Effect of the Electric Field on the Distribution Law of Chloride Ions and Microstructure in Concrete with the Addition of Mineral Admixtures

被引:5
作者
Xie, Xiaoli [1 ]
Feng, Qingge [2 ]
Chen, Zheng [3 ]
Lu, Wei [1 ]
机构
[1] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China
[2] Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China
[3] Guangxi Univ, Sch Civil Engn & Architecture, China Minist Educ, Key Lab Disaster Prevent & Struct Safety, Nanning 530004, Peoples R China
来源
MATERIALS | 2019年 / 12卷 / 09期
基金
中国国家自然科学基金;
关键词
concrete; chloride; electric field; natural immersion; microstructure; BINDING-CAPACITY; DIFFUSION-COEFFICIENTS; MIGRATION TEST; TIME; CORROSION; STEADY; MORTAR; STEEL; AGGREGATE; TRANSPORT;
D O I
10.3390/ma12091380
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Migration testing of chloride under an electric field is a fast and effective method to determine the corrosion resistance of reinforced concrete against chloride. In this study, a series of admixture-involved (fly ash and slag) concrete specimens were produced for an accelerating chloride diffusion test in 3% NaCl solution under an electric field and natural chloride diffusion in 165 g/L NaCl solution under immersion conditions. Then, the chloride profile and pore structure of concretes aged 56 and 91 days were compared to investigate the effect of the electric field on chloride diffusion as well as the microstructure of the concrete. The results showed that, under accelerating electric field conditions, the degree to which chloride refined the internal pore structure of the concrete was weaker than that under natural immersion conditions. The applied electric field changed the pore structure inside the concrete, but it had little effect on the distribution of total, free, and bound chlorides and their mutual relationship. In addition, it is necessary to consider that the electric field effect on chloride migration varies with the concrete mix proportions.
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页数:17
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