Abstract
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.
Highlights
The corrosion of steel in concrete is primarily due to the ingress of the chloride ion, especially in marine environments [1]
The distribution law of chloride ions and microstructural characteristics in concrete treated with two types of migration conditions, electric field conditions versus natural immersion conditions, were two types of migration conditions, electric field conditions versus natural immersion conditions, compared, giving insight into the effects of different chloride migration modes on the distribution law were compared, giving insight into the effects of different chloride migration modes on the and microstructural characteristics
The main conclusions are as follows: (1) Chloride ion ingress into concrete can change the pore structure of the concrete
Summary
The corrosion of steel in concrete is primarily due to the ingress of the chloride ion, especially in marine environments [1]. The results can be used to rate the resistance ability of reinforced concrete against chloride ion corrosion, which is very useful for concrete structural design and material selection. These parameters can be used to predict the service life of new and existing buildings. Natural immersion and electric field acceleration are the two experimental methods for studying the migration of chloride ions in concrete [3,4,5]. Compared with electric field acceleration, natural immersion more closely resembles reality, so the migration coefficient is of higher practical relevance [8]
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