粒径分布对水泥水化过程影响的数值模拟

Simulation of the effects of the particle size distribution on cement hydration

为了模拟水泥粒径分布对水泥水化过程的影响,本文建立了一个基于水化深度的水化模型。该模型假定水泥水化过程由水化深度控制,且水化深度随时间的变化关系与颗粒粒径无关。通过等温差示扫描量热仪测定了2种不同粒径分布水泥的等温水化热曲线,根据试验结果分析得出最大水化深度的存在,并推导得出水化模型所需的基准水化速率。最后将建立的水化模型用于模拟水泥的等温水化热曲线。结果表明:基于水化深度的水化模型能够准确模拟水泥粒径分布对水泥水化过程的影响。

The effects of the particle size distribution on cement hydration were analyzed using a hydration model based on the hydration depth.The hydration process was assumed to be controlled by the hydration depth,which is independent of particle size.The isothermal hydration heat generation rates of cements with different particle size distributions（PSD）were measured using an isothermal differential scanning calorimeter.The results were used to determine the maximum hydration depth and the reference hydration rate.The model was then used to simulate the isothermal hydration heat generation in cement.The results show that the hydration model based on the hydration depth can accurately simulate the effects of the particle size distribution on cement hydration.