橡胶混凝土应力和强度的细观数值分析

Numerical Simulation on Micro-level of Stress and Strength in Crumb Rubber Concrete

利用富勒公式将三维级配曲线转化为二维平面内任意粒径集料出现的概率,在细观层次上将橡胶混凝土离散为粗集料、橡胶集料和水泥砂浆,建立了橡胶混凝土粗集料及橡胶集料随机分布的集料模型.将橡胶混凝土作为普通混凝土与橡胶集料组成的二相复合材料.利用有限元方法对橡胶混凝土二相复合材料模型的轴心抗压强度进行计算和分析,并和试验结果进行对比,结果表明:该分析方法能很好地模拟计算橡胶混凝土的轴心抗压强度,给出了模型加载过程中的细观应力分布及变化情况,模拟结果较好地反映了橡胶混凝土在单轴作用下的力学特性.

Fuller formula is used to translate three dimensional particle grades into probability of arbitrary aggregates diameter in two dimensional plane. Crumb rubber concrete（CRC） is dispersed to form structure with three phrases composite materials, coarse aggregates, rubber crumbs and mortar. The random distribution model of coarse aggregates and rubber crumbs is estab-lished. Normal concrete is made of aggregates and mortar matrix. CRC is assumed to be compos-ite material of two phases of concrete and rubber crumbs. The finite element method is employed to simulate the uniaxial compression strength. The results is in accord with those of the experiment well. It is demonstrated that the numerical method can be used to forecast the strength of CRC in uniaxial load approximately. The stress distributions in the micro-level structure of CRC are presented, which can explain the mechanics behavior of CRC in uniaxial condition.