FRPmasonry
systems were presented in this paper. Accelerated ageing tests were performed on the GFRPstrengthened brick specimens. Two different hygrothermal environmental conditions were considered called HT and FT exposures. HT exposure consisted of 6 hr temperature cycles between +10̊C to +50̊C (90% R.H.), while the temperature change in FT was between -10̊C to +30̊C. Post-ageing tests were performed on the specimens after each 50 cycles of exposure to study the changes in the bond behavior. The post-ageing tests consisted of visual inspection and single-lap shear bond tests.Progressive FRP delaminations were observed in the specimens after exposure to hygrothermal conditions which can be attributed to the thermal incompatibility between epoxy resin and masonry substrate. Moreover, it was observed that the bond strength and stiffness decreased with time due toexposure conditions.