In recent years, the application of repair and reinforcement method of existing structure is advanced with CFRP. In this method, on-site hand lay-up molding/bonding or CFRP plate bonding is often used. However, in the case of hand lay-up method, the construction time is increased with the number of layers. Also, the case of CFRP plates, it is difficult to apply without planar surface. Then, a method with more workability and high reinforcement effect should be developed to increase the structural performance. In this study, we propose a technique that can increase stiffness rapidly and efficiently by using pre-formable carbon fiber sheets that can solve these problems by vacuum assisted resin transfer molding and bonding method on the surface of existing structure and we demonstrate its bending strength by experiment.
