聚合物骨架空隙混凝土细观模型及结合料的受力分析

Micromechanical Model of Polymer Modified Porous Concrete and Stress Analysis of Its Binder

基于聚合物骨架空隙混凝土的力学性能在很大程度上依赖于结合材料的力学性能,运用有限元计算方法研究结合料的性能和其厚度对聚合物骨架空隙混凝土的影响,可以减少试验工作量、优化聚合物骨架空隙混凝土材料的配比设计。有限元计算时,针对聚合物骨架空隙混凝土"弹性结合料+骨料+空隙"的构造特点,细观计算模型中考虑了混凝土内部的构造空隙;针对结合料厚度较小的特点,采用了细观单元建模,材料参数取值采用了试验结果的代表值。结果表明,计算值和试验值吻合较好,说明细观模型能够较好模拟弹性聚合物骨架空隙混凝土的力学特性;聚合物骨架空隙混凝土采用较厚的聚合物水泥结合料对聚合物骨架空隙混凝土材料的整体受力有利。

The mechanical property of polymer modified porous concrete （PMPC） largely depends on the mechanical property of bonding material. The experimental workloads can be decreased and the PMPC mix can be optimized through study the effect of performance and thickness of bonding material on PMPC by finite element method. The inner pore of PMPC was taken into account in the micromechanical model according to the configuration feature of PMPC （elastic bonding merterial ＋ aggregate ＋ void ） . Meanwhile because of the slim thickness of bonding material, the microscopic meshes were used in the model and the adopted mechanical property values of material were based on experimental representative values. It shows that （1） the calculation result is coincides with the experimental result, which indicates that the micromechanical model of PMPC is exactitude; （2） the bonding material with large thickness is beneficial for the mechanical property of PMPC.