Retrofitting of concrete structures has recently become a major issue worldwide due to design errors, earthquake damages and the deterioration by the exposure to the harsh environmental conditions, in addition to increase of loads carrying capacity of the structures. CFRP composites have been used efficiently to strengthening of concrete structures using epoxy adhesives to increase the service life of structures and increasing the applied loads. However, the limitations of using epoxy resin only at low temperature below the glass transition temperature, has created a need to replace the epoxy adhesives with cementitious bonding materials to provide better resistance at high temperatures environments. This program assessed the bonding between near-surface mounted (NSM) carbon fibre reinforced polymer (CFRP) Laminate and concrete using modified cement–based adhesive at site exposure in high temperature environment. The study showed a significant resistance of modified cement adhesive as a bonding material at high temperature environment compared to epoxy adhesive.