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Journal of Korean Society of Coastal and Ocean Engineers > Volume 30(6); 2018 > Article
J Korean Soc Coast Ocean Eng 2018;30(6): 298-305. doi: https://doi.org/10.9765/KSCOE.2018.30.6.298
수중코팅제와 콘크리트 모재 간의 인장 부착 특성
김민욱1, 정연웅2, 강성훈2, 문주혁2, 이진학1
Tensile Bond Characteristics between Underwater Coating Materials and Concrete Substrate
Min Ook Kim1, Yeonung Jeong2, Sung-Hoon Kang2, Juhyuk Moon2, Jin-Hak Yi1
1Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology
2Department of Civil and Environmental Engineering, Seoul National University
Corresponding author: Min Ook Kim ,Tel: +82-51-664-3520, Email: minookkim@kiost.ac.kr
Received: November 29, 2018;  Revised: December 23, 2018.  Accepted: December 24, 2018.
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ABSTRACT
In this study, we investigated the tensile bond characteristics of underwater coating materials, in order to obtain useful information in support of repair work for marine and coastal concrete structures. Test variables included type of underwater coating, surface conditions of the concrete substrate, and environmental conditions. Pull-off tensile bond strength was measured at 24 h after applying underwater coatings to concrete substrates, in compliance with the procedures specified in ASTM C1583. Failure modes (coating, interface, and parent concrete) for each coating were identified through visual inspection, and comparisons were made based on measured bond strength. The tensile bond strength decreased underwater compared to that under dry conditions, while no significant effect of surface roughness on the measured bond strength was observed in underwater tests. Key aspects that need to be considered regarding selection and use of underwater coating materials for marine and coastal concrete structures were discussed.
Keywords: concrete substrate, underwater coating material, tensile bond strength
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