Effects of Solution Concentration and Composition on the Transport Rate of Chloride Ions in Cracks
GU Chunping1,2,3, YAO Chengyang1, CHEN Shilong1, WANG Qiannan4,*
1 College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China 2 Key Laboratory of Civil Engineering Structures and Disaster Prevention and Mitigation Technology of Zhejiang Province, Hangzhou 310023, China 3 Zhejiang Construction Investment Group Co., Ltd., Hangzhou 310013, China 4 School of Civil Engineering and Architecture, Zhejiang University of Science & Technology, Hangzhou 310023, China
Abstract: Cracks are channels for the rapid transport of chloride ions in concrete, which have significant influences on concrete durability. The nature of the solution in crack is one of the main factors affecting the transport rate of chloride ions. In order to exclude the influence of the crack morphology, this study prefabricated plexiglass and cement paste straight cracks, and designed the steady-state chloride transport test in cracks. The effects of solution concentration (2%, 3.5%, 5%, 7.5%, 10% NaCl solution) and composition (3.5% NaCl solution, artificial seawater and real seawater) on chloride transport rate in cracks were studied. The results showed that the chloride transport rate in plexiglass and cement paste straight cracks with same crack width were similar. As the crack width increased, the chloride ion diffusion coefficient in crack increased. When the crack width increased from 30 μm to 300 μm, the chloride ion diffusion coefficient in crack increased significantly. When the crack width was larger, the chloride ion diffusion coefficient increased relatively slowly; with the increase of NaCl solution concentration, the chloride ion diffusion coefficient in cracks gradually increased, and the larger the crack width, the more significant the influence of NaCl solution concentration. When the crack width was smaller than 115 μm, the results of tests performed with 3.5% NaCl solution and artificial seawater were similar to that with the real seawater; when the crack width was greater than 115 μm, the results of tests with 3.5% NaCl solution were relatively higher, while the results of the tests with artificial seawater were similar to those with real seawater.
通讯作者: *王倩楠,通信作者,浙江科技学院副教授、硕士研究生导师。2008年和2018年于东南大学材料科学与工程专业本科毕业和博士毕业。2018年起在浙江科技学院土木与建筑工程学院工作至今。主要从事土木工程材料耐久性、古建筑修复材料等方面的研究工作。发表论文20余篇,包括Cement and Concrete Composites、Materials and Structures等。wangqiannan@zust.edu.cn
作者简介: 顾春平,浙江工业大学土木工程学院校聘副教授、副研究员、硕士研究生导师。2008年和2016年于东南大学材料科学与工程专业本科毕业和博士毕业。2016年起在浙江工业大学土木工程学院工作至今。目前主要从事土木工程材料耐久性与体积变形、固废建材化利用、绿色建材等方面的研究工作。发表论文30余篇,包括Journal of Cleaner Production、Construction and Building Materials等。
引用本文:
顾春平, 姚程阳, 陈士龙, 王倩楠. 溶液浓度与组成成分对氯离子在裂缝中传输速率的影响[J]. 材料导报, 2024, 38(19): 22100103-7.
GU Chunping, YAO Chengyang, CHEN Shilong, WANG Qiannan. Effects of Solution Concentration and Composition on the Transport Rate of Chloride Ions in Cracks. Materials Reports, 2024, 38(19): 22100103-7.
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2024, Vol. 38 
