作　　者： ; ; ;

机构地区： 东南大学交通学院

出　　处： 《华南理工大学学报（自然科学版）》 2009年第7期31-36,共6页

摘　　要： 为了分析粗集料和空隙对沥青混合料粘弹性能的影响,在Laplace空间域内,利用细观力学的Mori-Tanaka等效夹杂理论解决了沥青混合料的混合夹杂问题.然后基于宏观平均场理论,根据沥青砂浆基体的粘弹性能推导了沥青混合料的粘弹性能.最后以单轴和简单剪切应力下的预测为例,分析了粗集料和空隙对沥青混合料性能的影响.结果发现:沥青混合料粘弹本构方程可以表示为粗集料和空隙的综合影响系数与沥青砂浆粘弹本构方程的乘积形式;空隙和粗集料对沥青混合料的粘弹性分别起到衰减和增强作用,但空隙的衰减作用弱于粗集料的增强作用;粗集料和空隙对沥青砂浆的综合影响体现为对刚度的增强作用,且剪切应力下增强作用近似为单轴应力下的2倍;沥青砂浆基体泊松比对综合影响系数的影响甚微,在以后的研究中可以取定值. In order to reveal the effects of coarse aggregates and voids on the viscoelasticity of asphalt mixtures, the hybrid inclusion problem of asphalt mixtures in Laplace space is solved by using Mori-Tanaka＇s equivalent inclusion method. Then, based on the macroscopic mean field theory, the viscoelasticity of asphalt mixtures is discussed according to that of asphalt mortar matrix. Moreover, by taking the predictions under uniaxial and simple-shear stresses for example, the influences of coarse aggregates and voids on the performances of asphalt mixtures are investigated. The results show that the viscoelastic constitutive equation of asphalt mixtures can be expressed as the product of a comprehensive influence coefficient of coarse aggregates and voids and the viscoelastic constitutive equation of asphalt matrix, that the increase of air voids may result in the decrease of viscoelasticity, while the volumetric fraction of coarse aggregates has an opposite effect, that the weakening effect of air voids is slighter than the strengthening effect of coarse aggregates, that coarse aggregates and voids result in a comprehensive enhancing coefficient of stiffness for asphalt mortar, that the enhancing coefficient under simple-shear stress is approximately 2 times that under uniaxial stress, and that Poisson＇s ratio of asphalt mortar matrix can be regarded as a constant in the following researches due to its slight effect on the comprehensive influence coefficient.

关 键 词： 沥青混合料 粘弹性 细观力学 粗集料 空隙 综合影响系数

领　　域： [交通运输工程]