A multi-phase model for predicting the effective diffusion coefficient of chlorides in concrete
A multi-phase model for predicting the effective diffusion coefficient of chlorides in concrete
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DOI：
10.1016/j.conbuildmat.2011.06.024
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发表时间：
2012-01-01
影响因子：
7.4
通讯作者：
Lin, San-Shyan
中科院分区：
文献类型：
--
作者：
Li, Long-Yuan;Xia, Jin;Lin, San-Shyan
本文提出了一个细观结构模型，并用于研究氯离子在混凝土中的扩散行为。混凝土是由水泥浆体和骨料两相组成的非均质材料。假定氯离子扩散仅发生在水泥浆相中。通过模拟不同骨料体积分数的混凝土，研究骨料含量对混凝土中氯离子扩散的影响。结果表明，由二维和三维模型得到的有效扩散系数是不同的。二维串联和并联模型分别提供有效扩散系数的上界和下界，而三维模型提供精确的有效扩散系数。三维模拟结果表明，麦克斯韦模型能够准确预测氯离子在混凝土中的有效扩散系数。(C)2011爱思唯尔有限公司版权所有。
In this paper, a mesoscopic structure model is proposed and is used to investigate the chloride diffusion behaviour in concrete. The concrete is treated as a heterogeneous material composed of cement paste and aggregate two phases. The chloride diffusion is assumed to take place only in the cement paste phase. By modelling concretes with different aggregate volume fractions the effect of aggregate content on chloride diffusion in concrete is examined. The results show that the effective diffusion coefficients obtained from the two- and three-dimensional models are different. The two-dimensional series and parallel models provide upper and lower bounds of the effective diffusion coefficient, respectively, whereas the three-dimensional model provides the accurate effective diffusion coefficient. The three-dimensional simulation also demonstrates that the Maxwell model is able to predict accurate effective diffusion coefficient of chlorides in concrete. (C) 2011 Elsevier Ltd. All rights reserved.