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The paper presents a report that discuss the experience of participation of the authors in the EduHack, an online course designed to train university teachers in the use of digital techniques and learning strategies. This study highlights two issues of great interest in pandemic times. The first one is the structure and the organization of the EduHack course with some suggestions related to its improvement; the second one is Drag&Fly, the project idea of an e-learning web platform developed by the authors during the collaborative part of the course. The experience of participation to EduHack course has been analyzed by authors using concepts and categories of analysis widespread in the pragmatic theoretical tradition, enhancing the possibility of changing the teachers’ approach to the design and the implementation of a higher education e-learning course.
Fabrizio Barpi; Davide Dalmazzo; Antonella De Blasio; Fiorella Vinci. Hacking Higher Education: Rethinking the EduHack Course. Education Sciences 2021, 11, 40 .
AMA StyleFabrizio Barpi, Davide Dalmazzo, Antonella De Blasio, Fiorella Vinci. Hacking Higher Education: Rethinking the EduHack Course. Education Sciences. 2021; 11 (2):40.
Chicago/Turabian StyleFabrizio Barpi; Davide Dalmazzo; Antonella De Blasio; Fiorella Vinci. 2021. "Hacking Higher Education: Rethinking the EduHack Course." Education Sciences 11, no. 2: 40.
This paper presents the results of an experimental investigation that focused on the failure properties of asphalt binders at low temperatures. A novel test method was developed, based on the use of the dynamic shear rheometer equipped with 4 mm parallel plates. The method entails the application of constant shear strain rates at various temperatures until failure. Test data are modelled by means of the elastic-viscoelastic correspondence principle and by thereafter referring to the shear stress at failure, to a purposely defined brittleness index and to a critical brittleness temperature. Results discussed in the paper, which refer to a preliminary set of experimental data, indicate that the proposed methodology may be very effective in evaluating and comparing low temperature failure properties of asphalt binders of various types and origins.
Orazio Baglieri; Chiara Tozzi; Davide Dalmazzo; Lucia Tsantilis; Ezio Santagata. A novel methodology for the evaluation of low temperature failure properties of asphalt binders. Materials and Structures 2021, 54, 1 -13.
AMA StyleOrazio Baglieri, Chiara Tozzi, Davide Dalmazzo, Lucia Tsantilis, Ezio Santagata. A novel methodology for the evaluation of low temperature failure properties of asphalt binders. Materials and Structures. 2021; 54 (1):1-13.
Chicago/Turabian StyleOrazio Baglieri; Chiara Tozzi; Davide Dalmazzo; Lucia Tsantilis; Ezio Santagata. 2021. "A novel methodology for the evaluation of low temperature failure properties of asphalt binders." Materials and Structures 54, no. 1: 1-13.
The study described in this paper focused on the possible use of waste products coming from the production of styrene–butadiene rubber (SBR) and polybutadiene rubber (PBR), as bitumen modifiers. Modified binders containing these products were prepared in the laboratory with different polymer dosages and were thereafter subjected to the evaluation of empirical and rheological properties. For comparative purposes, the study also considered SBR and PBR products of premium quality. Ageing effects were also taken into account by means of proper laboratory simulations. Obtained results indicated that the two types of polymer (SBR and PBR) have completely different effects on the rheology and expected performance of the resulting modified binders. In particular, while the two polymers showed similar effects in terms of resistance to permanent deformation, the SBR products proved to be superior from the viewpoint of fatigue resistance. However, only minor differences were found when comparing the effects produced by premium quality and waste polymers. As a result of the experimental findings, it was concluded that the use of waste SBR polymers can be an attractive solution for the production of affordable modified binders.
Sadegh Yeganeh; Mahmoud Ameri; Davide Dalmazzo; Ezio Santagata. Experimental Investigation on the Use of Waste Elastomeric Polymers for Bitumen Modification. Applied Sciences 2020, 10, 2671 .
AMA StyleSadegh Yeganeh, Mahmoud Ameri, Davide Dalmazzo, Ezio Santagata. Experimental Investigation on the Use of Waste Elastomeric Polymers for Bitumen Modification. Applied Sciences. 2020; 10 (8):2671.
Chicago/Turabian StyleSadegh Yeganeh; Mahmoud Ameri; Davide Dalmazzo; Ezio Santagata. 2020. "Experimental Investigation on the Use of Waste Elastomeric Polymers for Bitumen Modification." Applied Sciences 10, no. 8: 2671.
The work presented in this paper focused on the rheological properties of ternary composites for paving applications constituted by bitumen, nano-sized additives and polymer modifiers. Non-functionalized multiwall carbon nanotubes and two types of styrene-butadienestyrene polymers, linear and radial, were used to modify a reference neat bitumen with the specific goal of highlighting the effects of polymer structure on the final properties of composites. Binary blends containing a single additive were also investigated for comparative purposes. Materials were characterized by means of dynamic mechanical analysis and their internal structure was assessed with fluorescence microscopy observations. Experimental outcomes indicated that polymer architecture played a crucial role in promoting effective interactions between modifiers and carbon nanotubes. Specifically, in the presence of linear styrene-butadienestyrene, carbon nanotubes acted as compatibility activators, leading to the formation of stable and continuous ternary systems. On the contrary, in the case of radial styrene-butadienestyrene, beneficial effects provided by nano-modification were jeopardized by the increased thermodynamic instability which resulted from the combined use of these two components.
Lucia Tsantilis; Davide Dalmazzo; Orazio Baglieri; Ezio Santagata. Effect of SBS molecular structure on the rheological properties of ternary nanomodified bituminous binders. Construction and Building Materials 2019, 222, 183 -192.
AMA StyleLucia Tsantilis, Davide Dalmazzo, Orazio Baglieri, Ezio Santagata. Effect of SBS molecular structure on the rheological properties of ternary nanomodified bituminous binders. Construction and Building Materials. 2019; 222 ():183-192.
Chicago/Turabian StyleLucia Tsantilis; Davide Dalmazzo; Orazio Baglieri; Ezio Santagata. 2019. "Effect of SBS molecular structure on the rheological properties of ternary nanomodified bituminous binders." Construction and Building Materials 222, no. : 183-192.
This paper presents some of the results obtained in a research project focused on the use of paint sludge (PS) as a modifying agent in the production of bituminous binders for paving applications. The scope of the project was to provide an innovative, sustainable and profitable solution to waste management problems which automotive industries have to face worldwide as a result of the production of PS. The authors applied for a patent which defines the industrial process for the production of PS modified binders (PSMBs). Measurements and analyses which were considered relevant for the assessment of technological feasibility included evaluation of: PS physical characteristics, PSMB high-temperature viscosity and PSMB storage stability. Environmental issues were addressed by considering PS chemical composition, gaseous emissions during PSMB production, and leaching behavior of bituminous mixtures containing PSMBs. Obtained results show that with a proper adaptation of the PSMB production process (i.e., PS drying at a higher temperature than 105°C) it is possible to comply with technological and environmental requirements such as those related to storage stability and to gaseous emissions during PSMB production and laying of bituminous mixtures. Leaching tests, aimed to evaluate runoff water quality, show no substantial difference in the release of substances in water between standard bituminous mixtures and bituminous mixtures prepared with PSMBs.
Maria Chiara Zanetti; Barbara Ruffino; Arianna Vercelli; Davide Dalmazzo; Ezio Santagata. Reuse of paint sludge in road pavements: Technological and environmental issues. Waste Management & Research: The Journal for a Sustainable Circular Economy 2018, 36, 1023 -1028.
AMA StyleMaria Chiara Zanetti, Barbara Ruffino, Arianna Vercelli, Davide Dalmazzo, Ezio Santagata. Reuse of paint sludge in road pavements: Technological and environmental issues. Waste Management & Research: The Journal for a Sustainable Circular Economy. 2018; 36 (11):1023-1028.
Chicago/Turabian StyleMaria Chiara Zanetti; Barbara Ruffino; Arianna Vercelli; Davide Dalmazzo; Ezio Santagata. 2018. "Reuse of paint sludge in road pavements: Technological and environmental issues." Waste Management & Research: The Journal for a Sustainable Circular Economy 36, no. 11: 1023-1028.
The study focused on two new laboratory procedures developed for the determination of crumb rubber content of asphalt rubber binders. The first methodology was on the basis of the comparative analysis of cobalt and antimony content of base bitumen, crumb rubber, and asphalt rubber. The second was on the basis of the analysis of combustion products of asphalt rubber binders and of their components. Investigations were performed on binders prepared in the laboratory or sampled at production plants during pavement rehabilitation works. Obtained results were encouraging because it was found that both procedures were characterized by satisfactory levels of accuracy and precision.
Maria Chiara Zanetti; Barbara Ruffino; Davide Dalmazzo; Michele Lanotte; Ezio Santagata. Determination of Crumb Rubber Content of Asphalt Rubber Binders. Journal of Materials in Civil Engineering 2018, 30, 04018041 .
AMA StyleMaria Chiara Zanetti, Barbara Ruffino, Davide Dalmazzo, Michele Lanotte, Ezio Santagata. Determination of Crumb Rubber Content of Asphalt Rubber Binders. Journal of Materials in Civil Engineering. 2018; 30 (4):04018041.
Chicago/Turabian StyleMaria Chiara Zanetti; Barbara Ruffino; Davide Dalmazzo; Michele Lanotte; Ezio Santagata. 2018. "Determination of Crumb Rubber Content of Asphalt Rubber Binders." Journal of Materials in Civil Engineering 30, no. 4: 04018041.
The paper reports the results of an experimental investigation in which the cohesive healing properties of different types of asphalt binder were evaluated by means of the dissipated energy ratio approach. A specifically designed testing methodology was proposed which involves comparing the response of binders subjected to continuous oscillatory shear loading carried out without rest periods and with single rest periods introduced at predefined levels of damage A rheological parameter (Healing Ratio) was introduced to quantify the magnitude of healing occurring during rest time and to rank the consequent healing potential of binders. Obtained results indicate that the investigated binders did not completely recover their original fatigue resistance after rest time, confirming the existence of some intrinsic irreversible damage, the amount of which depends on the total damage experienced before load removal. Experimental results also indicate that healing performance of binders can be significantly enhanced by polymer modificatio
Ezio Santagata; Orazio Baglieri; Davide Dalmazzo; Lucia Tsantilis. Investigating cohesive healing of asphalt binders by means of a dissipated energy approach. International Journal of Pavement Research and Technology 2017, 10, 403 -409.
AMA StyleEzio Santagata, Orazio Baglieri, Davide Dalmazzo, Lucia Tsantilis. Investigating cohesive healing of asphalt binders by means of a dissipated energy approach. International Journal of Pavement Research and Technology. 2017; 10 (5):403-409.
Chicago/Turabian StyleEzio Santagata; Orazio Baglieri; Davide Dalmazzo; Lucia Tsantilis. 2017. "Investigating cohesive healing of asphalt binders by means of a dissipated energy approach." International Journal of Pavement Research and Technology 10, no. 5: 403-409.
This paper presents the outcomes of an experimental investigation which focused on the fatigue behavior of bituminous binder for paving applications prepared by
Davide Dalmazzo; Ezio Santagata; Lucia Tsantilis. Fatigue Characterization of Bituminous Binders Containing Crumb Rubber from End of Life Tires. Sixth International Conference on Advances in Civil, Structural and Mechanical Engineering - ACSM 2017 2017, 51 -56.
AMA StyleDavide Dalmazzo, Ezio Santagata, Lucia Tsantilis. Fatigue Characterization of Bituminous Binders Containing Crumb Rubber from End of Life Tires. Sixth International Conference on Advances in Civil, Structural and Mechanical Engineering - ACSM 2017. 2017; ():51-56.
Chicago/Turabian StyleDavide Dalmazzo; Ezio Santagata; Lucia Tsantilis. 2017. "Fatigue Characterization of Bituminous Binders Containing Crumb Rubber from End of Life Tires." Sixth International Conference on Advances in Civil, Structural and Mechanical Engineering - ACSM 2017 , no. : 51-56.
Application of paints by spraying, extensively used in the automotive industry, generates a solid waste, known as paint sludge, which, if improperly managed, may lead to significant environmental and economic burdens. In the research work described in this paper, use of paint sludge for the production of modified bituminous binders for paving applications was investigated. In particular, expected field performance of paint sludge modified binders (PSMBs) was assessed and compared to that of neat bitumen and polymer-modified binders. PSMBs considered in the study were prepared in the laboratory by employing variable dosages of sludge coming from different painting plants and derived either from basecoat or clearcoat application. PSMB characteristics were evaluated by means of rheological tests which led to construction of master curves, determination of performance grade (PG) according to the SUPERPAVE scheme, detailed evaluation of resistance to permanent deformation by means of multiple stress creep recovery tests, and analysis of resistance to fatigue damage by making use of time sweep and linear amplitude sweep tests. Obtained results showed that use of automotive paint sludge for the production of PSMBs is a feasible, cost-effective and environmentally compatible alternative to currently adopted management solutions which consist either in incineration or in energy production in cement kilns. Although fluxing and stiffening effects were observed in the case of basecoat and clearcoat sludge, respectively, only minor variations were recorded in terms of PG, elastic esponse, stress sensitivity, fatigue resistance and fatigue ductility of neat bitumen
Davide Dalmazzo; Arianna Vercelli; Ezio Santagata; Barbara Ruffino; Maria Chiara Zanetti. Rheological characterization and performance-related evaluation of paint sludge modified binders. Materials and Structures 2016, 50, 74 .
AMA StyleDavide Dalmazzo, Arianna Vercelli, Ezio Santagata, Barbara Ruffino, Maria Chiara Zanetti. Rheological characterization and performance-related evaluation of paint sludge modified binders. Materials and Structures. 2016; 50 (1):74.
Chicago/Turabian StyleDavide Dalmazzo; Arianna Vercelli; Ezio Santagata; Barbara Ruffino; Maria Chiara Zanetti. 2016. "Rheological characterization and performance-related evaluation of paint sludge modified binders." Materials and Structures 50, no. 1: 74.
Ezio Santagata; Orazio Baglieri; Lucia Tsantilis; Giuseppe Chiappinelli; Davide Dalmazzo. Bituminous-based nanocomposites with improved high-temperature properties. Composites Part B: Engineering 2016, 99, 9 -16.
AMA StyleEzio Santagata, Orazio Baglieri, Lucia Tsantilis, Giuseppe Chiappinelli, Davide Dalmazzo. Bituminous-based nanocomposites with improved high-temperature properties. Composites Part B: Engineering. 2016; 99 ():9-16.
Chicago/Turabian StyleEzio Santagata; Orazio Baglieri; Lucia Tsantilis; Giuseppe Chiappinelli; Davide Dalmazzo. 2016. "Bituminous-based nanocomposites with improved high-temperature properties." Composites Part B: Engineering 99, no. : 9-16.
When deviating from standard paving solutions, it is necessary to verify that the use of supplementary components or the adoption of different processing conditions do not lead for construction workers to an increase of the risk associated to fume exposure. In the specific case of bituminous materials containing crumb rubber from end-of-life tyres, such an issue was addressed in an investigation in which a new laboratory test procedure for the evaluation of the composition and of the potential hazardous effects of gaseous emissions released during paving operations was developed and validated. Experimental activities were carried out by considering six different asphalt rubber mixtures, the emissions of which were sampled both in the field and in the laboratory. Subsequent analyses were performed by evaluating concentrations of volatile organic compounds and polycyclic aromatic hydrocarbons and by calculating corresponding toxic and carcinogenic risk parameters by means of adequate models. Effects of material-specific and site-specific factors were clearly distinguished and in most cases it was observed that analyses derived from laboratory-generated emissions led to a conservative estimate of risk. In general terms it was therefore concluded that the proposed procedure may be extremely valuable for the assessment of the true emission potential of bituminous mixtures containing crumb rubber and that in the future it may be employed as an evaluation tool during the mix design and field monitoring phases.
Maria Chiara Zanetti; Ezio Santagata; Silvia Fiore; Barbara Ruffino; Davide Dalmazzo; Michele Antonio Lanotte. Evaluation of potential gaseous emissions of asphalt rubber bituminous mixtures. Proposal of a new laboratory test procedure. Construction and Building Materials 2016, 113, 870 -879.
AMA StyleMaria Chiara Zanetti, Ezio Santagata, Silvia Fiore, Barbara Ruffino, Davide Dalmazzo, Michele Antonio Lanotte. Evaluation of potential gaseous emissions of asphalt rubber bituminous mixtures. Proposal of a new laboratory test procedure. Construction and Building Materials. 2016; 113 ():870-879.
Chicago/Turabian StyleMaria Chiara Zanetti; Ezio Santagata; Silvia Fiore; Barbara Ruffino; Davide Dalmazzo; Michele Antonio Lanotte. 2016. "Evaluation of potential gaseous emissions of asphalt rubber bituminous mixtures. Proposal of a new laboratory test procedure." Construction and Building Materials 113, no. : 870-879.
The research work described in the paper focused on fatigue and healing properties of bituminous mastics reinforced with nano-sized additives. Commercially available multiwall carbon nanotubes (CNTs) and montmorillonite nanoclay (NC) were combined with a single base bitumen and a standard mineral filler to produce bituminous mastics. These blends were prepared in the laboratory by making use of a technique consisting in simple shear mixing followed by sonication. Fatigue behaviour of mastics under repeated loading was investigated by means of time sweeps performed in the strain-controlled mode at various amplitudes. Healing potential was assessed by adopting a testing protocol specifically conceived to discriminate between recovery of damage induced by fatigue loading and other artefact phenomena which may affect material response. All rheological measurements were carried out with a dynamic shear rheometer in the parallel plates geometry. Outcomes of the experimental investigation were found to be highly dependent on the nature of additive type, as a result of the key role played by interaction mechanisms that nano-particles can establish within the bituminous mastic.
Ezio Santagata; Orazio Baglieri; Lucia Tsantilis; Davide Dalmazzo; Giuseppe Chiappinelli. Fatigue and healing properties of bituminous mastics reinforced with nano-sized additives. Mechanics of Time-Dependent Materials 2016, 20, 367 -387.
AMA StyleEzio Santagata, Orazio Baglieri, Lucia Tsantilis, Davide Dalmazzo, Giuseppe Chiappinelli. Fatigue and healing properties of bituminous mastics reinforced with nano-sized additives. Mechanics of Time-Dependent Materials. 2016; 20 (3):367-387.
Chicago/Turabian StyleEzio Santagata; Orazio Baglieri; Lucia Tsantilis; Davide Dalmazzo; Giuseppe Chiappinelli. 2016. "Fatigue and healing properties of bituminous mastics reinforced with nano-sized additives." Mechanics of Time-Dependent Materials 20, no. 3: 367-387.
Crumb rubber (CR) derived from grinding of end-of-life tyres (ELTs) may be successfully used as a bitumen modifier or as a supplementary component in the production of bituminous mixtures employed for the construction and maintenance of road pavements. However, CRs deriving from different sources and processes yield effects on performance under traffic loading and on gaseous emissions produced during laying on site which may change considerably depending upon their physical and chemical properties. In order to quantitatively assess the possible variability of CR characteristics, a wide experimental program was set out in order to analyze samples taken from 14 Italian and 2 foreign ELT processing plants. Activities included field surveys, during which plants were examined in detail, and laboratory investigations, which focused on physical and chemical characterization of CR. Based on the analysis of available technical information and experimental data, it was possible to find relationships between the peculiar characteristics of treatment cycles and corresponding CR propertie
M.C. Zanetti; Silvia Fiore; Barbara Ruffino; Ezio Santagata; Davide Dalmazzo; Michele Antonio Lanotte. Characterization of crumb rubber from end-of-life tyres for paving applications. Waste Management 2015, 45, 161 -170.
AMA StyleM.C. Zanetti, Silvia Fiore, Barbara Ruffino, Ezio Santagata, Davide Dalmazzo, Michele Antonio Lanotte. Characterization of crumb rubber from end-of-life tyres for paving applications. Waste Management. 2015; 45 ():161-170.
Chicago/Turabian StyleM.C. Zanetti; Silvia Fiore; Barbara Ruffino; Ezio Santagata; Davide Dalmazzo; Michele Antonio Lanotte. 2015. "Characterization of crumb rubber from end-of-life tyres for paving applications." Waste Management 45, no. : 161-170.
Ezio Santagata; Orazio Baglieri; Davide Dalmazzo; Lucia Tsantilis. Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders. RILEM Bookseries 2015, 11, 631 -641.
AMA StyleEzio Santagata, Orazio Baglieri, Davide Dalmazzo, Lucia Tsantilis. Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders. RILEM Bookseries. 2015; 11 ():631-641.
Chicago/Turabian StyleEzio Santagata; Orazio Baglieri; Davide Dalmazzo; Lucia Tsantilis. 2015. "Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders." RILEM Bookseries 11, no. : 631-641.
Crumb rubber derived from end-of-life tires is nowadays considered as a valuable component to be employed for the production of high-performance bituminous binders and mixtures. Currently available technologies require such a material to be either pre-mixed with bitumen (“wet” method), with the consequent production of the so-called asphalt rubber binders, or to be added during the mixing of aggregates and bitumen (“dry” method), thereby leading to the preparation of rubberized dry mixtures. Depending upon the case, different interactions take place between bitumen and crumb rubber, resulting in mechanical properties of the final mixture which can increase its performance in the field under the effects of loading and environmental factors. The laboratory investigation presented in this paper focused on the issue of bitumen–crumb rubber affinity with the main purpose of developing a simple laboratory procedure which can be employed to support the formulation of rubberized dry mixtures. Affinity between bitumen and coarse crumb rubber, with particle sizes comprised between 1 and 4 mm, was evaluated by subjecting mortars of known composition to the volumetric expansion test (VET). Measured volumetric behavior was compared to that of reference blends prepared with the same base bitumen and inert silica sand. Obtained results were interpreted by taking into account phenomena which may occur during testing at bitumen-particle interfaces, allowing a quantitative comparison between crumb rubbers of different types. Moreover, an affinity parameter was defined, with the consequent possibility of assessing bitumen–crumb rubber affinity in absolute terms.
Ezio Santagata; Michele Lanotte; Orazio Baglieri; Davide Dalmazzo; Maria Chiara Zanetti. Analysis of bitumen–crumb rubber affinity for the formulation of rubberized dry mixtures. Materials and Structures 2015, 49, 1947 -1954.
AMA StyleEzio Santagata, Michele Lanotte, Orazio Baglieri, Davide Dalmazzo, Maria Chiara Zanetti. Analysis of bitumen–crumb rubber affinity for the formulation of rubberized dry mixtures. Materials and Structures. 2015; 49 (5):1947-1954.
Chicago/Turabian StyleEzio Santagata; Michele Lanotte; Orazio Baglieri; Davide Dalmazzo; Maria Chiara Zanetti. 2015. "Analysis of bitumen–crumb rubber affinity for the formulation of rubberized dry mixtures." Materials and Structures 49, no. 5: 1947-1954.
Asphalt binders play an important role in the rutting performance of road pavements, and therefore their characterisation is crucial in preventing this type of distress. Several studies have been carried out to replace the G*/sin δ Superpave criteria which were found to be inadequate to capture the anti-rutting potential of these materials. In this paper, a novel testing procedure combining single creep-recovery and multiple stress creep (MSC) tests is proposed. Five asphalt binders of different type and origin were considered. For comparison purposes, two available standard methods, based on low shear viscosity and MSC recovery tests, were included in the study. The obtained experimental results indicated the effectiveness of the test method in highlighting fundamental material properties related to rutting, overcoming some of the drawbacks of existing standard protocols.
Ezio Santagata; Orazio Baglieri; Muhammad Alam; Davide Dalmazzo. A novel procedure for the evaluation of anti-rutting potential of asphalt binders. International Journal of Pavement Engineering 2014, 16, 287 -296.
AMA StyleEzio Santagata, Orazio Baglieri, Muhammad Alam, Davide Dalmazzo. A novel procedure for the evaluation of anti-rutting potential of asphalt binders. International Journal of Pavement Engineering. 2014; 16 (4):287-296.
Chicago/Turabian StyleEzio Santagata; Orazio Baglieri; Muhammad Alam; Davide Dalmazzo. 2014. "A novel procedure for the evaluation of anti-rutting potential of asphalt binders." International Journal of Pavement Engineering 16, no. 4: 287-296.
Speeds are affected by several variables such as driver characteristics, vehicle performance, road geometrics, environmental conditions and driving regulations. It is therefore important to study the relationships between speed and such variables in order to facilitate conscious speed management on existing and planned roads, and to induce drivers to select a speed consistent with the posted limit. This relationship is of great interest to those who wish to achieve roadway functionality and improve overall road safety. A small number of studies have focused on this objective; however, few of them concern urban roads and they are limited to specific road types and recently built-up areas. These studies often refer to the 85th percentile of the speed distribution and are relevant to locations which are homogeneous in terms of geometry, environment, driving regulations and vehicle type. This paper presents results obtained from a study carried out on urban arterials and collectors characterized by dissimilar geometric features which facilitated the inclusion of a fully representative range of variables. A general model able to predict operating speed for a generic percentile was calibrated using three different strategies: (a) a simple multiple regression analysis in which the variables were selected using the Bayesian Information Criterion (BIC); (b) the analysis of covariance method including random effects on the same set of variables as in (a); and, finally, (c) the analysis of covariance method with random effects and a new selection of variables (again using BIC). The analysis shows a dramatic variation in results depending on the method selected. In particular, when random effects are considered, almost all the variables are found to be statistically significant.
Marco Bassani; Davide Dalmazzo; Giuseppe Marinelli; Cinzia Cirillo. The effects of road geometrics and traffic regulations on driver-preferred speeds in northern Italy. An exploratory analysis. Transportation Research Part F: Traffic Psychology and Behaviour 2014, 25, 10 -26.
AMA StyleMarco Bassani, Davide Dalmazzo, Giuseppe Marinelli, Cinzia Cirillo. The effects of road geometrics and traffic regulations on driver-preferred speeds in northern Italy. An exploratory analysis. Transportation Research Part F: Traffic Psychology and Behaviour. 2014; 25 ():10-26.
Chicago/Turabian StyleMarco Bassani; Davide Dalmazzo; Giuseppe Marinelli; Cinzia Cirillo. 2014. "The effects of road geometrics and traffic regulations on driver-preferred speeds in northern Italy. An exploratory analysis." Transportation Research Part F: Traffic Psychology and Behaviour 25, no. : 10-26.
Steric hardening is a time-dependent phenomenon that can affect the healing properties of bituminous binders. In the experimental investigation reported in this paper, the rheological test method proposed for the evaluation of healing involved the use of a prolonged rest period included between two continuous oscillatory loading phases. A simple model was developed to subtract the contribution of steric hardening to the total stiffness gain attained during rest and thus to evaluate the recovery in mechanical properties due to self healing only. Analysis of the results indicated that cumulated damage of binders is composed by a reversible and a non reversible part. True self healing potential of the materials, as evaluated by means of the relative reversible damage index (RRD) and the relative index of fatigue life increase (RFIHEALING), was found to be a function of imposed damage, binder source and polymer modificatio
Ezio Santagata; Orazio Baglieri; Lucia Tsantilis; Davide Dalmazzo. Evaluation of self healing properties of bituminous binders taking into account steric hardening effects. Construction and Building Materials 2013, 41, 60 -67.
AMA StyleEzio Santagata, Orazio Baglieri, Lucia Tsantilis, Davide Dalmazzo. Evaluation of self healing properties of bituminous binders taking into account steric hardening effects. Construction and Building Materials. 2013; 41 ():60-67.
Chicago/Turabian StyleEzio Santagata; Orazio Baglieri; Lucia Tsantilis; Davide Dalmazzo. 2013. "Evaluation of self healing properties of bituminous binders taking into account steric hardening effects." Construction and Building Materials 41, no. : 60-67.
In the experimental study reported in this paper a creep-recovery shear test method was used to evaluate the anti-rutting potential of different polymer-modified bituminous binders. The effects of several factors related to modification were investigated, such as polymer type (SBS, Styrene-Butadiene-Styrene vs. EVA, Ethylene-Vinyl-Acetate), composition (styrene content), structure (linear vs. radial SBS) and dosage (3-6% by weight of the base bitumen). The effect of short-term aging was also considered by comparing binder response before and after treatment with the Rolling Thin-Film Oven Test (RTFOT). Following previous work on the development of the test protocol, experimental results were analyzed by referring to shear modulus curves G(t) and to permanent compliance (JP), obtained by dividing residual strain at the end of the unloading phase by the stress applied during creep loading. Results indicated the effectiveness of the proposed method in discriminating between the behavior of the different polymer-modified binders and in capturing the effects caused by the factors considered in the investigation. Reliable rankings of the binders were established and were explained by referring to the specific behavior of employed modifier
Ezio Santagata; Orazio Baglieri; Davide Dalmazzo; Lucia Tsantilis. Evaluation of the anti-rutting potential of polymer-modified binders by means of creep-recovery shear tests. Materials and Structures 2013, 46, 1673 -1682.
AMA StyleEzio Santagata, Orazio Baglieri, Davide Dalmazzo, Lucia Tsantilis. Evaluation of the anti-rutting potential of polymer-modified binders by means of creep-recovery shear tests. Materials and Structures. 2013; 46 (10):1673-1682.
Chicago/Turabian StyleEzio Santagata; Orazio Baglieri; Davide Dalmazzo; Lucia Tsantilis. 2013. "Evaluation of the anti-rutting potential of polymer-modified binders by means of creep-recovery shear tests." Materials and Structures 46, no. 10: 1673-1682.
Natural asphalt as an additive in bituminous mixtures was subjected to evaluation by means of performance-related laboratory tests carried out on materials sampled from a production plant and a test section. Compaction issues were discussed by referring to binder viscosity and by considering the volumetrics of laboratory-compacted specimens. Mixture stiffness was assessed by means of repeated load indirect tensile tests carried out on field cores and by constructing pseudo master curves. Models were employed for the quantification of effects associated to enhanced compaction and binder ageing. Fatigue was also investigated by means of indirect tensile tests
Ezio Santagata; Pier Paolo Riviera; Davide Dalmazzo. Performance-Related Characterization of Bituminous Binders and Mixtures Containing Natural Asphalt. Procedia - Social and Behavioral Sciences 2012, 53, 535 -545.
AMA StyleEzio Santagata, Pier Paolo Riviera, Davide Dalmazzo. Performance-Related Characterization of Bituminous Binders and Mixtures Containing Natural Asphalt. Procedia - Social and Behavioral Sciences. 2012; 53 ():535-545.
Chicago/Turabian StyleEzio Santagata; Pier Paolo Riviera; Davide Dalmazzo. 2012. "Performance-Related Characterization of Bituminous Binders and Mixtures Containing Natural Asphalt." Procedia - Social and Behavioral Sciences 53, no. : 535-545.