Adhesion problems between FRP reinforcement and masonry support in existing building strengthening

The key factor for evaluating mechanical behaviour in masonry reinforced with composite materials is the bond strength between composite material and masonry. In this paper, the said strength was tested using shear test on brick reinforced with CFRP (Carbon Fiber Reinforced Polymer) of varying dimensions. The results made it possible to point out the influence played by the dimensions of the reinforcement sheet on the collapse load, ultimate slip, quality of the load-displacement diagram, and collapse modes. Lastly, identification of the local strains along the reinforcement sheet enabled us to formulate hypotheses regarding the local bond-slip relationship and then on the transfer mode of the stresses from the reinforcement to the brick