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The effect of w/c ratio and aggregate volume fraction on chloride penetration in non-saturated concrete

机译：w / c比和骨料体积分数对非饱和混凝土中氯离子渗透的影响

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The diffusion of moisture and chloride in non-saturated concrete is considered as two coupled transport processes. Two coupling terms are added in the governing equations based on Fick's first law to represent the interaction between the moisture and chloride during the transport processes. The first coupling term is for the effect of moisture movement on chloride transfer, and the other is for the effect of chloride transfer on moisture movement. In this paper, an experimental study was conducted to investigate the effect of the variation of the water-cement ratio and the aggregate volume fraction on the coupling parameter associated with the first coupling term (DCl-H). To this end, a chloride ponding test was designed and performed on two sets of fully and partially saturated concrete samples made with different water-cement ratios and aggregate volume fractions. The coupling parameter was determined based on the obtained test data. The results indicate that the coupling parameter Da_H is strongly dependent on the concentration of chloride ions, water to cement ratio, and volume fraction of aggregate. A material model for the coupling parameter was developed using the experimental results. (C) 2018 Elsevier Ltd. All rights reserved.
机译：水分和氯化物在非饱和混凝土中的扩散被认为是两个耦合的运输过程。在基于Fick第一定律的控制方程式中添加了两个耦合项，以表示运输过程中水分和氯化物之间的相互作用。第一个耦合项是关于水分迁移对氯化物迁移的影响，另一个是关于氯化物迁移对水分迁移的影响。在本文中，进行了一项实验研究，以研究水灰比和总体积分数的变化对与第一耦合项（DCl-H）相关的耦合参数的影响。为此，设计了氯离子沉陷试验，并对两组具有不同水灰比和骨料体积分数的完全饱和和部分饱和的混凝土样品进行了试验。基于获得的测试数据确定耦合参数。结果表明，耦合参数Da_H很大程度上取决于氯离子的浓度，水灰比和集料的体积分数。利用实验结果建立了耦合参数的材料模型。 （C）2018 Elsevier Ltd.保留所有权利。

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