A Review on Concrete Structures Strengthened with CFRP Sheets Bonded with Organic and Inorganic Cementation Materials

Carbon fiber–reinforced polymer (CFRP) sheets have been widely applied in civil engineering, and the bonded materials are important components in the practical strengthening process. Presently, epoxy adhesive is the most widely used cementation material, but the inorganic materials are developing rapidly. This article reviews the taxonomy and origin of cementation material used in civil engineering as structural adhesives to create the bond between CFRP and summarizes the properties of epoxy adhesive, alkali-activated cementing material, magnesium oxychloride cement, and cement-based composite material. The conclusion shows that using an inorganic adhesive as a binder can fix the temperature problems of organic materials and improve the bearing capacity of reinforced concrete structures. At present, the inorganic adhesive also has weaknesses, which indicates the future research directions.