水泥石水渗透系数预测的数值方法

A numerical method for predicting water permeability coefficient of cement paste

基于水泥石结构的计算机模拟,提出了水渗透系数估计的随机行走算法。在该算法中,将水泥颗粒模拟成各种尺寸的球体,应用水化反应原理,在微观水平上重构水泥石结构,并进一步计算水化度和毛细孔隙率。与实测值和经验公式对比,验证了水泥水化模型的有效性。基于微观水平上重构的水泥石结构,应用随机行走算法计算水渗透系数。与有效介质方法相比,初步证实了该算法的有效性,也详细分析了该算法的局限性。

Based on the computer simulation of the structure of cement paste, a random walk algorithm is presented for estimating the water permeability coefficient. In the algorithm, cement particles are modeled as spheres of various sizes. The principles of hydration reaction are used to reconstruct the structure of cement paste on the microscopical level and to further evaluate the degree of hydration and the capillary porosity. Through comparison with the experimentally measured values and the empirical formula, the validity of the cement hydration model is verified. Based on the reconstructed structure of cement paste on the microscopical level, the random walk algorithm is used to compute the water permeability coefficient. Through comparison with the effective medium method, the validity of the algorithm is preliminarily verified. At the same time, the limitation of the algorithm is also analyzed in detail.