Rheological characteristics of aged asphalt binder
Different aging levels (RTFOT, PAV-10h, PAV-20h and PAV-30h) of asphalt binders with various mass ratios of mineral powder to asphalt (0, 0.4, 0.8, 1.2, 1.6, 2.0) were used to investigate the rheological properties of aged asphalt binders with respect to their short and long terms aging characteristics. Viscosity test, dynamic shear test and creep test were conducted. The test results indicate that the viscosity of aged asphalt binder increases sharply with the extension of aging period. Complex shear modulus of aged asphalt increases, which indicates that the stiffness of asphalt binders can increase. The phase angle for aged asphalt binders reduces, which indicates that the elastic portion for viscoelastic property of asphalt binders increases. │G*│sin δincreases after aging procedure which means that the fatigue resistance becomes poor. The creep test results show that creep strain curves varies remarkably for virgin and aged asphalt binders. The total strain during loading period and the permanent strain decreases significantly for aged asphalt binders, which implies that the elastic portion increases and the viscous portion decreases.
aged asphalt binder rheological characteristics viscoelastic property mass ratio of mineral powder to asphalt
LIU Cong-hui(刘聪慧) WU Shao-peng(吴少鹏) LIU Quan-tao(刘全涛) ZHU Guo-jun(朱国军)
Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education,Wuhan University of Technology, Wuhan 430070, China
国际会议
长沙
英文
298-301
2008-09-28（万方平台首次上网日期，不代表论文的发表时间）