Bond behavior of FRP composites attached to concrete using EBROG method: A state-of-the-art review

•The papers on the FRP-concrete bond via the EBROG method are reviewed.•The efficiency of EBROG method compared to the EBR method is affirmed.•The behavior of EBROG joints is discussed.•The influential parameters on the performance of EBROG method are evaluated. During the last decade, the externally bond reinforcement on grooves (EBROG) method has been introduced as a technique in the external strengthening of reinforced concrete (RC) members with fiber reinforcement polymer (FRP) composites. This method can postpone or eliminate premature debonding. Hence, the study of the EBROG bond has attracted a lot of attention, which is accomplished through lap shear tests. The present study aimed to review the previous studies conducted for evaluating and analyzing the influential parameters, and compare the EBROG and externally bonded reinforcement (EBR) methods. The EBROG method could considerably improve the bond behavior between FRP composites and the concrete substrate based on the results. Besides, 24.0% and 14.0% of all the EBROG bonds experienced FRP rupture mode and a combination of FRP rupture and debonding at the FRP-adhesive interface over the grooves, respectively. Further, the influence extent of a parameter relied on the values of other parameters, while the optimum values for some parameters were identified.