Externally bonded reinforcement in grooves (EBRIG) technique to postpone debonding of FRP sheets in strengthened concrete beams

Experimental investigation into bond behavior of CFRP sheets attached to concrete using EBR and EBROG techniques

“…Based on their experimental study, using vertical grooves as a substitute to conventional EBR technique prior to shear strengthening of beams by CFRP sheets changed the failure mode from shear to flexural and increased ultimate load capacity of the beams up to 15 percent compared to EBR strengthened specimens; while no debonding was reported in CFRP shear reinforcements [29]. More recently, another technique for GM was introduced and named as externally bonded reinforcement in grooves (EBRIG), in which the FRP is formed in contact with the surfaces of the grooves using wet layup procedure [30].…”

Strengthening of RC columns by longitudinal CFRP sheets: Effect of strengthening technique

“…In order to prevent debonding of tensile composite from concrete substrate in beams flexurally strengthened with FRP, grooving method (GM) has been introduced by Mostofinejad et al [12][13][14][15] as a substitute for conventional EBR. Mostofinejad and Mahmoudabadi [12] introduced a technique of GM which was later named as externally bonded reinforcement on grooves (EBROG).…”

Reviewing the FRP Strengthening Systems

“…Due to the fact that EBRIG technique provides larger contact area between FRP and the underlying concrete layer compared to EBROG method, this technique significantly promote the structural performance, modify crack initiation and propagation, and increase the failure limits. Based on their result the EBRIG method is effective than EBROG and EBR method when multilayer FRP sheet are used [9].…”

“…Mostofinejad and Shameli [9] invented an improved grooving method by penetrating the FRP sheets used in the EBROG method into the grooves. This technique was named Externally Bonded Reinforcement In Grooves (EBRIG) method.…”