基于水泥水化模拟的水泥石毛细孔结构分析

Cement Hydration Simulation Based Analysis of Capillary Pore Structure in Cement Paste

通过水泥水化模拟分析了水泥石毛细孔结构。基于水化动力学原理,模拟水泥水化全过程,将模拟所得的水化度与试验结果比较,验证了模拟方法的有效性。提出了水泥石毛细孔隙率和内表面积的数值方法,数值结果表明,孔隙率随着时间不断减小,内表面积先随着时间不断增大,到达峰值后随着时间逐渐减小,水灰比越小,出现峰值的时间越短。水化28d时,水灰比为0.3的水泥石毛细孔隙率和内表面积分别比水灰比为0.5的水泥石毛细孔隙率和内表面积小61%和11%。

The capillary pore structure in cement paste is analyzed through cement hydration simulation. Based on the principles of hydration kinetics, the whole process of cement hydration is simulated. The validity of the simulation method is verified by comparing the simulated degree of hydration with experimental results. A numerical method is presented for the porosity and internal surface area of capillary pores in cement paste. Numerical results show the cap- illary porosity decreases with time. The internal surface area of capillary pores first increases continuously with time and then decreases gradually with time after the peak value reached. The smaller the water/cement ratio is, the shorter the time corresponding to the peak value is. At the age of 28 days, the porosity and internal surface area of capillary pores in cement paste with a water/cement ratio of 0. 3 is smaller than those with a water/cement ratio of 0. 5 by 61% and 11 %, respectively.