Effect of Elevated Temperature on RC Pre-Cracked Beams Repaired and Strengthened Using Jackets of Glass Fiber Reinforced Cementitious Materials

Abstract

Due to various causes of deterioration during the service life of concrete structures, retrofitting is a major need aimed to improve their future performance. Jacketing has been considered as one of the most widely used methods of rehabilitation of deteriorated beams. Fire attack is one of the important causes which may lead to serious symptoms of distress and in many cases to total collapse of the structure. Selecting cementitious materials of lower thermal conductivity for repair and strengthening of RC structural members will increase the thermal isolation of the reinforcement and thus improves the fire resistance of structures. Besides, using environmentally friendly cementitious materials as partial replacement of cement in concrete jackets will reduce concrete