There is significant concern in the engineering community regarding the safety and effectiveness of fiber-reinforced\r\npolymer (FRP) strengthening of RC structures because of the potential for brittle debonding failures. In this paper, previous\r\nresearch programs conducted by other researchers were reviewed in terms of the debonding failure of FRP laminates externally\r\nattached to concrete. This review article also discusses the influences on bond strength and failure modes as well as the existing\r\nexperimental research and developed equations. Based on the review, several important conclusions were re-emphasized, including\r\nthe finding that the bond transfer strength is proportional to the concrete compressive strength; that there is a certain bond\r\ndevelopment length that has to be exceeded; and that thinner adhesive layers in fact lower the chances of a concrete-adhesive\r\ninterface failure. It is also found that there exist uncertainty and inaccuracy in the available models when compared with the\r\nexperimental data and inconsistency among the models. This demonstrates the need for continuing research and compilation of\r\ndata on the topic of FRP�s bond strength.
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