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Performance of the Pre-Damaged Reinforced Concrete Beam Repaired using CFRP and Epoxy Injection


The performance of the pre-damaged reinforced concrete (RC) beam repaired with carbon fiber reinforced polymer (CFRP) and epoxy injection in terms of bearing capacity, strength effectiveness, cracking mode and ductility is of great importance to be studied. This is because a suitable repair technique is required for the concrete structure. Therefore, the effects of different repair techniques on the behavior of pre-damaged reinforced concrete beams under monotonic loading to failure are investigated in this paper. Five types of beams were prepared, namely control beam (S1C), control beam reinforced with carbon fibre reinforced polymer (CFRP) at soffit (S2B), pre-damaged RC beam repaired with epoxy injection and reinforced with CFRP at soffit (S3B), pre-damaged RC beam repaired with epoxy injection (S4B) and pre-damaged RC beam strengthened with CFRP (S5B). The bearing load capacity, strength effect, failure mode and ductility were observed, analyzed and discussed. It is found that the repaired beams associated with CFRP increase the bearing load capacity up to 37.24% and strength effectiveness up to 40%. However, the ductility is lower compared to the reference beam. Therefore, it can be concluded that the pre-damaged beam RC, repaired with a combination of epoxy injection and CFRP is a good repair method. This study is very useful for the real application of the method for repair and maintenance purposes.

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The authors thank the Faculty of Civil Engineering, Universiti Teknologi MARA, Cawangan Pulau Pinang for providing the financial support in terms of allocation of materials for this research. The authors would like to also thank the top management of Universiti Teknologi MARA for the fee payment of this paper. The authors would like to thank Muhammad Zul Naim A.N., Abdul Hassim W.A., Muhamad Faizol A.R., Ahmad Firdaus M. and all assistant engineers who involved in this research.

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Correspondence to N. Md Nor.

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This article is an invited paper selected from presentations at the 5th Symposium on Damage Mechanism in Materials and Structures (SDMMS 20–21), held March 8–9, 2021 in Penang, Malaysia and has been expanded from the original presentation.

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Md Nor, N., Mat Saliah, S.N. & Yahya, N.A. Performance of the Pre-Damaged Reinforced Concrete Beam Repaired using CFRP and Epoxy Injection. J Fail. Anal. and Preven. (2021).

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  • Carbon Fiber Reinforced Polymer
  • Acoustic Emission
  • Epoxy Injection
  • Ductility
  • Bearing Load Capacity
  • Failure mode
  • Pre-Damaged Beam