溶液浓度与组成成分对氯离子在裂缝中传输速率的影响

doi:10.11896/cldb.22100103

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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.

Key words： chloride crack width diffusion coefficient transport rate

Published: 10 October 2024 Online: 2024-10-23

CLC number:

TU528

Fund:National Natural Science Foundation of China (52378272,52008372) and the Natural Science Foundation of Zhejiang Province (LY22E080014).

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	GU Chunping
	YAO Chengyang
	CHEN Shilong
	WANG Qiannan

Cite this article:

GU Chunping,YAO Chengyang,CHEN Shilong, et al. Effects of Solution Concentration and Composition on the Transport Rate of Chloride Ions in Cracks[J]. Materials Reports, 2024, 38(19): 22100103-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22100103 OR http://www.mater-rep.com/EN/Y2024/V38/I19/22100103

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