水泥水化二维模拟的数值方法及其应用

通过引入周期性边界条件获得了正方形单元上水泥颗粒的初始分布。在水泥水化二维模拟中,假设水泥表面各点的反应速率相等,每个水泥颗粒用3个同心圆表示,引入3个参数量化相邻水泥颗粒之间的相互干涉,建立各相组分增量之间的关系。通过与已有试验结果进行比较,验证了水泥水化二维模拟数值方法的有效性,分析了养护温度对水化度的影响。应用该方法定量分析了毛细孔、未水化水泥和水化产物的面积百分数,毛细孔两点概率函数以及单位面积毛细孔周长随水化时间的变化规律。

Numerical method for two-dimensional simulation of cement hydration and its application

The initial distribution of cement particles within a square element is obtained by introducing periodic boundary conditions.In the two-dimensional simulation of the cement hydration,all points on the cement surface are assumed to have an equal reaction rate and each cement particle is represented by three concentric circles.By introducing three parameters,the mutual interference between neighbouring cement particles is quantified and the incremental relationships among various phase constituents are established.The validity of the proposed numerical method is verified by comparing its results with the exiting test results.The effect of curing temperature on the degree of hydration is analyzed.The area fractions of capillary pores,unhydrated cement and hydrated products as well as the variations of the two-point probability function of capillary pores and the capillary perimeter per unit area with hydration time are quantitatively analyzed by means of the proposed method.Some useful conclusions are drawn.