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骨料对氯离子在水泥基复合材料中扩散系数的影响
作者:孙国文 孙伟 张云升 刘志勇 王彩辉 
单位:江苏省土木工程材料重点实验室 东南大学 南京 211189 
关键词:骨料 水泥基复合材料 氯离子 扩散系数 界面区 模型 
分类号:TQ528
出版年,卷(期):页码:2011,39(4):110-117
DOI:
摘要:

为了确定骨料对氯离子在水泥基复合材料中扩散系数的影响,利用压汞技术和稳态电迁移法分别对含不同类型、不同粒径分布、不同体积分数骨料的砂浆和混凝土试样,进行了孔结构和氯离子扩散系数的测试,并根据试样配合比、骨料的粒径分布以及界面过渡区(简称界面区)厚度进行了界面区体积分数计算,最后提出了界面区有效扩散系数的预测模型。结果表明:氯离子在水泥基复合材料中的扩散系数由基体扩散系数、界面区扩散系数、骨料以及界面区的体积决定,而界面区的体积分数主要取决于骨料的粒径分布、骨料体积和界面区厚度;骨料改变了水泥基复合材料中浆体的孔结构,其稀释效应和曲折效应降低了氯离子的传输性能;界面区特殊的微观结构增加了传输性能,其中,界面区效应要大于其曲折和稀释效应。根据试验结果采用回归分析法,得到氯离子在砂浆和混凝土界面区的扩散系数分别是基体的13.26倍和18.45倍。

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To determine the influence of aggregates on chloride ion diffusion coefficient in cement-based composite materials, mortar and concrete specimens were cast with different aggregates, aggregate size distributions and aggregate volume fractions. Pore size distributions and chloride ion diffusion coefficients of the specimens were measured by mercury intrusion porosimetry test and steady-state accelerated migration test, respectively. The volume fraction of interfacial transition zone (ITZ) could be calculated according to the mix proportions of specimens, size distribution of aggregates and ITZ thickness. The results show that the chloride diffusivity in cement-based composite materials is related to the chloride diffusion coefficient of matrix and ITZ, volume fraction of aggregate and ITZ. The volume fraction of ITZ is affected by the aggregate size distribution, the volume fraction of aggregate and thickness of ITZ. The presence of aggregates in cement-based materials might modify the pore structure of hardened cement paste, and its dilution effect and tortuosity effect could reduce chloride transport properties. The special microstructures of ITZ could increase chloride transport. The influence of ITZ could be dominant to chloride diffusion in cement-based materials. Based on the experimental and analytical results, the approximate chloride ion diffusion coefficient of ITZ is 13.26 or 18.45 times greater than the matrix migration coefficient for mortar or concrete, respectively.

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基金项目:
国家“973”计划(2009CB623200);国家“863”(2008AA030794)计划资助项目。
作者简介:
博士研究生
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参考文献:

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