Calculation of chloride ion diffusion in glass and polypropylene fiber-reinforced concrete
Calculation of chloride ion diffusion in glass and polypropylene fiber-reinforced concrete
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DOI：
10.1016/j.conbuildmat.2019.04.246
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发表时间：
2019-08-10
影响因子：
7.4
通讯作者：
Wang, Jun
中科院分区：
文献类型：
--
作者：
Liu, Jinliang;Jia, Yanmin;Wang, Jun
提出了一个数值模型来预测氯离子扩散到纤维增强混凝土中。纤维混凝土的渗透性计算为总孔隙率的函数，考虑了骨料和纤维周围的界面过渡区空隙以及由于添加纤维而导致的空隙之间的连接。根据菲克第二定律，建立了氯离子扩散模型，并采用有限差分法求解。对玻璃纤维、聚丙烯纤维和混合纤维混凝土进行了氯离子扩散试验，这些试验结果和收集的试验数据用于验证数值模型。最后对数值模型的敏感性进行了分析，结果表明，纤维直径、纤维体积分数、骨料直径和骨料体积分数四个因素对纤维混凝土中氯离子扩散过程有显着影响。 (C) 2019 Elsevier Ltd. 保留所有权利。
A numerical model was proposed to predict the diffusion of chloride ions into fiber-reinforced concrete. The permeability of fiber-reinforced concrete was calculated as function of total porosity, which considered the interfacial transition zone voids around aggregate and fibers as well as the connection between voids due to the addition of fibers. Based on Fick's second law, a diffusion model for chloride ions was established and solved by the finite difference method. The chloride ion diffusion tests of glass fiber, polypropylene fiber, and hybrid fiber-reinforced concrete was conducted, these experimental results and collected test data were used to validate the numerical model. Finally, the sensitivity of the numerical model was analyzed, and the results indicated that the four factors, including fiber diameter, volume fraction of fibers, aggregate diameter and volume fraction of aggregates, significantly influence the process of chloride diffusion in fiber-reinforced concrete. (C) 2019 Elsevier Ltd. All rights reserved.