Bond Failure Mode of NSM FRP Bar to Concrete Bridge Structure

Fiber Reinforced Polymer (FRP) reinforcement Near-surface mounted (NSM) is emerging as a promising technique for the strengthening of concrete bridge structure. The effect of bond length and groove width on bond failure mode, ultimate load is examined based on NSM bond tests. The ultimate load increases with bond length, average bond strength decreases with bond length. The ultimate load increases with the groove width. The interface between GFRP bar and resin failures, concrete surrounding the resin splits as the bond length is small. The resin near the concrete surface splits along the GFRP bar as the bond length is large.