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首先通过高分辨微型CT系统观测水灰比为0.5的水泥浆体内部微米级孔隙并对其尺寸进行统计分析,获得水泥浆体内部孔隙结构特征和两大类微米级孔隙的直径分布,然后引入孔隙介质细观断裂模型,将观测获得的孔隙特征作为模型参数,对水泥浆体的宏观力学性能进行计算,获得其应力–应变曲线和极限拉伸强度,最后将力学模型计算结果与实验结果进行对比分析。极限拉伸强度的计算和实验结果分别为9.47和7.96 MPa。微型CT系统可以准确地获取水泥浆体内部的微米级孔隙信息,孔隙结构信息引入细观断裂模型后的计算结果准确度较高。
Firstly, the microscopic pore of cement paste with a water-cement ratio of 0.5 was observed by high-resolution micro-CT system and its size was statistically analyzed to obtain the pore structure characteristics of the cement paste and the diameter distribution of two types of micron-scale pores, and then introduced In the meso-fracture model of porous media, the macroscopic mechanical properties of cement paste were calculated by taking the observed pore characteristics as model parameters, and the stress-strain curves and ultimate tensile strength were obtained. Finally, the calculation results of the mechanical model were compared with the experimental results Comparative analysis. The calculation and experimental results of the ultimate tensile strength are 9.47 and 7.96 MPa, respectively. The micro-CT system can accurately obtain the micron-scale pore information inside the cement slurry, and the accuracy of the calculation results after the pore structure information is introduced into the mesoscopic fracture model is high.