A multi-phase model for predicting the effective diffusion coefficient of chlorides in concrete

被引：97
作者：
Li, Long-Yuan [2 ]
Xia, Jin [1 ,2 ]
Lin, San-Shyan [3 ]
机构：
[1] Zhejiang Univ, Inst Struct Engn, Hangzhou 310058, Zhejiang, Peoples R China
[2] Univ Birmingham, Sch Civil Engn, Birmingham B15 2TT, W Midlands, England
[3] Natl Taiwan Ocean Univ, Dept Harbor & River Engn, Keelung, Taiwan
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2012年 / 26卷 / 01期
关键词：
Chloride; Diffusion; Concrete; Multi-phase; Composites; CEMENT-BASED MATERIALS; PORE STRUCTURE; MORTAR; TRANSPORT; MEDIA;
D O I：
10.1016/j.conbuildmat.2011.06.024
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
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.
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页码：295 / 301
页数：7
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