Understanding the changes in the structural characteristics of paving layers with season and asphalt binders type is essential in predicting how well the pavement responds to traffic loads and thus how long it will last. This paper presents a small scale investigation on the seasonal variations in the structural characteristics of pavement layers constructed employing polymer modified asphalt binders. These variations are compared to those of an unmodified binder. Illustrated are the influences of asphalt binder type and seasonal temperature variations on: One) center deflection (D0) measured by the falling weight deflectometer (FWD), Two) in situ asphalt concrete modulus (EAC), Three) in situ base course modulus (Eb) and Four) in situ subgrade resilient modulus (MmR) Analysis of results for the two polymer modified sectins and the three unmodified onctrol section used in this study indicates that EAC is the parameter most affected by the change in temperature followed by D0 and Eb . The in situ asphalt concrete modulus (EAC) of the polymer modified sections has shown less sensitivity to temperature changes than other three control sections, especially at high temperature levels (35 0 C -45 0 C). Variations in Eb with temperature are believed to be associated indirectly with variations in EAC with temperature. Changes in EAC with temperature result in changes in stress levels imposed on the underlying layer that causes variations in Eb . Temperature adjustment factors for D0, EAC and Eb are provided for both polymer modified and unmodified sections. For the covering abstract of this conference see IRRD number 872978.

This volume highlights the latest advances, innovations, and applications in the field of asphalt pavement technology, as presented by leading international researchers and engineers at the 5th International Symposium on Asphalt Pavements & Environment (ISAP 2019 APE Symposium), held in Padua, Italy on September 11-13, 2019. It covers a diverse range of topics concerning materials and technologies for asphalt pavements, designed for sustainability and environmental compatibility: sustainable pavement materials, marginal materials for asphalt pavements, pavement structures, testing methods and performance, maintenance and management methods, urban heat island mitigation, energy harvesting, and Life Cycle Assessment. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.

Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.

Asphalt Pavements provides the know-how behind the design, production and maintenance of asphalt pavements and parking lots. Incorporating the latest technology, this book is the first to focus primarily on the design, production and maintenance of low-volume roads and parking areas.Special attention is given to determining the traffic capacity, re

The purpose of the field validation program was to evaluate the thermal stress restrained specimen test (TSRST) as the accelerated performance test to predict low-temperature cracking of asphalt concrete mixtures. Construction histories, cracking observations, and temperature data were collected for five test roads. In addition, a validation program was conducted at the United States Army Cold Regions Research and Engineering Laboratory. The laboratory test program consisted of performing the TSRST on specimens fabricated in the laboratory with original materials from the test roads and asphalt concrete pavement specimens cut from the actual test sections. In addition, the field pavements were monitored for crack history and, where possible, crack initiation. TSRST fracture temperature correlated with field cracking temperature and crack frequency. TSRST results can be used to predict field low-temperature cracking of asphalt-aggregate mixtures. Preliminary models to predict cracking frequency and temperature for the test roads were developed.