钙溶蚀对混凝土抗氯离子侵蚀性能的影响

doi:10.11896/cldb.23020121

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Abstract Concrete structures such as concrete-faced rockfill dams and underwater tunnels are prone to calcium leaching due to water leakage, and will face durability issues under the coupled effects of calcium leaching and chloride penetration in complex water environments. To quantify the effect of calcium leaching on chloride penetration resistance of concrete in complex water environment, accelerated coupling corrosion tests, which were implemented by chemical solution immersion method for concrete with different water-cement ratio, were carried out to study the evolution of evaluation indexes of leaching and chloride diffusion, and microscopic mechanism was explored. The results showed that the chloride diffusion coefficient and chloride content of completely leached concrete were about 3.5 times and 1.3—2.0 times of those before leaching, respectively. The chloride diffusion coefficient decreased linearly from outside to inside in the leached zone, but the increasing rate of chloride content increased with the depth. The chloride ions adsorption capacity of leached concrete was significantly enhanced and still followed the linear adsorption model. The leaching resistance and chloride penetration resistance of ordinary cement-based concrete both decreased with the increase of water-cement ratio.

Key words： concrete calcium leaching chloride penetration acceleration effect

Published: 25 August 2024 Online: 2024-09-10

CLC number:

TU528.01

Fund:National Natural Science Foundation of China (52278240) and Hunan Provincial Natural Science Foundation (2020JJ5317).

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	Articles by authors
	WANG Shaowei
	XIAO Yanyu
	ZHU Pinghua
	YAN Xiancui
	XIA Qun

Cite this article:

WANG Shaowei,XIAO Yanyu,ZHU Pinghua, et al. Effect of Calcium Leaching on Chloride Penetration Resistance of Concrete[J]. Materials Reports, 2024, 38(16): 23020121-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23020121 OR http://www.mater-rep.com/EN/Y2024/V38/I16/23020121

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