Abstract
In this paper, a procedure for evaluating the effects of climate on pavement performance in Italy is proposed. To characterize the Italian territory nine different simulated scenarios have been used. These scenarios were obtained by combining three different situations of latitude (North, Central and South) with three conditions of altitude (high, medium, low altitude). For each of these scenarios, some configurations, proposed by the Italian CNR road pavement design catalog with medium and high traffic flow, were verified using the Mechanistic-Empirical Pavement Design Guide. The results obtained showed that the Italian CNR road pavement design catalog has a limited reliability.
Highlights
Introduction and literature reviewsPavements are an example of a complex engineering system requiring probabilistic modelling due to the uncertain nature of most of the pavement performance model parameters
The overall objective of the Mechanistic-Empirical Pavement Design Guide (MEPDG) is to provide the highway community with a state-of-the-practice tool for the design of pavement structures, based on mechanistic-empirical principles according to the Guide for Mechanistic-Empirical Design of New and Rehabilitated Pavement Structures of 2004
Where IRI – International Roughness Index, m/km; PSI – Pavement Serviceability Index, in particular is a concept derived during the AASHO Road Test
Summary
Pavements are an example of a complex engineering system requiring probabilistic modelling due to the uncertain nature of most of the pavement performance model parameters. The deterministic pavement performance models vary from simplistic empirical relationships to complex mechanisticempirical computational algorithms (Wojtkiewicz et al 2011). In this context, the overall objective of the Mechanistic-Empirical Pavement Design Guide (MEPDG) is to provide the highway community with a state-of-the-practice tool for the design of pavement structures, based on mechanistic-empirical principles according to the Guide for Mechanistic-Empirical Design of New and Rehabilitated Pavement Structures of 2004. As a support for implementing the new MEPDG, a sensitivity study was undertaken to assess the comparative effect of design input parameters pertaining to material properties, traffic and climate on the performance of two existing flexible pavements in Iowa with relatively thick asphalt concrete. Tests were performed on asphalt rubber binder and asphalt rubber asphalt concrete (ARAC) mix in order to verify whether the new MEPDG can be used effectively for asphalt rubber (AR) materials (Pasquini et al 2011)
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