Thermo-volumetric properties of asphalt binders and mixtures

J. O. Ojo, D. Fratta, H. U. Bahia, C. Daranga, Mihai Marasteanu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The glass transition temperature of asphalt binders and mixtures is an essential component for the prediction of thermal cracking of pavements. For many decades this subject has been studied but published results are very limited. Measuring thermo-volumetric properties of asphalt paving materials is not simple and there are no standard methods for conducting such measurements. In this study, a dilatometric system for measuring binder properties was used to study the glass transition of ten binders and a length change measuring system was used to measure the glass transition of asphalt mixtures. Results show a variation in glass transition behavior as function of the binder grade and modification. Furthermore, the glass transition of the mixtures does not correlate with binder glass transition properties, which highlights the importance of aggregate characteristics and mixture compaction in defining mixture thermo-volumetric properties. It is also found that the contraction and dilation behavior of mixtures shows a hysteretic response. These findings hint at a need for fundamental understanding of the effect of aggregate interaction in the thermal behavior of asphalt mixtures and they also shed some light on the important aspect of thermal cracking of pavements and the measurements needed for better modeling.

Original languageEnglish (US)
Title of host publicationPavement Cracking
Subtitle of host publicationMechanisms, Modeling, Detection, Testing and Case Histories
Pages469-479
Number of pages11
StatePublished - Dec 1 2008
Event6th RILEM International Conference on Cracking in Pavements - Chicago, IL, United States
Duration: Jun 16 2008Jun 18 2008

Other

Other6th RILEM International Conference on Cracking in Pavements
CountryUnited States
CityChicago, IL
Period6/16/086/18/08

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