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Title |
Quantitative Assessment for Durability of Concrete in the Treatment of Silane-Based Water Repellent Agent (WRA) on Mortar Surface
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Authors |
이창근(Chang Gun Lee) ; 안기용(Ki Yong Ann) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.2.251 |
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Keywords |
발수제; 탄산화; 철근부식; 공극구조; 염해 water repellent agent (WRA); carbonation; steel corrosion; pore structure; chloride attack |
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Abstract |
This study presents a quantitative assessment of the durability of concrete treated with a commercial water-repellent agent. Additionally, the compatibility of the water-repellent agent was examined in terms of concrete strength, cost efficiency, durability, environmental impact, long-term feasibility, and constructability. Mortar specimens were prepared with a cement-water- sand ratio of 1.00:0.50:2.50, and a silane-based water-repellent agent was applied to the surface twice. It was found that the water-repellent agent enhanced carbonation resistance by over 60 %, meaning that the time required for carbonation to reach a certain depth increased by at least sixfold. Regarding chloride-induced corrosion, the onset of corrosion occurred between 12 and 22 weeks. In contrast, specimens treated with the water-repellent agent exhibited delayed corrosion initiation at 22 and 24 weeks, with two specimens showing no signs of corrosion even after 26 weeks of monitoring. Furthermore, the water-repellent agent refined the pore structure, leading to a densification of capillary pores in the range of 500?1,000 nm.
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