The role of mortar matrix in the bond behavior and salt crystallization resistance of FRCM applied to masonry

•Brick masonry blocks were reinforced with FRCM composites.•Two different mortar matrices (natural hydraulic lime and Portland cement) were used.•Wetting-drying cycles in water and saline solution were carried out.•The bond behavior of FRCM-masonry joints and the materials deterioration were investigated.•The matrix played a key role in the debonding mechanism and in the salt crystallization pattern.