沥青混合料粘弹性能微观力学分析  

Micromechanical Analysis on Viscoelasticity of Asphalt Mixtures

作　　者：薛国强[1] 张裕卿[1] 黄晓明[1] 

机构地区：[1]东南大学交通学院

出　　处：《公路交通科技》2009年第6期18-23,共6页Journal of Highway and Transportation Research and Development

基　　金：国家高技术研究发展计划(八六三计划)资助项目(2006AA11Z110)

摘　　要：利用Mori-Tanaka等效夹杂微观力学理论研究了沥青混合料的粘弹性能。将沥青混合料看作刚性粗集料颗粒夹杂于粘弹性沥青砂浆基体内的复合材料,对集料夹杂和沥青砂浆基体的本构方程分别进行Laplace变换成弹性问题,在Laplace空间域内应用Mori-Tanaka等效夹杂和宏观平均理论由沥青砂浆粘弹性能推导出了沥青混合料的粘弹性能。结果表明,粗集料颗粒夹杂对粘弹性沥青基体性能具有增强作用,沥青混合料粘弹本构方程可表示为粗集料增强系数与沥青基体粘弹本构方程的乘积形式。利用增强系数可以从性质较均匀的沥青基体粘弹性来预测性能较复杂的沥青混合料的粘弹性。其中增强系数大于1且随粗集料体积分数或沥青基体的泊松比增加而增大,粗集料体积分数对增强系数的增大作用远大于沥青砂浆基体泊松比对其的影响。Mori-Tanaka equivalent inclusion micromechanics theory was employed to investigate the viscoelasticity of asphalt mixture. Asphalt mixture was regarded as composites which treated coarse aggregate as a rigid inclusion and the mixture of fine aggregate, filler and binder as viscoelastic matrix. The constitutive relations of coarse aggregate inclusion and fine aggregate- filler-binder matrix were converted into elastic problems by Laplace transformation. Then the Mori-Tanaka equivalent inclusion and average theory were used to deduce the viscoelastic performance of asphalt mixture based on that of asphalt mortar in Laplace space. The result shows that （ 1 ） coarse aggregate inclusion can enhance the viscoelastic performance of fine aggregate-filler-binder matrix and viscoelastic constitutive relation of asphalt mixtures can be expressed as the product of an enhancement coefficient of coarse aggregate and the viscoelastic constitutive relation of fine aggregate-filler-binder matrix; （2） the viscoelasticity of the complex asphalt mixture can be predicted from the viscoelasticity of the homogeneous fine aggregate-filler-binder matrix by using the enhancement coefficient; （3） the enhancement coefficient is higher than 1.0 and it rises with increasing of coarse aggregates＇ volumetric fraction or Poisson＇ s ratio of fine aggregate-filler-binder matrix but the effect of the former is more important than that of the latter.

关 键 词：道路工程 沥青混合料 粘弹性 微观力学 Mori—Tanaka方法 增强系数 

分 类 号：U414[交通运输工程—道路与铁道工程]