对流与扩散耦合作用下氯离子传输机理研究  被引量:5

Study on the chloride transport mechanism under the coupled action of convection and diffusion

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作  者:张明敏[1] 赵铁军[1] 万小梅[1] 马志鸣[1] 

机构地区:[1]青岛理工大学土木工程学院,山东青岛266033

出  处:《混凝土》2012年第10期32-35,共4页Concrete

基  金:国家重点基础研究发展计划(973计划)(2009CB623203)

摘  要:干湿循环作用下氯离子在混凝土中的传输过程实质上是非饱和状态下混凝土中水分渗流和氯离子传输的耦合作用。通过试验方案设计,先令氯离子在混凝土中一维扩散,进而在混凝土的氯盐暴露面的对立面进行吸水,使水在混凝土中朝着与氯离子扩散方向相反的方向传输,带动氯离子向相反方向迁移,进而得到氯离子分布曲线。通过与自由扩散下的氯离子分布曲线相对比,得出反向对流作用下氯离子在混凝土中的迁移规律。试验结果表明:由于对流作用,氯离子在混凝土试件浅层3 mm区域有一定的累积效应,但未出现明显峰值,且随着吸水时间的延长,这种效应在降低;在混凝土浅层6 mm区域内,对流作用对氯离子含量的影响高于自由扩散情况,但在混凝土内部较深区域,两者对氯离子含量的影响并无太大区别。The penetration model of chloride into concrete in dry-wet cycling zone is in fact the model coupling the infiltration flow of pore solution and the transportation of chloride ions e.g.diffusion coupling with convection.Take the effect of chloride migrate back to the original surface which caused by convection as the study site,design experiments contents,absorb water from the opposite of the surface which the salt entered,then water transmit in the concrete and drive the chloride ions migrate toward the proliferation opposite direction,to get the chloride distribution curve.Finally,take this curve compare with the distribution curve of chloride free diffusion,to find the chloride migration law in concrete.The experimental results showed that,due to convection,the chloride ion had the cumulative effects in the region of 3 mm in the concrete specimens,but had no peak.And with the prolongation of water-absorption time,this effect in reducing;compared with free diffusion,convection on the impact of the chloride ion content was higher in the region of 6 mm,but in the deep inside of the concrete,both of them had not much difference.

关 键 词:混凝土 氯离子 对流 扩散 耦合作用 

分 类 号:TU528.01[建筑科学—建筑技术科学]

 

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