Rehabilitation of heated and damaged medium strength self compacting steel fiber reinforced concrete corbels

This thesis presents an experimental study that investigates the mechanical performance of heated and damaged self-compacting steel fiber reinforced concrete corbels, after rehabilitation of them by epoxy injection and Basalt Fiber Reinforced Polymer (BFRP) fabric. This study is the first experimental investigation that describes the rehabilitation and strengthening of heated and damaged concrete corbels. In this study, a total of 18 normal strength double sided corbels which had been failed and damaged due to high temperature and overloading were repaired. Nine of the damaged corbels were repaired with crack repairing epoxy injection only and the remained corbels beside injection were strengthened with BFRP externally. All the corbels have had same size and reinforced with the same main reinforcement. The experimental results show that proposed techniques can be preferred in order to restore and improve the ultimate load carrying capacity of the damaged corbels. Moreover, strengthening with BFRP fabric increased ductility of the corbels besides enhancement in load capacity. In addition, the results indicate that the failure modes for some of corbels which were repaired with only repairing epoxy have been changed as compared to the first failure while all of the BFRP strengthened corbels have failed because of de- bonding of the fabric from the corbel surface.