沥青混合料动态蠕变模量与动稳定度的关系

Correlation of Dynamic Creep Stiffness Modulus with Dynamic Stability of Asphalt Mixtures

研究了分别基于AC13和AC25优化出的9组级配、SBS改性中海70#沥青和中海70#沥青两种结合料、花岗岩和石灰岩两种集料以及50,70 mm两种车辙试件厚度等条件下的沥青混合料动稳定度(DS)与车辙模量(EDS),EDS与动态蠕变劲度模量(Sdy),Sdy与DS这三者的关系.结果表明,不同沥青混合料的Sdy与采用厚度匹配的车辙试件DS之间存在良好的相关性.因此可以将DS转换为Sdy,并用其作为沥青路面结构设计的参数.

Dynamic stability（DS） of asphalt mixtures can better characterize anti-rutting behavior of asphalt pavement at high temperature but can not be used as a design parameter to calculate the structure thickness of asphalt pavements. However, it can be transformed into rutting modulus（EDS） to find the relationship between dynamic creep stiffness modulus（Sdy） and DS. The relationships between DS and EDs, EDs and Say, Say and DS of asphalt mixtures were examined, in which 4 sets of gradation ACl3 using Zhonghai asphalt 70# modified with SBS and granite aggregate and 5 sets of gradation AC25 using Zhonghai asphalt 70# and lime stone aggregate were used. The rut specimen＇s thickness of 50, 70 mm for ACl3 and AC25 were used. The results show there exist a good relationship between Say and DS of asphalt mixtures for using matching wheel tracking test specimens and it is concluded that DS can be transformed into Sdy as a design parameter to calculate the structure thickness of asphalt pavements.