Published Online: 13 August 2009
Page Count: 9
Senior Researcher, Highway Research Division, Infrastructure Research Dept., Korea Institute of Construction Technology, Goyang-Si, Gyeonggi-Do
Lee, Tai Sik
Professor, Civil and Environmental System Engineering, Hanyang Univ. at Ansan, Ansan-si, Gyeonggi-do
Pavement Management Group, City Transportation Headquarters, Seoul Metropolitan Government,
Bahia, Hussain U.
Professor, Civil and Environmental Engineering, Univ. of Wisconsin–Madison, Madison, WI
(Received 13 October 2008; accepted 22 June 2009)
Moisture damage tormenting asphalt pavement materials is a very complex interaction occurring between asphalt binder, its aggregate, and water. To estimate or index the moisture sensitivity of the asphalt pavement materials, compacted asphalt mixtures are commonly used in mechanical tests providing a strength-related parameter for evaluating moisture susceptibility. The compacted mixture structures, however, can cause a problem that fundamental properties between asphalt binder and its aggregate are easily stumbled behind the complicated aggregates-asphalt-air voids structure. In order to help resolve this problem and find the fundamental properties such as adhesion or cohesion strength, dynamic shear rheometer and rock disks were used in a modification way of the standard asphalt binder testing protocol, and functional parameters such as yield shear stress (YSS) and wet to dry (W/D) YSS ratio were found in the previous research. A protocol more advanced and in more detail than the previous research is suggested in this subsequent study. In addition, the relative independence of the YSS and W/D YSS ratio is proven upon heating effects, and the sensitivity of the parameters to material-specific is also reaffirmed, in more tests performed for this research. For this proving process, rheological values measured per heating cycle are compared and plotted. The results, analyzed with more data than measured in the previous research, indicate that YSS and W/D YSS ratio, even in the expanded data set, can be alternative parameters to evaluate moisture damage.
Paper ID: JTE102178