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Structural Engineering and Mechanics Volume 82, Number 2, April25 2022 , pages 163-172 DOI: https://doi.org/10.12989/sem.2022.82.2.163 |
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Flexural performance of RC beams incorporating Zinc-rich and epoxy bonding coating layers exposed to fire |
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Dina E. Tobbala, Ahmed S. Rashed and Bassam A. Tayeh
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| Abstract | ||
| Zinc-rich epoxy (ZRE) is used to overcome corrosion problems in reinforced concrete (RC) beams and coat steel rebars to protect them from humidity and chlorides. An extra coating layer of Sikadur-31 epoxy (SDE) is utilised to increase bond strength because the use of ZRE reduces the bond strength between concrete and steel rebars. However, the low melting point of SDE indicates that concrete specimens are vulnerable to fire. An experimental investigation on flexural performance of RC beams incorporating ZRE-SDE coating of steel rebars that were destroyed by fire is performed in this study. Twenty beams of five concrete mixes with different cementitious contents were tested to compare fire exposure for coated and uncoated rebars of the same beams at room temperature and determine the optimal cementitious content. Scanning electron microscopy (SEM) was also applied to investigate characteristics of fired mixture samples. Results showed that the use of SDE-ZRE at room temperature improves flexural strengths of the five mixes compared with uncoated rebars with percentages ranging from 8.5% to 12.3%. All beams with SDE-ZRE lost approximately 50% of their flexural strength due to firing. Moreover, the mix incorporating SF (silica fume) of 15% and cement content of 400 kg/m3 introduces optimum behaviour compared with other mixes. All results were supported and verified by the SEM analysis and compressive strength of cubic specimens of the same mixes. | ||
| Key Words | ||
| epoxy resin bonding agent; fire resistance; flexural strength; RC beams; Zinc-rich | ||
| Address | ||
| Dina E. Tobbala: Department of Civil and Architecture Constructions, Suez University, Egypt Ahmed S. Rashed: Department of Physics and Engineering Mathematics, Faculty of Engineering, Zagazig University, Egypt; Faculty of Engineering, Delta University for Science and Technology, Gamasa, Egypt Bassam A. Tayeh: Department of Civil Engineering, Faculty of Engineering, Islamic University of Gaza, P.O. Box 108, Gaza Strip, Palestine | ||