In order to improve the bonding strength between FRP sheets and concrete, the FRP sheets bonding method using high elongation elastic resin as a buffer layer was developed. In this study, bonding tests was conducted using polyurea resin as the high elongation elastic resin and FRP strand sheets as the FRP sheets. As a result of the bonding test, it was found that the use of the polyurea resin as a buffer layer significantly improved the bonding strength and the interfacial fracture energy between FRP sheets and concrete with polyurea. In addition, bond stress-slip relationships with a polyurea resin were proposed. Finally numerical analyses of bonding CFRP sheets and concrete were conducted to verify validity of the proposed bond stress-slip relationships.
