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Erschienen in:
2023 | OriginalPaper | Buchkapitel
An Evaluation of Chloride Ion Penetration of Reinforced Concrete with Surface Coating Materials Exposed for 25 Years Under Coastal Environments
verfasst von : Sachie Sato, Masaru Kakegawa, Yoshihiro Masuda
Erschienen in: ICSCEA 2021
Verlag: Springer Nature Singapore
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Abstract
In this study, reinforced concrete specimens with three surface coating materials were exposed to a coastal environment for 25 years to investigate their long-term durability and salt penetration control effect. The specimens were fabricated simultaneously and analyzed at 4.8 years and eight years. The exposure tests are conducted in the coastal area of Hokkaido, in northern Japan, at 40 m from the coastline, and the annual chloride ion flux is 7.1 mg/dm2/day on the seaward side of specimens. Chloride ions that penetrated the concrete are analyzed by potentiometric titration to determine the number of chloride ions and the penetration depth. We compared the amount of chloride ion penetrating to each material used for repairing and coating. The change in the shielding effect of the surface coating materials is also determined based on the change over time from the past experimental results. As a result, the coating material S (multi-layer textured coat) has the most practical effect on preventing chloride ion penetration.