Investigation of Glass Transition Temperature of Asphalt Concrete

Abstract

Abstract The presented manuscript identifies the mix design parameters important for the glass transition temperature and thermo-volumetric properties of asphalt–concrete mixes. A number of compacted specimens were prepared at different air-void content, by mixing different composition of materials in terms of aggregate origins, asphalt types, and gradations. The compacted mixes were later sized to required dimensions and were subjected to a uniform rate of cooling in a specially designed testing machine. The contraction of the sample during the cooling was measured by linear vertical displacement transducers, and the recorded values obtained were converted into longitudinal strain. All variables investigated in the study were found statistically significant to impact the glass transition temperature of asphalt paving mixes. The methodology adopted in this study provides a new approach to predict glass transition temperatures in asphalt–concrete mixes and identifies the mix parameters that will be helpful in delaying the glass transition temperature of the mix for reliable performance of asphaltic pavements in cold regions.