Rehabilitation of structural concrete with fibre reinforced polymers

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Steel reinforcement corrosion is the number one deterioration problem for structural (reinforced or pre-stressed) concrete structures. The proposed research will investigate the use of fibre reinforced polymer (FRP) reinforcement to rehabilitate structural concrete. Two major projects will be pursued:     (1) Rehabilitation using FRP laminates: Research by the applicant has demonstrated that rehabilitation with FRP systems can mitigate corrosion by providing confinement to the expansive forces caused by reinforcing bar corrosion.  However, the work done to-date was focused on members repaired with FRP while in an unloaded state and tested after corrosion exposure. The proposed research will investigate the post-repair structural performance and bond performance of FRP repaired members under service loads in a corrosive environment. Analytical and service life prediction models will be developed for the FRP repair of corroded structural members.  This research will result in an effective rehabilitation of structures that have suffered steel reinforcement corrosion.     (2) Prestressing with FRP reinforcement: A novel anchor system for a carbon fibre reinforced polymer (CFRP) tendon has been recently developed by the applicant. CFRP reinforcement is an alternative material in prestressed concrete but has had very limited use mainly due to the lack of a suitable anchor. The proposed research will employ the UW developed anchor to grip CFRP tendons or strips as a strengthening measure for concrete members.  Reinforced concrete beams or slabs will be constructed, externally prestressed with CFRP tendons, and will be tested under static and cyclic loading conditions. Strengthening using near surface mounted (NSM) prestressed CFRP tendons will be investigated. The development of prestressed systems utilizing CFRP tendons will facilitate the use of these materials in rehabilitation and new construction of durable structures.