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采用COMSOL Multiphysics软件建立了水化硅酸钙(calcium silicate hydrate,简称C-S-H)纳米颗粒的微观物理模型,并以水泥基材料收缩机理为依据,考虑了不同湿度下,由于C-S-H纳米颗粒堆积密度不同,而造成的不同局部孔径,较为真实地模拟了C-S-H纳米颗粒之间的作用力,得出不同湿度下C-S-H纳米颗粒簇的干缩力和体积应变量.研究发现在湿度较高的状态下,水化硅酸钙簇的应力和变形都受孔径影响较大.本方法对于理解水泥基材料微结构的收缩变形机理有一定的帮助,可用于水泥基材料基于微观结构的收缩性能预测.
The microscopic physical model of calcium silicate hydrate (CSH) nanoparticle was established by COMSOL Multiphysics software. Based on the shrinkage mechanism of cement-based material, considering the different packing density of CSH nanoparticles under different humidity, And the different local pore sizes caused by CSH nanoparticles are simulated more accurately than those of CSH nanoparticles.The results show that under the condition of high humidity, The stress and deformation of calcium silicate clusters are greatly affected by the pore size.The method is helpful to understand the shrinkage and deformation mechanism of the microstructure of cement-based materials and can be used to predict the shrinkage properties of cement-based materials based on microstructure.