Rheological characteristics of aged asphalt binder

来源期刊:中南大学学报(英文版)2008年增刊第1期

论文作者:刘聪慧 吴少鹏 刘全涛 朱国军

文章页码:298 - 301

Key words:aged asphalt binder; rheological characteristics; viscoelastic property; mass ratio of mineral powder to asphalt

Abstract: Different aging levels (RTFOT,PAV-10h, PAV-20h and PAV-30 h) 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 δ increases 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.

基金信息:2006 West Science and Technology Project of the Department of Transportation

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