Effect of Calcium Leaching on Chloride Penetration Resistance of Concrete

被引：0
|
作者：
Wang, Shaowei [1 ]
Xiao, Yanyu [1 ]
Zhu, Pinghua [1 ]
Yan, Xiancui [1 ]
Xia, Qun [1 ]
机构：
[1] School of Urban Construction, Changzhou University, Jiangsu, Changzhou
来源：
Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 16期
基金：
中国国家自然科学基金;
关键词：
acceleration effect; calcium leaching; chloride penetration; concrete;
D O I：
10.11896/cldb.23020121
中图分类号：
学科分类号：
摘要：
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. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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