COMPUTER-SIMULATION OF THE DIFFUSIVITY OF CEMENT-BASED MATERIALS
COMPUTER-SIMULATION OF THE DIFFUSIVITY OF CEMENT-BASED MATERIALS
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DOI：
10.1007/bf01117921
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发表时间：
1992-04-15
影响因子：
4.5
通讯作者：
BENTZ, DP
中科院分区：
文献类型：
--
作者：
GARBOCZI, EJ;BENTZ, DP
采用基于数字图像的水泥浆体微观结构模型，结合精确输运算法，研究了波特兰水泥浆体的扩散系数。考虑的主要变量是水：水泥比，水泥水化程度和毛细管孔隙度。计算方法和扩散率的结果，这是同意与实验误差内的实验测量。模型水泥浆制备不同的水：水泥比，并具有不同程度的水化，被发现具有扩散系数，躺在一个单一的主曲线作为毛细管孔隙度的函数时绘制。从渗流理论的概念被用来定量地解释毛细管孔隙度的扩散系数的依赖关系。还考察了硅灰添加对扩散系数的影响。
A digital image-based model of the microstructure of cement paste, coupled with exact transport algorithms, is used to study the diffusivity of Portland cement paste. The principal variables considered are water:cement ratio, degree of cement hydration and capillary porosity. Computational methods are described and diffusivity results are presented, which are found to agree with the available experimental measurements within experimental error. Model cement pastes prepared with different water:cement ratios, and having different degrees of hydration, are found to have diffusivities that lie on a single master curve when plotted as a function of capillary porosity. Concepts from percolation theory are used to explain quantitatively the dependence of diffusivity on capillary porosity. The effect of silica fume addition on diffusivity is also examined.