Corrosion resistance of quenched steel rebar
Corrosion of steel rebar is a major and very costly form of durability problem that threatens the performance of reinforced concrete structures, especially in an environment characterized with severe environmental conditions such as in the Arabian Gulf. Corrosion of reinforcing steel usually leads t...
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| Format: | Dissertation |
| Language: | English |
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ProQuest Dissertations & Theses
01-01-2015
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| Online Access: | Get full text |
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| Summary: | Corrosion of steel rebar is a major and very costly form of durability problem that threatens the performance of reinforced concrete structures, especially in an environment characterized with severe environmental conditions such as in the Arabian Gulf. Corrosion of reinforcing steel usually leads to spallation of the concrete layer which shortens the lifespan of structures. This type of deterioration is principally attributed to de-passivation of the rebar steel due to chloride ions that might be contributed by the mix ingredients or diffused from the service environment. The focus of this study is to investigate and compare the corrosion resistance of quenched steel rebar with air cooled steel rebar. The study was conducted in two parts. In the first part, mechanical tensile properties and corrosion resistance of quenched and air-cooled steel rebars obtained from various suppliers in the local market were characterized. The second part focused on investigating the corrosion resistance of different steel rebars microstructures that are produced by heat treatment encountered in steel rebar plants. The results indicate that the corrosion resistance of quenched and tempered microstructure is higher than bainite and perlite microstructures for the same steel composition. Tempering rebar sample at 400°C showed higher corrosion resistance than tempering at 300°C. |
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| ISBN: | 9780355572032 0355572036 |