Numerical calculation on the porosity distribution and diffusion coefficient of interfacial transition zone in cement-based composite materials

被引：33
|
作者：
Jiang Jin-yang [1 ]
Sun Guo-wen [1 ]
Wang Cai-hui [1 ]
机构：
[1] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2013年 / 39卷
关键词：
Cement-based composite materials; Interfacial transition zone; Diffusion coefficient; Porosity distribution; ELECTRICAL-CONDUCTIVITY; CONCRETE; AGGREGATE; PREDICTION; PERCOLATION; MORTARS;
D O I：
10.1016/j.conbuildmat.2012.05.023
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Based on the cement particles distribution characteristic of interfacial transition zone (ITZ) in cement-based composite materials and modified powers model, a numerical calculation model is proposed to predict the porosity distribution, average porosity and effective diffusion coefficient of chloride ions in ITZ. The model takes into account the influence of water-to-cement ratio, the thickness of ITZ and the degree of hydration on the porosity distribution of ITZ. The results show that the ratio of the capillary porosity of ITZ to that of bulk cement paste (phi(ITZ)/phi(B)) and the ratio of the diffusion coefficients of chloride ions in ITZ to that in bulk cement paste (D-ITZ/D-B) are almost consistent with those in published papers. In addition, the results of numerical calculation further confirm the diffusion coefficient of ITZ is 10 times as much as that of bulk cement paste. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：134 / 138
页数：5
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