基于蠕变试验的沥青粘弹性损伤特性  

VISCOELASTIC DAMAGE CHARACTERISTICS OF ASPHALT BASED ON CREEP TEST

作　　者：郑健龙[1] 吕松涛[1] 田小革[1] 

机构地区：[1]长沙理工大学公路工程学院,湖南长沙410076

出　　处：《工程力学》2008年第2期193-196,共4页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50408007);高等学校博士学科点专项科研基金项目(20050536001)

摘　　要：通过BBR-弯曲梁流变仪在不同温度下进行沥青小梁蠕变试验,得到了不同温度下的蠕变柔量曲线。通过移位,按WLF公式推导得到了不同温度下的移位因子和各个温度下的蠕变柔量主曲线簇。用Weibull函数来描述沥青内部缺陷的分布,将Burgers粘弹性模型与连续损伤因子模型二者耦合建立了沥青的粘弹性损伤模型。理论模型和试验结果比较吻合,表明在沥青粘弹性性能评价过程中考虑损伤效应的影响是必要的。The creep tests of asphalt beam were carried out at different temperatures by using Bending Beam Rheometer （BBR）. The creep compliance curves were obtained. By shifting, the shift factors are deduced by Williams-Landel-Ferry （WLF） equation and the creep compliance master curve clusters are obtained at different temperatures. A viscoelastic damage model is established by coupling the continuum damage factor into the Burgers viscoelastic model. The distribution of the asphalt inner flaw is described by Weibull function. The theoretical model shows good agreement with the experiment results, which indicates that it is necessary to consider the influence of damage effect during the evaluations of asphalt viscoelastic characteristics.

关 键 词：沥青路面 粘弹性 蠕变试验 损伤 WLF公式 主曲线 

分 类 号：U416.217[交通运输工程—道路与铁道工程]