Punching behavior of strengthened and repaired RC slabs with CFRP

This study investigated the punching behavior of reinforced concrete slabs strength with carbon-fiber-reinforced polymer (CFRP). We tested a total of thirteen RC slabs, each having 965 mm length, 680 mm width, and 60 mm thickness, each slab was reinforced with two layers of CFRP of area (40 × 40 cm2). The variables in the experimental program were: pre loading (60% and 80%) of ultimate load (load of control slab) and orientation of the fiber of CFRP (0°, 45°, (0°/90°) and (45°/135°)). Test results showed that the capacity of ultimate load of strength of the slabs is increase (23%-65%) compared with slab unreinforced. The results illustrate that carbon-fiber-reinforced polymer (CFRP) reinforcement is perfect in reducing the deflection (3%-48%). The CFRP strengthening is perfect in reducing the strain.