Natural marine exposure results for reinforced concrete slabs with corrosion inhibitors |
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| Affiliation: | 1. Department of Chemical Engineering, University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3;2. Department of Civil Engineering, University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3;1. School of Planning, Architecture and Civil Engineering, Queen’s University Belfast, Belfast, UK;2. School of Civil Engineering, University of Leeds, England, UK;3. School of Energy, Geoscience, Infrastructure and Society, Heriot Watt University, Edinburgh, UK;4. Chalmers University of Technology, Gothenburg, Sweden;5. School of Civil and Structural Engineering, Dublin Institute of Technology, Dublin, Ireland;6. School of the Built Environment, University of Ulster, Newtownabbey, UK;1. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;2. Zhejiang YASHA Decoration Co., Ltd, Hangzhou 310008, China;3. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 300018, China;4. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;1. Department of Civil Engineering, Hannam University, Daejeon 306-791, Republic of Korea;2. Department of Architectural Engineering, Hanyang University, 1271 Sa 3-dong, Sangrok-gu, Ansan 426791, Republic of Korea;3. PG and Research Department of Chemistry, Alagappa Government Arts College, Karaikudi 630003, Tamil Nadu, India;4. Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India |
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| Abstract: | Reinforced concrete slabs were cast with a concrete cover of 20 mm. The water-to-cement ratio was 0.40, and the concrete slabs were either uncracked or precracked. A simulated crack 0.2 or 0.4 mm wide was formed transverse to the axis of the reinforcing bar during the casting. Two types of commercial corrosion inhibitors were added to concrete mixtures for corrosion protection. Slabs were placed about 1 m below high tide at the Treat Island, Maine, USA, natural marine exposure site. The specimens were visually inspected and the corrosion rates were measured annually using the linear polarization technique. Some of the concrete slabs were broken open after 12 months of exposure and corrosion damage was evaluated. Water-soluble chloride content analysis was performed at this time. After three years of exposure, it was found, that both corrosion inhibitors were effective in reducing the corrosion rate for uncracked concrete slabs, but relatively ineffective in preventing localised corrosion of reinforcing steel in the crack area for precracked concrete slabs. |
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