The effect of preparing of reinforced concrete beams with CFRP on their flexural strength

Many concrete structures have been damaged due to natural disasters such as earthquake, wind, or corrosive fatigue. Therefore, the use of new technologies to modernize and improve these structures is important. Fiber reinforced polymer (CFRP) composites are widely used in retrofit and strengthening of reinforced concrete (RC) structures. FRP composites are applicable for strengthening various structural elements including beams, columns and plane elements such as floor slabs and shear walls. In this paper, the effect of surface preparation on concrete beams with carbon fabrics has been investigated. 8 Reinforced concrete beams were made by composite fibers and a concrete sample beam in the laboratory and tested for four-point bending loading Took. The experimental and Theoretical results of the proposed method have been presented in which the preparation in sandblasting, in addition to increasing the flexural strength, delayed the early detachment in the beams tested. It was also observed that the bending capacity in the beam increased with a 45.9% CFRP reinforcement layer and CFRP reinforcement layer 64.8% higher than that of the sample beam