement is part of a wider project which also involves a RILEM inter-laboratory test on the same reinforced systems. The pavement response to falling weight deflectometer (FWD) and real-scale truck loads was measured using pressure cells and asphalt strain gauges installed inside the pavement. A layered elastic theory (LET) model was adopted to perform both back-calculation of layer moduli and forward-calculation (simulation) of pavement stress and strain. The FWD and the real-scale tests yielded congruent results highlighting that the strain field inside the double-layered surfacing was considerably reduced by the installation of the CF/glass fiber grid whereas the glass FP grid was probably too stiff, potentially leading to interface debonding. The LET model proved to be a simple and effective tool for a first-approach analysis of the reinforcement pavement response.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/150303

Advanced Characterization of Clear Chip Seals
JOURNAL OF TESTING AND EVALUATION
Autore/i: Pasquini, Emiliano; Bonati, A.; Giuliani, F.; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Chip seals are widely used throughout the world for the construction and preventive maintenance of asphalt pavements because they are recognized as cost-effective solutions able to improve skid resistance while creating a waterproof surface. On the other hand, chip seals are often affected by early stone loss because of several, not always easily manageable, material-related and traffic-related factors. It is, therefore, in the interest of researchers to develop scientific methods able to predict the aggregate retention performance of chip seals. Given this background, in the present paper, a performance-based evaluation of chip seals with regard to aggregate retention properties is carried out through a laboratory test based on the Ancona shear testing research and analysis equipment. In this study, a chip seal prepared with a clear emulsion derived by emulsifying a synthetic clear binder was analyzed and compared with two traditional chip seals manufactured with a plain cationic bituminous emulsion and a styrene butadiene styrene polymer-modified asphalt emulsion, respectively. Specifically, six chip seals obtained by combining the three selected emulsions with two types of aggregates (crushed limestone and basalt) were tested at three different temperatures. Moreover, a rheological characterization of emulsion residues was also carried out through the dynamic shear rheometer and the binder bond strength adhesion tester. Results mainly showed that the investigated clear synthetic emulsion can be successfully used for the construction of clear chip seals in combination with aggregates of different mineralogy.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/223740

Laboratory characterisation of optimised geocomposites for asphalt pavement reinforcement
GEOSYNTHETICS INTERNATIONAL
Autore/i: Pasquini, Emiliano; Bocci, Maurizio; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/175107

Synthesis of standards and procedures for specimen preparation and in-field evaluation of cold-recycled asphalt mixtures
ROAD MATERIALS AND PAVEMENT DESIGN
Autore/i: Gabriele, Tebaldi; Eshan V., Dave; Paul, Marsac; Patrick, Muraya; Martin, Hugener; Marco, Pasetto; Graziani, Andrea; Andrea, Grilli; Bocci, Maurizio; Alessandro, Marradi; Louisette, Wendling; Vincent, Gaudefroy; Kim, Jenkins; Andreas, Loizos; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: The use of recycled asphalt (RA) materials in pavement rehabilitation processes is continuously increasing as recycling techniques, such as cold recycling (CR), are being utilised in increasing magnitude and greater awareness for use of recycled materials and consideration of sustainable practices is becoming common in the construction industry. The focus of this paper is on developing a state of the art and state of the practice summary of processes used for classification of RA as well as the curing and specimen preparation practices for cold-recycled asphalt mixtures. A variety of topics were explored through an exhaustive literature search, these include RA production methods, definition of RA materials, stockpiling practices, industrial operations, specimen curing and preparation practices and in-field evaluation of cold-recycled rehabilitation. This paper was developed through efforts of CR task group (TG6) of RILEM Technical Committee on Testing and Characterization of Sustainable Innovative Bituminous Materials and Systems (TC-237 SIB).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/150304

Moisture sensitivity of interlayers between conventional and porous asphalt mixes
ASPHALT PAVEMENTS - Proceedings of the International Conference on Asphalt Pavements
Autore/i: Pasquini, Emiliano; Cardone, Fabrizio; Canestrari, Francesco
Editore: Y. Richard Kim
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The use of geocomposites obtained combining bituminous membranes with reinforcing geosynthetics represents a promising option for asphalt pavement application. Thanks to their waterproofing effect, such geocomposites could be successfully used also underneath porous surface layers as an alternative of bituminous tack coat. In this sense, one of the major issue related to the use of geocomposites at the interface between porous surface layers and binder courses is the prolonged contact with drained rainfall water. Given this background, a specific research study was carried out in order to evaluate the moisture sensitivity of interlayers positioned between traditional dense graded asphalt concretes and porous asphalt concretes. Particularly, two geocomposite materials produced combining an elastomeric membrane with a polyester textile and a fiberglass grid, respectively, were investigated along with a traditional reference interlayer obtained by applying hot polymer modified asphalt at the interface. In order to evaluate moisture sensitivity of such interlayers, shear tests were carried out in both dry and wet conditions on double- layered samples prepared in the laboratory. Experimental results showed that the prolonged action of the water did not produce loss of performances of studied interlayers in terms of interface shear strength.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/189506

Original Approach to Predict Fatigue Endurance Limit of Asphalt Binders Considering Healing Capacity
Rheology and processing of construction materials
Autore/i: Canestrari, Francesco; Graziani, Andrea; Virgili, Amedeo; Stimilli, Arianna
Editore: Nicolas Roussel and Hela Bessaies-Bey
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: More phenomena interact (e.g. viscoelasticity, damage, healing) contributing to the overall behavior of binders in terms of fatigue endurance limit. However, currently there is no consolidated analytical approach inclusive of strength recovery during rest periods to characterize fatigue performance. This research proposes a criterion to determine the resistance of binders subjected to monotonous cyclic loading with multiple rest times by using a Dynamic Shear Rheometer. Main rheological properties are measured and the modeling of their evolution during each stage is proposed. The experimental program includes different binders in order to investigate the effects of SBS modification levels and aged binder contents on healing potential. Beyond the classical component related to damage analysis, the proposed criterion enables to identify other fundamental contributions, leading to a comprehensive fatigue endurance limit. This approach allows distinguishing binders taking into account their healing capacity and should provide a better correlation with in-service performance of mixtures.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/115070

Assessment of Healing in Asphalt through Diffusion Mechanism
Proceedings of EATA Conference
Autore/i: H. U., Bahia; F., Yousefirad; Stimilli, Arianna; H. A., Tabatabaee; Canestrari, Francesco
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/115069

An experimental approach to the rheological characterization of bituminous mixture based on pseudo-random stress excitations
Rheology and Processing of Construction Materials
Autore/i: Virgili, Amedeo; Canestrari, Francesco; Graziani, Andrea
Editore: Nicolas Roussel and Hela Bessaies-Bey
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Rheological behavior of bituminous mixtures in the small strain domain is effectively described by the Linear Visco-­‐Elasticity (LVE) theory. Since the response of LVE materials is equivalent to that of Linear Time-­‐Invariant (LTI) systems, material functions that are used to characterize LVE behavior in the frequency domain can be considered as Frequency Response Functions (FRF) of a LTI system. In this experimental research a pseudo-­‐random stress excitation, comprising a broad band of harmonic components, is used to estimate the LVE response function of a bituminous mixture using signals and systems oriented techniques. Cylindrical specimens were tested in tension-compressions configuration, both excitation (stress) and response (strain) signals were analyzed using a spectral analysis. The FRF estimated using pseudo-­random experiments is compared with conventional harmonic analysis results. Advantages and limitations of the proposed approach are highlighted, paying particular attention to the possible effects of non-­‐linearity and viscoplastic deformations.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/115071

Rheological Properties of Bituminous Binders with Synthetic Wax
INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY
Autore/i: Canestrari, Francesco; Graziani, Andrea; Pannunzio, V; Bahia, H. U.
Classificazione: 1 Contributo su Rivista
Abstract: Warm Mix Asphalt (WMA) has been introduced to reduce the environmental impact and improve energy efficiency of bituminous mixtures production and lay down. With this purpose, synthetic waxes are effectively used to allow reduction of temperature during mixing and compaction. Given these advantages, the basic WMA challenge is the production of a pavement mixture having, at least, the same performance as traditional HMA. This study describes the effect of a synthetic wax additive on the rheological properties of a paving grade bitumen in a wide range of temperatures. The effect of wax at mixing and compaction temperatures (T > 100°C) was evaluated using viscosity tests. A Dynamic Shear Rheometer (DSR) and a Bending Beam Rheometer (BBR) were used to investigate the rheological properties of the base and the WMA binder at midrange and low service temperatures (from 18°C to 37°C). The time-temperature superposition principle was applied to analyze the complex shear modulus and the creep stiffness modulus, through the construction of master curves. Particular attention was devoted to the study of wax effect on low temperature physical hardening.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/81957

Improved durability of recycled porous asphalt
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Frigio, Francesca; Pasquini, Emiliano; Ferrotti, Gilda; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Porous asphalt mixtures are extensively used as highway surface layer due to their benefit in improving skid resistance and reducing spray and splash effects during wet conditions. Moreover, porous asphalts (PA) are also oriented towards the reduction of road traffic noise thanks to enhanced sound absorption capabilities. Nevertheless, the limited durability of porous asphalt layers leads to frequent maintenance and rehabilitation activities. In this study, the use of course reclaimed asphalt (RA), obtained by milling old porous surface layers, as aggregate in new PA mixtures was evaluated. Preliminary, Binder Bond Strength tests on coated and uncoated basalt aggregate substrates showed encouraging results in terms of adhesion properties between unaged polymer modified bitumens and substrates coated with aged bitumens, simulating RA aggregates. Thus, five porous asphalt mixtures prepared with 15% course RA aggregates and different total binder contents were studied in the laboratory. A reference PA mixture containing only virgin aggregates was also investigated for comparison purposes. Indirect tensile strength tests, particle loss (Cantabro) tests, semi circular bending (SCB) tests and repeated indirect tensile tests were carried out in both dry and wet conditions in order to evaluate acceptability, durability, fracture resistance and water sensitivity of recycled mixtures. Results showed that recycled porous asphalt mixtures can perform as well as (or even better than) reference one. In particular, recycled mixtures at equal or higher binder contents than the reference mixture demonstrated an improvement in moisture resistance and durability.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/115068

Laboratory characterisation and field validation of geogrid-reinforced asphalt pavements
ROAD MATERIALS AND PAVEMENT DESIGN
Autore/i: Pasquini, Emiliano; Bocci, Maurizio; Ferrotti, Gilda; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: In order to improve the mechanical properties of pavements, reinforcement systems can be employed in asphalt layers. However, the presence of a grid at the interface causes an interlayer de-bonding effect. Moreover, a real challenge is related to the proper in situ installation of grids. The present research aims to evaluate the effectiveness of pavement rehabilitation with fibreglass geogrids. To this purpose, a real-scale field trial was constructed and monitored through Falling Weight Deflectometer measurements. Interface shear tests and flexural tests were also carried out on double-layered samples prepared in the laboratory reproducing realscale field trial characteristics. Moreover, shear tests were also performed on in situ cored specimens. Results mainly showed that a proper installation of the reinforcement is fundamental in order to obtain suitable test results and good pavement performance.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82572

Performance Evaluation of Cold Recycled Mixture Containing High Percentage of Reclaimed Asphalt
ROAD MATERIALS AND PAVEMENT DESIGN
Autore/i: Stimilli, Arianna; Ferrotti, Gilda; Graziani, Andrea; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: Cold recycling of asphalt pavements proved to be an effective maintenance and rehabilitation technology for both environmental and economic reasons. Nevertheless, the use of cold-recycled (CR) asphalt mixtures requires a careful assessment of their mechanical properties, especially when they are designed to replace traditional hot-mix asphalt concrete (AC) mixtures. In this study, the potential use of a CR asphalt mixture as base course of an Italian motorway was evaluated. The studied mixture was produced in a central plant employing high-reclaimed asphalt (RA) content and used to construct two experimental sections along an in-service Italian motorway. In particular, a special mixing procedure, involving the use of water vapour and bituminous emulsion, was tested. A third experimental section was constructed with the same layer thickness using the AC mixture currently used in rehabilitation projects, incorporating 30% of RA. Volumetric properties, stiffness, resistance to permanent deformation and fatigue behaviour of mixtures were investigated by performing tests on samples cored from the three test sections and on laboratory-compacted samples. Results of the mechanical tests showed that CR mixtures provide lower stiffness modulus and lower resistance to repeated loading, but better resistance to permanent deformation when compared with AC. This behaviour can be explained due to the presence of cementitious bonds that reduce thermal sensitivity and viscous response.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/115065

Mechanical Testing of Interlayer Bonding in Asphalt Pavements
State-of-the-Art-Report of the RILEM Technical Committee 206-ATB: Advances in Interlaboratory Testing and Evaluation of Bituminous Materials
Autore/i: Canestrari, Francesco; Ferrotti, Gilda; X., Lu; A., Millien; M. N., Partl; C., Petit; A., Phelipot Mardelé; H., Piber; C., Raab
Editore: M.N.Partl, H.U. Bahia, F. Canestrari, C. de la Roche, H. Di Benedetto, H. Piber, D. Sybilski
Classificazione: 2 Contributo in Volume
Abstract: Steadily increasing requirements on pavement performance properties, in terms of bearing capacity and durability, as well as new innovative developments regarding pavement materials and construction, are observed worldwide. In this context interlayer bonding at the interfaces of multi-layered bituminous systems is recognized as a key issue for the evaluation of the effects, in terms of stress-strain distribution, produced by traffic loads in road pavements. For this reason a correct assessment of interlayer bonding is of primary importance, and research efforts should be addressed in order to improve the lack of correlation and/or harmonization among test methods. Following this principle RILEM TG 4 organized an interlaboratory test in order to compare the different test procedures to assess the interlayer bonding properties of asphalt pavement. The results of the experimental research are presented with a preliminary overview of basic elements, test methods and experimental investigations on interlayer bonding. Then the RILEM TG 4 experimental activities, based on the construction of three real-scale pavement sections, are presented in detail. Each pavement section wascomposed of two layers, and three different interface conditions were chosen. The first pavement was laid without interface treatment and the others with two different types of emulsion. Fourteen laboratories from 11 countries participated in this study and carried out shear or torque tests on 1,400 cores. The maximum shear or torque load and the corresponding displacement were measured, and the shear or torque strength was calculated as a function of the following parameters: diameter, test temperature, test speed, stress applied normal to the interface and age of the specimen. The results of this study are presented in terms of precision and correlations regarding the parameters which results in useful information on asphalt pavement interlayer bond tests.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82957

Experimental Evaluation of Shear Resistance of Improved Steel-Asphalt Interfaces
TRANSPORTATION RESEARCH RECORD
Autore/i: Bocci, Edoardo; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/115066

Optimization of Geocomposites for Double-Layered Bituminous Systems
RILEM Bookseries
Autore/i: Canestrari, Francesco; Pasquini, Emiliano; Belogi, Leonello
Editore: Scarpas A.,Kringos N.,Al-Qadi I.L.,Loizos A.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In order to improve pavement service life, reinforcement systems can be employed in asphalt layers. In this regard, geocomposites obtained by combining geomembranes with geogrids represent a promising option because they should allow both waterproofing and improved mechanical properties of asphalt pavements. However, the presence of reinforcement may cause an interlayer de-bonding effect that negatively influences overall pavement strength. Given this background, the present research aimed at evaluating the effectiveness of pavement rehabilitation with geocomposites in the laboratory. In particular, the present experimental study intended to implement new products by selecting the optimum combination among different geomembrane compounds, reinforcement types, reinforcement positions and interface conditions. The laboratory investigation was preliminarily organized to perform interface shear tests by means of the ASTRA apparatus. Then, on the basis of the results of the previous phase, the more promising configurations were selected to be further evaluated by means of the three-point bending tests. Specimens were obtained from double-layered slabs compacted in the laboratory. The results presented in this paper enabled the preliminary tuning for the selection of optimized composites to be submitted, in the near future, to performance-related dynamic tests and in situ monitoring of real scale trial sections.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82569

Experimental evaluation of the influence of surface coating on fiberglass geogrid performance in asphalt pavements
GEOTEXTILES AND GEOMEMBRANES
Autore/i: Ferrotti, Gilda; Canestrari, Francesco; Pasquini, Emiliano; Virgili, Amedeo
Classificazione: 1 Contributo su Rivista
Abstract: In road infrastructures, the maintenance of existing pavements is one of the most important issues to deal with. In order to optimize rehabilitation costs and increase pavement service life, innovative technical solutions have been developed. One of the most widespread techniques introduced for this scope, consists in the application of geogrids at the interface between different layers of pavement structures. Geogrids provide different performance depending on their characteristics, such as constituent materials, surface coating, mesh geometry and dimensions, and on their position in the pavement structure. In fact, these materials can be placed between different layers (bounded and/or unbounded) carrying out different functions. In this survey, the reinforcement of asphalt concrete layers was studied in laboratory, paying particular attention to the effects that different surface coatings, consisting in different treatments of the surface of the mesh elements of the geogrid, produce on the performance of fiberglass reinforced asphalt concrete specimens. The experimental analysis was carried out in two different stages. During the first stage, the coatings themselves were investigated, studying their adhesion properties with a conventional asphalt binder, in order to check their capability to adhere to the constitutive material of an asphalt concrete. During the second stage, a specific testing protocol was followed in order to investigate the performance of double-layered asphalt concrete specimens by means of interlayer shear tests and four-point bending tests. The results showed that the testing protocol used is suitable for studying, in laboratory, the performance of reinforced pavements, that could be influenced, both in terms of interlayer bonding between asphalt concrete layers and four-point bending test characteristics, by the application of a coating on the surface of the geogrids.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/71051

An application to the European practice of the Bailey Method for HMA aggregate grading design
PROCEDIA: SOCIAL & BEHAVIORAL SCIENCES
Autore/i: Graziani, Andrea; Ferrotti, Gilda; Pasquini, Emiliano; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: The Bailey Method provides a set of tools for the design and the evaluation of aggregate packing and voids of asphalt concrete grading while maintaining appropriate mixture workability and durability. In this study, concepts, procedures and parameters of the Bailey Method, that is strongly based on sieves and aggregate sizes adopted in the USA, were applied in the European perspective. To this aim, two sets of asphalt mixtures were designed applying the Bailey Method. The study shows that the European practice for aggregate grading design allows the application of the Bailey Method criteria confirming the validity of its basic principles.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/81959

Experimental Study on Shear Fatigue Behavior and Stiffness Performance of Warm Mix Asphalt by adding Synthetic Wax
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Petit, C.; Millien, A.; Canestrari, Francesco; Pannunzio, V.; Virgili, Amedeo
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/71053

Analysis of structural compatibility at interface between asphalt concrete pavements and orthotropic steel deck surfaces
TRANSPORTATION RESEARCH RECORD
Autore/i: Bocci, Edoardo; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/87846

Durability Assessment of Asphalt Rubber Mixtures
INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY
Autore/i: Pasquini, Emiliano; Canestrari, Francesco; Santagata, Felice Ausilio
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, a gap graded Asphalt Rubber Asphalt Concrete (ARAC) was studied to carefully assess durability aspects, such as moisture sensitivity, aging resistance, and abrasion resistance that contribute to establishing an important database of ARAC engineering performance. In particular, moisture sensitivity was investigated through indirect tensile and Cantabro tests on dry and wet conditioned specimens while the aging resistance was assessed in terms of change in the stiffness modulus, fatigue life, and Cantabro particle loss after the laboratory simulated long-term aging of the AR mixture. Finally, Cantabro test results on dry and un-aged samples were employed to evaluate the abrasion resistance of the studied material. Results were compared with those of reference materials tested in the laboratory or found in literature. The study provided evidence of the strong durability of the investigated Asphalt Rubber (AR) mixture.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/71049

Testing and Characterization of Compacted Asphalt Pavement Materials
International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Autore/i: Partl, M. N.; di Benedetto, H.; Canestrari, Francesco; Bahia, H. U.
Editore: RILEM Publications SARL
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: ABSTRACT. This paper summarizes some key achievements and findings by the RILEM TC 206 ATB “advanced testing and characterization of bituminous materials” taking into account new developments in the field of bituminous road materials and test methods. These developments were triggered not only by an increasing variety of materials and requirements on the performance of bituminous pavement systems but also by environmentally driven innovations in terms of recycling and low temperature asphalt and new types of binders. Work on compacted asphalt pavement materials included interlaboratory wheel tracking tests on material from real motorways well as interlayer shear bond testing on material taken from specially constructed test sections. New developments in asphalt mixture testing, such as the application of image analysis techniques, were also taken into consideration. Results show that performance of bituminous mixtures must be considered also with respect to the whole pavement system. This is particularly true, e.g., in case of rutting tests, compaction and specimen preparation evaluation as well as interlayer bond properties. It was also found that test methods developed for one type of bituminous materials do not a priory apply to another type of bituminous materials and may even lead to completely misleading conclusions as compared to real life pavement performance.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/71031

Performance evaluation of gap graded Asphalt Rubber mixtures
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Pasquini, E; Canestrari, Francesco; Cardone, Fabrizio; Santagata, F. A.
Classificazione: 1 Contributo su Rivista
Abstract: In this research, an extensive laboratory test program was conducted in order to investigate the mechanical performance (stiffness, fatigue, permanent deformation and thermal cracking) of a gap graded Asphalt Rubber Asphalt Concrete (ARAC) establishing an important database of ARAC engineering performance. Additional tests were performed on Asphalt Rubber binder and ARAC mix in order to verify whether the new Mechanistic Empirical Pavement Design Guide (MEPDG) can be used effectively for AR materials. Results were compared with those of reference materials tested in laboratory or found in literature.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53959

A strategic laboratory approach for the performance investigation of geogrids in flexible pavements
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Ferrotti, Gilda; Canestrari, Francesco; Virgili, Amedeo; Grilli, A.
Classificazione: 1 Contributo su Rivista
Abstract: ABSTRACT: Nowadays, the increasing request in terms of road transport makes maintenance and rehabilitation of road infrastructures key tasks for road engineering. In recent years, numerous products/materials have been introduced on the market and can be used in combination or singly in order to extend pavement life and guarantee high performance. Among them, geosynthetics can play different roles in pavement structures, such as draining, reinforcement, filtering, separation, protection, and proofing. This research focuses on the validation of a strategic laboratory approach for the study of the mechanical performance of reinforced systems used in flexible pavements, combining repeated loading cycles in a four-point bending configuration with interlayer shear tests. This method can be used in further research analysis to compare unreinforced and reinforced double-layered systems. The results obtained in this investigation showed that the fiberglass grid used provides a relevant contribution to the performance of the asphalt concrete system studied.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/71045

Pavimentazioni Rinforzate - Progetto Pilota nella Provincia Autonoma di Bolzano
STRADE & AUTOSTRADE
Autore/i: Bocci, Maurizio; Canestrari, Francesco; Ferrotti, Gilda; Pasquini, Emiliano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/54829

Acoustic characterization of Asphalt Rubber mixtures in Italy
INTERNOISE 2010 - Proceedings of the 39th International Congress on Noise Control Engineering
Autore/i: Pasquini, Emiliano; Canestrari, Francesco; Ferrotti, Gilda; Santagata, Felice Ausilio; Serpilli, F.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Pavements that produce less noise at the tire/pavement interface represent an important strategic solution necessary to minimize traffic acoustic impact. Several international studies showed encouraging results in traffic noise reduction using Asphalt Rubber (AR) mixtures. The Authors present results of an Italian experience that investigates the acoustic properties of AR mixtures, paved on existing roads as wearing course, by means of in situ noise measurements carried out at different stages. These materials were studied through laboratory tests for sound absorption evaluation. Results also evaluate the properties of AR mixtures in limiting traffic noise comparing them with other typical asphalt concretes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42350

Analysis of Water and Thermal Sensitivity of Open Graded Asphalt Rubber Mixtures
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Partl, M. N.; Pasquini, Emiliano; Canestrari, Francesco; Virgili, Amedeo
Classificazione: 1 Contributo su Rivista
Abstract: This research investigates the water and thermal sensitivity of two open graded mixtures prepared with asphalt rubber binder, one mixture containing lightweight aggregates (expanded clay) replacing a part of coarse fraction. Fatigue tests using the CoAxial Shear Test (CAST) apparatus were performed in both dry and wet conditions with and without temperature cycles. Results showed that fatigue resistance of the studied materials was only little affected by water and temperature cycles and superior to traditional open graded mixtures produced with SBS modified bitumen only. The results were also validated and modelled by means of an elasticity-based damage model.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30483

Recycling Techniques and Environmental Issues relating to the Widening of an High Traffic Volume Italian Motorway
INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY
Autore/i: Bocci, Maurizio; Canestrari, Francesco; Grilli, Andrea; Pasquini, Emiliano; Lioi, D.
Classificazione: 1 Contributo su Rivista
Abstract: On the last few decades, the use of recycled materials has become important because of the limited availability of good aggregates and the difficulties and excessive disposal costs for milled materials. This study provides an environmental evaluation of a specific rehabilitation project involving several recycling techniques on one of the main Italian motorways. Three rehabilitation options are evaluated and compared in terms of their environmental impact, with particular emphasis on the construction of the subbase course. In the end, the definitive design involved different recycling techniques, including cold in-place recycling (CIPR) with bituminous emulsion and cement for the subbase layer, stabilization of the soil with lime for the embankment, the use of reclaimed asphalt in the production of hot mix asphalt, and the use of crushed cement concrete for the cement treated layers. All of these recycling methods allow the saving of the virgin aggregates, and a reduction in materials transportation and pollutant emissions coming from both the production plant and the means of transport.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30753

Adhesive and cohesive properties of asphalt-aggregate systems subjected to moisture damage
ROAD MATERIALS AND PAVEMENT DESIGN
Autore/i: Canestrari, Francesco; Cardone, Fabrizio; Graziani, Andrea; Santagata, F. A.; Bahia, H. U.
Classificazione: 1 Contributo su Rivista
Abstract: The bond strength between asphalt and aggregate plays a fundamental role in evaluating the moisture sensitivity of HMA Mixtures. In this study the effect of water on adhesive and cohesive properties of asphalt-aggregate systems was investigated using a modified version of the PATTI. The device was used to measure the pull-off strength on different asphalt-aggregate combinations and to evaluate the influence of water immersion at two different temperatures. In particular, six asphalt binders were employed in combination with two aggregate types, having different asphalt affinity. The effect of the aggregate surface temperature during specimen preparation was also tested. In the first phase of the study the within-laboratory repeatability of the test procedure was investigated. The results showed the PATTI test is able to evaluate with good precision the pull-off strength and that its repeatability depends on the failure type (adhesive or cohesive). In the second phase of the study a full factorial experiment was employed to verify the reliability of the test for routine use in determining the adhesive and cohesive properties of asphalt-aggregate combinations and the effects of moisture damage. The results showed that, in the dry condition, the test was able to measure the internal cohesion of the asphalt binders. The results also showed the effects of water damage on the pull-off strength and the decisive role of asphalt-aggregate affinity was clearly highlighted. Using wet conditioning of the PATTI samples it was proven that water affects the adhesive bond between asphalt and aggregate much more than the asphalt cohesion. Moreover, the results indicate that aggregate temperature during sample preparation has only a limited effect on the adhesive strength.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50188

Asphalt Rubber: policy disclosure in Italy
Proceedings of the Asphalt Rubber 2009 Conference
Autore/i: Canestrari, Francesco; Pasquini, Emiliano; Santagata, Felice Ausilio; Antunes, I.
Editore: J.B. Sousa, R. Cao
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In the present paper, it is presented a proposal for an evaluation systemic approach aimed at the characterization of Asphalt Rubber Hot Mixes (ARHM). This constituted the input to develop a careful scientific-technical assessment process to assure the quality control of ARHM. In particular, this kind of approach allows i) to take immediate action to technical production and laying of ARHM that should also guarantee “traditional ” Italian road materials specifications ii) to develop AR expertise in terms of mechanical performance (stiffness, fatigue resistance and permanent deformation resistance) and functional properties (noise and skid resistance), trying to bridge the gap of knowledge with the international experience of forty years of successful use iii) to develop innovative scientific research to provide original contributions to engineering road materials investigation.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42349

Modified PATTI test for the characterization of adhesion and cohesion properties of asphalt binders
The Sixth International Conference on Maintenance and Rehabilitation of Pavements and Technological Control
Autore/i: Santagata, F. A.; Cardone, Fabrizio; Canestrari, Francesco; Bahia, H. U.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: It is well known that aggregate-asphalt bond is of fundamental importance for mechanical response and moisture susceptibility of asphalt mixtures. Many researchers have studied moisture effects on the binder adhesion-disbonding properties and their role in defining asphalt mixture performance, but a suitable system to measure binder adhesive properties to aggregates directly is not available yet. This paper includes a study to modify the Pneumatic Adhesion Tensile Testing Instrument (PATTI), which is a standard method used for paints or coatings. The modification is aimed at developing a reliable and practical test protocol for directly evaluating the adhesion/cohesion properties of asphalt binders. To achieve this goal, different asphalt binders and several test variables were varied to study their influence on pulloff strength. The analysis of the results collected indicates that the modified PATTI test protocol show high promise for evaluating adhesive bond strength and moisture susceptibility of asphalt binders. Moreover, the test appears to be simple and practical to allow discriminating different asphalt binders with different adhesion characteristics.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53662

Repeated load test on bituminous systems reinforced by geosynthetics
GEOTEXTILES AND GEOMEMBRANES
Autore/i: Virgili, Amedeo; Canestrari, Francesco; Grilli, Andrea; Santagata, Felice Ausilio
Classificazione: 1 Contributo su Rivista
Abstract: This paper focuses on a better understanding of the influence of geosynthetic reinforcement materials on the flexural behaviour of bi-layer bituminous systems, and evaluates the effects of these materials on bituminous system resistance to repeated loading cycles. In this research project, three different bi-layer reinforced systems were investigated and compared with a non-treated bi-layer system and a bi-layer system with tack coat. In particular, three different geosynthetics were used: a Glass fiber Geogrid, a Polyester Geogrid and a Geomembrane. All bi-layer bituminous systems were tested by means of a four-point bending test under repeated loading cycles. The failure criterion was defined as the number of loading cycles corresponding to the flex point of the permanent deformation evolution, i.e., where the permanent deformation evolution inverts its trend (from decreasing to increasing rate). In order to precisely determine the number of loading cycles corresponding to the flex point of a permanent deformation evolution curve, a descriptive model, based on a classic power law, is presented. The proposed model precisely simulates the mechanical behaviour of bituminous mixtures and allows a reliable comparison amongst the different bituminous systems tested.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51378

Experimental study on cold micro-surfacing with crumb rubber
Proceedings of the 6th Int. Conf. on Maintenance and Rehabilitation of Pavements and Technological Control - MAIREPAV6
Autore/i: Canestrari, Francesco; Pasquini, Emiliano; Ferrotti, Gilda; Riviera, P.
Editore: Ezio Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Nowadays environmental sustainability is one of the main issues which developed countries have to deal with. The aim of this study was to evaluate the possibility of adding crumb rubber coming from reclaimed tires as a dry ingredient in cold micro-surfacing mixes. In fact, these innovative cold bituminous mixtures could allow the recycling of waste tires and reduce tire/road noise. In this paper, the mechanical performance of cold microsurfacing mixes prepared with crumb rubber added in different dosages and sizes was investigated in the laboratory by means of the cohesion test, the modified British wheel tracking test and an innovative test method, expressly designed for thin cold mixes. Moreover, a cold micro-surfacing with the dry addition of crumb rubber was also laid down on a very busy urban road. Acoustic and skid measurements were carried out both in situ and in the laboratory in order to evaluate the functional properties of this new road material.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42345

RILEM Interlaboratory Test on Interlayer Bonding of Asphalt Pavements
Advanced Testing and Characterization on Bituminous Materials
Autore/i: Piber, H; Canestrari, Francesco; Ferrotti, Gilda; Lu, X; Millien, A; Partl, M. N.; Petit, C; PHELIPOT MARDELE', A; Raab, C.
Editore: Taylor & Francis Group
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The RILEM TG 4 organized an interlaboratory test in order to compare the different test procedures to assess the interlayer bonding properties of asphalt pavement. The pavement was composed of two layers. Three different interface conditions were chosen. The first pavement was laid without interface treatment and the others with two different types of emulsion. 14 laboratories from 11 countries participated in this study and carried out shear or torque tests on 1400 cores. The maximum shear or torque load and the corresponding displacement were measured and the shear or torque stress was calculated as a function of the following parameters: diameter, test temperature, test speed, stress applied normal to the interface and age of the specimen. This paper presents the results of this study in terms of precision and correlations regarding the parameters
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42343

Laboratory performance-based evaluation of cold bituminous mixtures for patching applications
Proceedings of the 6th Int. Conf. on Maintenance and Rehabilitation of Pavements and Technological Control
Autore/i: Canestrari, Francesco; Ferrotti, Gilda; Grilli, A; Barbati, S.
Editore: Ezio Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: ABSTRACT: A flexible pavement under repeated loading cycles and environmental conditions is subjected to progressive deterioration and aging. For local roads, two of the main surface distresses on bituminous pavement are raveling and localized depression which lead rapidly to potholes. Since these localized-hazardous failures compromise safety and pavement serviceability, they must be repaired as soon as they occur. Usually, the temporary rehabilitation of local roads subjected to potholes is managed by public administration as emergency treatment or planned maintenance, by using cold bituminous mixtures that are often not able to guarantee a long-lasting pavement repair. In this sense, innovative and high-performance cold bituminous mixtures have been recently optimized, replacing the traditionally used bituminous emulsion with special bitumen, resins, anti-stripping agents and several additional ingredients. The aim of this research project was to improve the knowledge of these products used for patching operations and the proposal of an overall testing protocol able to characterize highperformance cold bituminous mixtures using test procedures and parameters similar to those used for hot mix asphalt. The results showed that the tested material guarantees, under specific curing time and test temperature, higher performance than traditional cold bituminous mixtures and that the proposed test procedure can be used for the evaluation of such high-performance products.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42346

Interlayer bonding design of porous asphalt course interface
Proceedings of the Sixth International Conference on Maintenance and Rehabilitation of Pavements and Technological Control, MAIREPAV6
Autore/i: Canestrari, Francesco; Ferrotti, Gilda; Graziani, Andrea; Baglieri, O.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: ABSTRACT: Interlayer bonding affects performance of asphalt concrete pavements. In order to guarantee good bonding, tack coats are frequently applied at various interfaces. Interlayer bonding design consists in the determination of the optimum tack coat rate and the ASTRA (Ancona Shear Testing Research and Analysis) test method can be used for this purpose. In this study, the tack coat design of the interface between an existing porous asphalt and a newly laid open graded course was developed. In order to check whether the two porous layers are independent or behave as a Twinlay, the drainability of the resulting double-layered system was also investigated. The ASTRA tests showed that acceptable interlayer bonding results can be obtained for each emulsion rate studied but higher tack coat rates mitigate the scatter of the results. In terms of drainability, the porosity of the existing layer does not increase the drainage characteristics of the double-layered system, for each interface treatment considered.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50262

Statistical investigation of two different interlayer shear test methods
THE INTERNATIONAL JOURNAL “MATERIALS AND STRUCTURES
Autore/i: Santagata, Felice Ausilio; Ferrotti, Gilda; M. N., Partl; Canestrari, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: The performance of multi-layered pavement systems strongly depends on interlayer bonding. In order to evaluate this parameter, some countries have developed their own test method. However, different devices generally provide different results due to the test conditions. In this article, the statistical investigation of two interlayer shear test methods is shown considering different asphalt materials and different specimen preparation techniques. Both test methods provided comparable results showing the same ranking in interlayer shear stress for different test conditions and the same level of precision in terms of scatter of the results. Moreover, the repeatability limit was found to be dependent on the test method, the pavement material and the compaction technique. It is worth noting that this extensive experimental investigation paves the way for the incoming European Standardization process involving the two shear test methods.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31459

Acoustic characterization of different road materials
Proceedings of the International ISAP Symposium on Asphalt Pavements and Environment
Autore/i: Santagata, Felice Ausilio; Canestrari, Francesco; Pasquini, Emiliano; Ayr, U; Pisciotta, M.
Editore: M.N. Partl
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Pavements that produce less noise at the tire/pavement interface represent an important strategic solution necessary to minimize the traffic acoustic impact. Several studies have shown how the most important parameters affecting tire noise are associated with the road surface that influences both the generation and propagation of sound waves. On this subject, the Italian National Road Agency (ANAS) sponsored a research project related to quiet pavements. The project was developed by Università Politecnica delle Marche based on a trial section where different kinds of wearing courses were laid down. The selected materials were a Splittmastix Asphalt (SMA), an Open Graded Friction Course (OGFC) and a dense graded asphalt containing Expanded Clay (EC). Furthermore, two sub-sections of SMA and of OGFC were covered respectively with a Slurry Seal with dry addition of Crumb Rubber (SSCR) and a Photocatalytic cement Mortar (PM), obtaining five different materials to be tested. In this paper the Authors present preliminary results, analyzing the acoustic characterization of the selected materials in terms of absorption coefficient. Moreover, in situ noise measurements have also been repeated at different stages in order to find possible correlations with acoustic properties of the mixes and to investigate the time dependency of the performance.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52178

Valutazione sperimentale dell’efficacia disinquinante di pavimentazioni fotocatalitiche
LE STRADE
Autore/i: Santagata, Felice Ausilio; Bocci, Maurizio; Canestrari, Francesco; Pasquini, Emiliano
Classificazione: 1 Contributo su Rivista
Abstract: I LIVELLI DI INQUINAMENTO ATMOSFERICO NELLE AREE URBANE HANNO STIMOLATO LA RICERCA DI NUOVE TECNOLOGIE CAPACI DI MITIGARE LA CONCENTRAZIONE DI SOSTANZE NOCIVE LUNGO LE ARTERIE STRADALI, ALLO SCOPO DI RENDERE LE CITTÀ PIÙ VIVIBILI. A TALE PROPOSITO ESISTONO ALCUNI MATERIALI A BASE DI BIOSSIDO DI TITANIO (TiO2), FACILMENTE APPLICABILI SU DIVERSE SUPERFICI, CHE IN PRESENZA DI LUCE ED ARIA SONO CAPACI DI TRASFORMARE LE SOSTANZE INQUINANTI PRESENTI IN ATMOSFERA IN COMPOSTI INNOCUI PER EFFETTO DI UN PROCESSO DI FOTOCATALISI. GLI AUTORI HANNO INSERITO LO STUDIO DI DUE PRODOTTI A BASE DI TiO2 ALL’INTERNO DI UN PROGETTO PILOTA NAZIONALE RIGUARDANTE MATERIALI STRADALI INNOVATIVI ECOSOSTENIBILI. IL PROGETTO HA PREVISTO LA REALIZZAZIONE DI UNA STESA SPERIMENTALE IN UN TRATTO DI STRADA STATALE URBANA AD ELEVATO TRAFFICO ALLO SCOPO DI VALUTARE IN SITO, MEDIANTE CENTRALINE AMBIENTALI, ED IN LABORATORIO, SULLA BASE DI PROTOCOLLI DI PROVA ORIGINALI, LE PROPRIETÀ DISINQUINANTI DEI TRATTAMENTI OGGETTO DI STUDIO.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31458

Asphalt Rubber: primeiros resultados em Itália
Estrada 2008 V Congresso Rodoviario Portugues
Autore/i: Santagata, Felice Ausilio; Antunes, I; Canestrari, Francesco; Pasquini, Emiliano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50505

Characterization of Water Sensitivity of Asphalt Mixtures with Coaxial Shear Test
ROAD MATERIALS AND PAVEMENT DESIGN
Autore/i: Partl, M. N.; Canestrari, Francesco; Grilli, Andrea; Gubler, R.
Classificazione: 1 Contributo su Rivista
Abstract: The CoAxial Shear Test (CAST) performs fatigue test under simultaneous action of dynamic loading, temperature cycles and water, and modulus test on wet or dry specimen. Both a dense graded and an open graded mixture were studied at different air void content. The water sensitivity of both mixtures was determined by comparing fatigue performance of dry and wet tests. Additionally, the effects of water action, temperature and loading cycles were also investigated by comparison of modulus test before (undamaged specimen) and after (damaged specimen) each fatigue test. The introduced Water Sensitivity Index for fatigue test confirms that water damage in asphalt pavements is considerably related to air voids. Finally, the modulus test analysis allowed explaining also the different consequences of environmental factors on viscoelastic properties of asphalt mixtures by using the Standard Linear Solid model. © 2008 Lavoisier.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31456

Layer Characteristics Affecting Interlayer Shear Resistance in Flexible Pavements
JOURNAL OF THE ASSOCIATION OF ASPHALT PAVING TECHNOLOGISTS
Autore/i: Santagata, Felice Ausilio; Parti, M. N.; Ferrotti, Gilda; Canestrari, Francesco; Flisch, A.
Classificazione: 1 Contributo su Rivista
Abstract: The evaluation of interlayer shear resistance is important to better understand how multi-layered pavements behave under traffic conditions. This paper focuses on the characterization of the interlayer shear behavior in flexible pavements through experimental investigation and analysis of two parameters that affect interlayer bonding: the influence of air void content of the two mixes in contact and the contact surface roughness of double-layered asphalt concrete specimens. Two different shear test devices (LPDS and ASTRA equipments) were used to evaluate interlayer resistance, whereas air void content and roughness characteristics at the interface were measured by using both traditional and innovative techniques. In particular, a non-destructive method, the X-ray Computer Tomography (CT), was used to investigate interlayer air void content and interlayer roughness after compaction of the upper layer. The results were able to show that air void content influences interlayer shear resistance in a non-linear way. As far as contact surface roughness is concerned, profile comb, laser profilometer and X-ray CT were used and further elaborated with advanced techniques such as fractal theory and spectral analysis. The results showed how higher macro-texture leads to an increase in LPDS and ASTRA interlayer shear resistance.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31455

Experimental characterization of transparent synthetic binder mixes reinforced with cellulose fibres
4th International SIIV congress
Autore/i: F. A., Santagata; Canestrari, Francesco; Ferrotti, Gilda; Graziani, Andrea
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The use of synthetic binders in wearing course mixes allows to integrate road pavements into urban surroundings. In fact, the mixes prepared with this binder mitigate the visual impact that common asphalt materials produce, allowing a pavement coloration depending on the aggregate dyes to be obtained. In this paper, the characterization of open graded mixes prepared with a synthetic binder, reinforced or not with cellulose fibres, was performed. In particular, nine mixes, with different binder and cellulose fibre contents, were investigated through several laboratory tests to find the ‘optimum’ mix in terms of both mechanical performance and durability. The study of all mixes was performed in two steps. In the first step, traditional tests were carried out: Marshall, Indirect Tensile and Cantabro tests. Moreover, to investigate the water effect on these open graded mixes, the traditional tests were also performed on specimens immersed in water for 15 days, and the results were compared. In the second step, the same nine mixes were investigated in terms of rutting behaviour by using Wheel Tracker Machine, and stiffness modulus and fatigue strength through Nottingham Asphalt Tester (NAT). Finally, the comparison with a traditional open graded mix (with SBS hard bitumen) was performed showing higher laboratory performance for the synthetic binder mix. This paper shows that specific synthetic binder and cellulose fibre contents provide an ‘optimum’ open graded mix.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52988

Mechanical characterization of asphalt rubber – wet process
4° International SIIV Congress
Autore/i: Santagata, Felice Ausilio; Canestrari, Francesco; Pasquini, Emiliano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In many countries all over the world, bitumen modified with crumb rubber from ground tires is widely and successfully used, as binder in hot mix asphalt (HMA). Asphalt Rubber is commonly used as wearing course for HMA pavements in order to improve smoothness and skid resistance and to reduce cracking and traffic noise. As extra benefit, this bituminous mixture allows to recycle rubber from waste tires. In Italy, to date, this kind of mixture is not employed yet, except for some isolated situations, in spite of the encouraging results obtained all over the world. This paper focuses on the mechanical characterization of a wet process asphalt rubber. This material was taken from the first experimental pavement section in Italy and then analyzed in laboratory. For this evaluation, Asphalt Rubber was subjected to dynamic Indirect Tensile Stiffness Modulus test (ITSM), Indirect Tensile Fatigue Test (ITFT), Repeated Loading Axial Test (RLAT) and Wheel Tracking Test (WTT). For a better evaluation, the results obtained for ARFC were compared with those obtained with different mixes subjected to the same tests. In particular, two HMA mixes manufactured in laboratory with the same gradation curve and bitumen content of Asphalt Rubber (the first with a traditional pen70/100 binder and the second with a SBS modified binder), a SplittMastixAsphalt and a dense graded HMA with expanded clay taken from a plant mix, were used. Results clearly showed that the use of Asphalt Rubber can noticeably improve the mechanical properties of asphalt mixtures suggesting potential advantageous applications also for the Italian road network.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52233

“Pavimentazioni innovative: progetto pilota ANAS-CIRS”,
LE STRADE
Autore/i: Canestrari, Francesco
Editore: Milano: Casa editrice la fiaccola srl I 20123 Milano precedente: Milan: Touring Club Italiano Soci http://www.touringclub.it/,
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31304

Mechanical characterization of environmentally friendly mixtures
Advanced Characterisation of Pavement and Soil Engineering Materials
Autore/i: Bocci, Maurizio; Canestrari, Francesco; Ferrotti, Gilda; Pasquini, Emiliano
Editore: A. Loizos, T. Scarpas, I: Al-Qadi
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Nowadays, road traffic is the main cause of urban pollution. Owing to the primary importance of this problem two different environmentally friendly mixtures were considered: the first to reduce traffic noise and the second to mitigate atmospheric pollution. The anti-noise mixture is a dense-graded HMA in which 27% volume of mineral aggregates was replaced with expanded clay. The second mixture, which should mitigate air pollution, is an open-graded asphalt concrete partially filled with a cement mortar containing a photocatalytic agent (titanium dioxide). In order to properly use these mixes for road applications the evaluation of specific mechanical performance is required. In particular, the Authors show the laboratory characterization of the mixtures in terms of stiffness modulus, fatigue life and rutting comparing them with dense-graded and open-graded wearing courses, respectively.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53843

Verifica prestazionale di materiali impiegati per la realizzazione di segnaletiche orizzontali
16° CONVEGNO NAZIONALE SIIV
Autore/i: F., Santagata; Canestrari, Francesco; Ferrotti, Gilda
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Road marking functional retraining is a maintenance operation that more and more often involves road pavement management. These maintenance operations, extended to the whole road network, become very expensive both for direct costs and for indirect costs due to traffic slowing down. Road marking noticeably influences road safety. On the subject, some studies show that the decrease of accident risk is strongly connected with typical road marking characteristics as right visibility (day-time and night-time), suitable adhesion level and durability compatible with road network management. The Standard UNI EN 1436/98, according to the provisions of the Italian Road Code, fixes the principles to control road marking performances through the service life concept. It mainly depends on the frequency of vehicular passing, on the traffic variety, on the pavement characteristics and on the particular climatic conditions. However, it ignores engineering aspects tightly connected with the material life. In this sense, the above-mentioned Italian Road Code and the relative Regulations underline the need to characterize road marking as a material and not only as a “furniture”. The present work shows the results of an experimental study carried out on a trial section. The characteristics of 6 different materials (3 solvent paints and 3 waterborne paints) were studied to evaluate both photometrical and adhesion properties employing the Standard provisions. Through direct comparisons and periodic monitoring, it has been possible to estimate, on two different pavement surfaces, the material life and the effects of environmental conditions on required performances.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53832

Interlayer Shear Effects of Grid Reinforcements
10th INTERNATINAL CONFERENCE ON ASPHALT PAVEMENTS
Autore/i: Canestrari, Francesco; A., Grilli; F. A., Santagata; Virgili, Amedeo
Editore: International Society for Asphalt Pavements
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: It is well known that cracking in asphalt pavements and its related degradation processes can be caused by traffic loading and temperature variations. Moreover, the increasing traffic, higher axle loads and reduced road maintenance budget, force engineers to seek alternative materials and/or working methods for the design and rehabilitation of asphalt pavements. In this context there is an increasing interest in the use of reinforcement systems to provide higher durability of asphalt pavements. In fact, they could extend service life preventing pavement cracking with a reduction in maintenance costs. In order to improve our knowledge of pavement reinforcement applications, the present study focuses on the analysis of bonding at the interface between asphalt concrete layers and reinforcements. In fact, geosynthetics could not act as a reinforcement product if they are a cause of separation between the layers at the interface. The aim of this study concerns a better understanding of reinforcement systems behaviour and their effects on mechanical properties of the interface. To this purpose the interlayer direct shear test ASTRA (Ancona Shear Testing Research and Analysis) is used to provide more details regarding the comprehension of the interlayer shear resistance. In particular, this paper presents the results obtained using four types of reinforcements at the interface, with both conventional and porous wearing course for the upper layer of laboratory samples. Our experimental program considers the effects of various test parameters, among which temperature and normal stress, in order to investigate the influence of the reinforcement properties (stiffness, geometry, size, coating, etc.) on the interlayer shear strength and stiffness.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52326

Influence of contact surface roughness on interlayer shear resistance
Proceedings, 10th International Conference On Asphalt Pavements ISAP
Autore/i: Partl, M. N.; Canestrari, Francesco; Ferrotti, Gilda; Santagata, F. A.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Regarding performance of multi-layered asphalt pavement systems, interlayer bonding has an important role because it considerably influences stress and strain distribution in the pavement. Interlayer shear resistance may depend on various factors such as type and presence of tack-coat, maximum aggregate size and air void content of the two mixes in contact, as well as roughness conditions at the interface. This study, which is part of an ongoing research project, focuses primarily on the possible relationship between interlayer shear resistance and lower layer surface roughness of double-layered asphalt concrete specimens. In addition, the study deals with the comparison of different methods to evaluate this contact surface roughness. Before placing the upper layer, two different methods were applied to determine surface profiles: a laser profilometer and a profile comb. The obtained profiles were used to perform MPD (Mean Profile Depth) and fractal dimension evaluations. Moreover, the lower layer surface roughness was evaluated with the traditional sand patch method. Each technique was used to seek a relationship between the contact surface roughness and the interlayer shear resistance measured by both ASTRA (Ancona Shear Testing Research and Analysis) test device and LPDS (Layer-Parallel Direct Shear) test device. The results show that greater contact surface roughness leads to an increase in ASTRA and LPDS interlayer shear resistance in different proportions for MPD, fractal dimension and sand patch method roughness evaluation.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53838

“Caratterizzazione acustica di un asfalto fonoassorbente con argilla espansa”,
32° Convegno Nazionale Associazione Italiana di Acustica
Autore/i: Canestrari, Francesco; Iannotti, A.; Mattei, E.; Serpilli, F.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43950

Repeatability of Interlayer Shear Resistance determined With Two Test Procedure
Convegno Internazionale SIIV, Bari 2005
Autore/i: Canestrari, Francesco; Ferrotti, Gilda; Partl, M; Santagata, F. A.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Interlayer bonding significantly influences the performance of multi-layered pavement systems. To correctly know how this bonding modifies the interlayer mechanical performance, theoretical and experimental projects are currently in progress in many countries. However, different equipments generally provide different results because these results are obtained under different test conditions in terms of applied stress and strain, rate of displacement, specimen size and specimen confinement. Since in European Standards there is a normative gap regarding interlayer resistance tests, in Italy a draft of a standard is currently under development based on a laboratory direct shear device called ASTRA (Ancona Shear Testing Research and Analysis). In the present paper, the repeatability of ASTRA test method is studied by analyzing the results obtained in two experimental investigations. In the first investigation, specimens prepared with the same material and the same compactor were tested with ASTRA test method and with another shear test method, the LPDS (Layer-Parallel Direct Shear), which is compatible with Swiss Standards (Schweizer Norm SN 671961, 2000). In the second investigation, the first series of ASTRA results were compared with repeatability results obtained by using different materials and different compaction methods for the double-layered specimens. The study shows that the two shear test equipments provide the same precision level in terms of scatter of the results. Moreover, the ASTRA investigation shows that the repeatability depends not only on the test method but also on the pavement material and compaction method. This study allows supporting Italian standardization of interlayer shear resistance testing and, at the same time, it shows that it is necessary to further investigate different materials and different compaction methods to improve the knowledge on repeatability.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43896

“RILEM: L’Annual Meeting 2005 di Ancona”
RASSEGNA DEL BITUME
Autore/i: Canestrari, Francesco; M. N., Partl
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31305

Advanced testing and characterization of interlayer shear resistance
TRANSPORTATION RESEARCH RECORD
Autore/i: Canestrari, Francesco; Ferrotti, Gilda; M., Partl; E., Santagata
Classificazione: 1 Contributo su Rivista
Abstract: The performance of multi-layered pavement systems strongly depends on interlayer bonding. Thus, to guarantee good bonding, during pavement construction or overlay, tack coats (also indicated as bond coats) are usually applied at the various interfaces. The effectiveness of the tack coat can be assessed by making use of several devices which are arranged by different laboratories to evaluate interlayer shear resistance. The paper shows how interlayer shear resistance may be evaluated through ASTRA device. The ASTRA results, expressed in terms of maximum interlayer shear stress (peak), highlight the effects of various influence parameters such as type of interface treatment, curing time, procedure of specimen preparation, temperature, applied normal load. Moreover, the paper compares the peak results obtained by two different shear test devices: the ASTRA tester designed and developed in the Università Politecnica delle Marche (Italy) and the LPDS tester created by EMPA (Swiss Federal Laboratories for Materials Testing and Research). Both test methods provide different but comparable results showing the same ranking of shear resistance for different interface treatments.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31303

Influence of water and temperature on mechanical properties of selected asphalt pavements
MATERIALS AND STRUCTURES
Autore/i: Gubler, R.; Partl, M. N.; Canestrari, Francesco; Grilli, Andrea
Classificazione: 1 Contributo su Rivista
Abstract: One of the main causes of distress in asphalt pavements is water damage. The purpose of this paper is to compare different test methods to evaluate moisture susceptibility. This is of special importance because of the insufficient effectiveness of the procedures currently used. In this research experiments were conducted to investigate the effects of water and temperature on mechanical properties of mixtures with different air voids content. The evaluation of such properties concentrates on the following three approaches: innovative (Coaxial Shear Test), traditional (Indirect Tensile Test) and empirical (Cantabro Test). Specimens were prepared by means of Superpave Gyratory Compactor (SGC) and divided in two different subset for controlled dry and wet conditioned testing. Test results indicated that Indirect Tensile Test (IDT) is not able to discriminate between wet and dry condition as the Coaxial Shear Test (CAST) does. The CAST method reproduces closest the real field conditions and indicates clearly the risk of water damage for open graded mixtures (high air voids content). Dense graded mixtures (low air voids content) showed less influence probably due to the reduced amount of penetrating water. Cantabro Tests (CAT) provided also significant results in good correlation with air voids content and material properties of asphalt mixes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31077

Temperature effects on the shear behaviour of tack coat emulsions used in flexible pavements
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
Autore/i: Canestrari, Francesco; E., Santagata
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31076

Caratterizzazione dei bitumi stradali alle basse temperature con il Direct Tension Device
STRADE & AUTOSTRADE
Autore/i: Canestrari, Francesco; Cardone, Fabrizio; E., Santagata; F. A., Santagata; Virgili, Amedeo
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51346

Comportamento reologico di leganti sintetici per arredi urbani e miscele stradali
STRADE & AUTOSTRADE
Autore/i: Canestrari, Francesco; G., Cerni
Editore: EDI-CEM, Milano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31075

Suitability of SHRP test methods for european bitumens
HELSINKI UNIVERSITY OF TECHNOLOGY HIGHWAY ENGINEERING, ESPOO 2003 TKK – A54
Autore/i: Canestrari, Francesco; T., Blomberg; F., Capanelli; F., Giuliani; O. P., Hartikainen; T., Karkkainen; M., Levomaki; M., Reihe; E., Santagata; F. A., Santagata; J., Valtonen
Classificazione: 5 Altro
Abstract: ISBN 951-22-6475-7 ISSN 1456-4505
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/49518

Formulazione generale dei raccordi plano-altimetrici definiti sulla base del comportamento dell’utente
Atti del XII Convegno Internazionale SIIV
Autore/i: Canestrari, Francesco; Graziani, Andrea; Virgili, Amedeo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: SIIV - XII Convegno Internazionale: Riqualificazione funzionale e sicurezza del sistema viario. Universita' degli studi di Parma
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53399

Performance-related evaluation of slurry surfacings by means of the ASTRA test method
3rd INTERNATIONAL CONFERENCE BITUMINOUS MIXTURES AND PAVEMENTS
Autore/i: Canestrari, Francesco; E., Santagata; F. A., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: THESSALONIKI - GREECE
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53326

Influenza della geometria e forma degli aggregati sulle proprieta' volumetriche di conglomerati bituminosi chiusi ed aperti
CONVEGNO SIIV - Parma
Autore/i: Canestrari, Francesco; F., Giuliani; E., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43892

Trattamenti superficiali e trattamenti con malte bituminose a freddo
STRADE & AUTOSTRADE
Autore/i: Canestrari, Francesco
Editore: EDI-CEM, Milano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31074

Norma per la determinazione delle proprietà a taglio di interfacce bituminose
CONVEGNO NAZIONALE SIIV
Autore/i: Canestrari, Francesco; E., Santagata; F. A., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53333

Criteri di progetto e controllo dei trattamenti superficiali
CONVEGNO SIIV - Verona
Autore/i: Canestrari, Francesco
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43711

Relazione tra proprietà geometriche e vuoti finali nelle miscele non legate di aggregati lapidei
CONVEGNO SIIV - Catania
Autore/i: Canestrari, Francesco; F., Giuliani; A., Montepara
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43891

Design of prime coats based on the theory of percolation
SYMPOSIUM ON PERFORMANCE AND DURABILITY OF BITUMINOUS MATERIALS AND HYDRAULIC STABILISED COMPOSITES
Autore/i: Canestrari, Francesco
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Leeds
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43887

Fondamenti di teoria della percolazione per l’impregnazione di misti granulari
CONVEGNO SIIV - Milano
Autore/i: Canestrari, Francesco
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43890

Indagine sperimentale sulla reologia dei mastici bituminosi
XXIII CONVEGNO NAZIONALE STRADALE AIPCR - Verona
Autore/i: Canestrari, Francesco; F., Giuliani; E., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43713

A new laboratory test to evaluate the shear resistance at the interface of thin bonded overlays
8TH INTERNATIONAL SYMPOSIUM ON CONCRETE ROADS - Lisbona
Autore/i: Canestrari, Francesco; M. C., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43889

Studio della ripetibilità della prova prestazionale ASTRA sui trattamenti superficiali di irruvidimento
CONVEGNO SIIV - Pisa
Autore/i: Canestrari, Francesco; E., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43712

Influence of the old pavement surface conditions on the effectiveness of tack coat emulsions
II CONGRESSO MONDIALE DELL'EMULSIONE - Bordeaux
Autore/i: Canestrari, Francesco; Bocci, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43660

Monitoraggio tecnico-economico dei trattamenti superficiali di depolverizzazione
CONVEGNO SIIV - Pisa
Autore/i: Canestrari, Francesco
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43888

Caratterizzazione reologica di bitumi invecchiati con radiazioni UV
III0 CONVEGNO NAZIONALE DEL PFT2
Autore/i: Canestrari, Francesco; F. A., Santagata; A., Montepara
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Taormina, Novembre
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53788

Prime penetration depth of emulsions related to compaction, aggregate size and water content of granular bases
II CONGRESSO MONDIALE DELL'EMULSIONE - Bordeaux
Autore/i: Canestrari, Francesco; F., Giuliani
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43710

Laboratory Performance-based Design of Surface Dressing
1ST EURASPHALT-EUROBITUME CONGRESS - Strasbourg
Autore/i: F., Santagata; Canestrari, Francesco; E., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53540

Caratterizzazione a taglio nei rinforzi sottili per le pavimentazioni aeroportuali in calcestruzzo
LE STRADE
Autore/i: Canestrari, Francesco
Editore: Milano: Casa editrice la fiaccola srl I 20123 Milano precedente: Milan: Touring Club Italiano Soci http://www.touringclub.it/,
Classificazione: 1 Contributo su Rivista
Abstract: Supplemento alla rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31073

Caratterizzazione prestazionale dei trattamenti superficiali
CONVEGNO SIIV - Ancona
Autore/i: Canestrari, Francesco; E., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43658

Infuenza del filler sul comportamento reologico dei mastici. Analisi comparativa con il Bending Beam Rheometer
CONVEGNO SIIV - Ancona
Autore/i: Canestrari, Francesco; F., Giuliani; E., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43659

Progetto e controllo delle caratteristiche di aderenza mediante la teoria dei frattali
LE STRADE
Autore/i: Canestrari, Francesco; Virgili, Amedeo
Editore: Milano: Casa editrice la fiaccola srl I 20123 Milano precedente: Milan: Touring Club Italiano Soci http://www.touringclub.it/,
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31072

Tensile and shear tests of interfaces in asphalt mixes: a new perspective on their failure criteria
INTERNATIONAL SYMPOSIUM AT THE UNIVERSITY OF ULSTER
Autore/i: Canestrari, Francesco; E., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43656

Analisi sperimentale e modelli teorici per lo studio del comportamento a taglio delle interfacce nei sistemi bituminosi multistrato
LE STRADE
Autore/i: Canestrari, Francesco; E., Santagata
Editore: Milano: Casa editrice la fiaccola srl I 20123 Milano precedente: Milan: Touring Club Italiano Soci http://www.touringclub.it/,
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31071

Laboratory shear testing of tack coat emulsions
I CONGRESSO MONDIALE DELL'EMULSIONE - Parigi
Autore/i: Canestrari, Francesco; F. A., Santagata; E., Santagata
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43655

La dimensione frattale applicata allo studio della rugosità superficiale nelle pavimentazioni stradali
LE STRADE
Autore/i: Canestrari, Francesco
Editore: Milano: Casa editrice la fiaccola srl I 20123 Milano precedente: Milan: Touring Club Italiano Soci http://www.touringclub.it/,
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31297

Stress-dilatancy and strength of Ancona clay
INTERNATIONAL SYMPOSIUM ON HARD SOILS AND SOFT ROCKS - Atene
Autore/i: Canestrari, Francesco; Scarpelli, Giuseppe
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Athens, Eds. Anagnostopulos et al. Balkema.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50294

Un parametro di stato anche per le argille
CONVEGNO DEL GRUPPO NAZIONALE DI COORDINAMENTO PER GLI STUDI DI INGEGNERIA GEOTECNICA - CNR
Autore/i: Canestrari, Francesco; Scarpelli, Giuseppe
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Roma
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52327