Investigation of glass transition temperature of asphalt concrete

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Qadir A., Güler M.

Journal Of Testing And Evaluation, vol.45, no.5, pp.1680-1690, 2017 (SCI-Expanded)

  • Publication Type: Article / Article
  • Volume: 45 Issue: 5
  • Publication Date: 2017
  • Doi Number: 10.1520/jte20160023
  • Journal Name: Journal Of Testing And Evaluation
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1680-1690
  • Middle East Technical University Affiliated: Yes


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 air-void content, by mixing

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.