矿物掺合料对除冰盐环境下混凝土氯离子扩散中劣化效应系数的影响

作者：陈浩宇 李俊毅 陈蔚凡

单位：中交天津港湾工程研究院有限公司 中交天津港湾工程研究院有限公司 中交天津港湾工程研究院有限公司 天津300222 天津300222 天津300222

关键词：高强混凝土(HSC)  高性能混凝土(HPC)  除冰盐环境  劣化效应系数

分类号：TV431

出版年,卷(期):页码：2007,31(6):36-38

摘要：

采用化学分析方法,测定了高强混凝土(HSC)和高性能混凝土(HPC)在3种氯盐环境中的自由氯离子分布规律。根据F ick第二扩散定律和相关公式计算了混凝土中氯离子扩散的劣化效应系数(K)。结果表明:在除冰盐环境下,不掺掺合料的HSC存在劣化现象;掺加粉煤灰(FA)的HPC不存在劣化现象;掺加硅灰(SF)能减小混凝土的劣化程度,掺量为5%时效果最佳;双掺硅灰和粉煤灰(SF+FA)的HPC不存在劣化现象。

The distributive law of free chloride ion of high strength concrete(HSC)and high performance concrete(HPC)were determined by use of the method of chemical analysis in three kinds of de-icing salt environments.The degradation index(K)of chloride ion diffusion of concrtet was calculated according to the second Fick diffusion law and correlation formula.The results show HSC without admixtrues has degradation phenomenon,and there is no degradation phenomenon in HPC mixed with fly ash(FA).The degradation degree of concrtet can be reduced by mixing silica fume(SF),the mix ratio of 5% is best.There is no degradation phenomenon in HPC mixed with silica fume and fly ash.

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参考文献：

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