水泥基复合半刚性面层材料热应力分析

Thermal Stress Analyses of Cement Based Semi Rigid Surface Course Composite

根据水泥基复合半刚性面层材料（ＣＢＳＣＣ）的微结构，建立了把裹橡胶沥青粗集料颗粒球和水泥砂浆空心基体球嵌入ＣＢＳＣＣ等效复合材料介质中的三层嵌套模型，推导了热应力计算公式．计算结果表明，降温时粗集料相及橡胶沥青相处于压应力状态，水泥砂浆相中存在切向拉应力，ＣＢＳＣＣ等效复合材料中存在法向拉应力．应力值较参加比较的水泥混凝土材料对应相中的应力值小４倍以上，橡胶沥青体积份数增加３倍，界面法向应力减小１２～４倍；橡胶沥青弹性模量增加６６倍，界面法向应力增加３～１３倍．

According to the micro structure of cement based semi rigid surface course composite (CBSCC),a three layer built in thermal stress model is established by putting a spherical coarse aggregate particle covered with rubberized asphalt and hollow spherical cement mortar matrix into equivalent CBSCC media.The calculation results show that ,when cooling,coarse aggregate phase and rubberized asphalt phase are in compression,while tangential tensile stress in cement mortar matrix and normal tensile stress in equivalent CBSCC media are developed.The stress values in each phase of CBSCC are at most one forth as large as those in corresponding phase of controlled cement concrete.When the fraction values of rubberized asphalt are tripled,the interface normal stresses are reduced by twenty percent to three hundred percent;when the elastic modulus of rubberized asphalt is increased by sixty five hundred percent,the interface normal stresses are increased by two hundred percent to twelve hundred percent.