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Computers and Concrete Volume 19, Number 4, April 2017 , pages 339-346 DOI: https://doi.org/10.12989/cac.2017.19.4.339 |
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Experimental study on durability of strengthened corroded RC columns with FRP sheets in tidal zone of marine environment |
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Amin Kashi, Ali Akbar Ramezanianpour and Faramarz Moodi
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| Abstract | ||
| The main objective of this paper was to illuminate the effect of marine environmental condition on durability of reinforced concrete (RC)-corroded columns strengthened with carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) layers. Small-scale columns were prepared and corroded by an accelerated corrosion process. After strengthening, compressive strength tests were carried out on control and weathered specimens. In this research, a marine simulator was designed and constructed similar to the tidal zone of marine environment in south of Iran which was selected as a case study in this research. Mechanical properties of wrapped specimens were studied after placing them inside the simulator for 3000 hours. Marine environment decreased ultimate strength by 4.5% and 26.3% in CFRP and GFRP-wrapped columns, respectively. In some corroded-columns, strengthening was carried out after replacing damaged cover by self-compacted mortar. In this method, by confining with one layer of CFRP and GFRP, 4.2% and 22.4% reduction in ultimate strength was observed, respectively, after exposure. Furthermore, the elastic-brittle behavior has been verified in this retrofit method. Also results of tension tests revealed, the ultimate tensile strength was degraded by 2% and 28.8% in CFRP and GFRP sheets, respectively, after applying marine exposure. | ||
| Key Words | ||
| FRP sheets; marine exposure; corroded columns; strengthening; durability | ||
| Address | ||
| Amin Kashi and Ali Akbar Ramezanianpour: Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran Faramarz Moodi: Department of Civil and Environmental Engineering, Concrete Technology and Durability Research Center (CTDRc), Amirkabir University of Technology, Tehran, Iran | ||