掺硅灰的低水胶比水泥水化产物定量预测方法

Quantitative Prediction Method for Hydration Products of Cement Containing Silica Fume with Low Water to Binder Ratios

摘要:

基于低水胶比下水泥水化原理以及硅灰作用机制，考虑体系中氢氧化钙量的变化，修正中心粒子模型，提出掺硅灰的低水胶比水泥水化产物体积分数预测方法.对比提出方法、试验数据、Power模型以及Jensen模型,结果表明：所提方法可较好地描述掺硅灰的低水胶比水泥水化进程并定量预测不同水化产物的体积含量；当无硅灰时，所提方法计算的未水化水泥和化学收缩的体积与Power模型计算结果基本一致；当含有硅灰时，所提方法计算的水化产物的体积分数与Jensen模型的模拟相近.

Abstract:

A volume fraction prediction method of hydration products of the paste containing silica fume with low water to binder ratios was proposed, which considered the cement hydration mechanism and silica fume reaction mechanism with low water to binder ratios and modified the shrinking-core model. The comparison of calculation results of the proposed method, expeimental results and theoretical results of Power Model and Jensen Model showed that the proposed method was capable of simulating the hydration process and predicting volume fractions of different hydration products well; When no silica fume was mixed, volume fractions of unhydrated cement and chemical shrinkage calculated by the proposed method were basically the same as that of Power Model while volume fractions of hydration products of the proposed model were close to that of Jensen Model with silica fume.