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.
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References
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Acknowledgements
We received cooperation in this study from HACHIYO Consultant Co., Ltd. and from Yusuke Usui, a Tokyo City University student writing a graduation thesis at the time. We would like to thank everyone involved. This research was carried out with the support of a JSPS Grant-in-Aid for Scientific Research (16K0659, 19K04695).
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Sato, S., Kakegawa, M., Masuda, Y. (2023). An Evaluation of Chloride Ion Penetration of Reinforced Concrete with Surface Coating Materials Exposed for 25 Years Under Coastal Environments. In: Reddy, J.N., Wang, C.M., Luong, V.H., Le, A.T. (eds) ICSCEA 2021. Lecture Notes in Civil Engineering, vol 268. Springer, Singapore. https://doi.org/10.1007/978-981-19-3303-5_30
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DOI: https://doi.org/10.1007/978-981-19-3303-5_30
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