INFLUENCE OF CFRP REINFORCEMENT ON CHLORIDE ION PENETRATION IN CONCRETE BEAMS
Cracked reinforced concrete(RC)beams can be repaired effectively by using externally bonded CFRP sheets.However,when the strengthened beams are subjected to marine environment,long-term performance will be affected by chlorine.This study investigated the penetration of chloride ion of RC beams strengthened with CFRP sheets exposed to marine environment.Accelerated ageing experiments were carried out by exposing specimens to cyclic wetting in sea water and drying in 40℃ air for 3 months and 6 months,respectively.After the environment exposure,the diffusion of chlorides in the strengthened beams was analysed.The result shows that CFRP bonding can reduce the chloride penetration into the concrete,especially in the bonding interface,while the cracks in the concrete accelerated the chloride penetration.Whats more,the residual deflections and cracks in the RC T-beams damaged by loading cannot be ignored especially under chloride environment,and repaired by CFRP can decrease the permeability of chloride.In addition,steel bonding can also reduce the chloride penetration into the concrete,but not as good as CFRP bonding,especially in the early time.The chloride ion content of the steel bonding beams immersed for 3 months was 165%higher than that of CFRP bonding beams,but the chloride ion content of the steel bonding beams immersed for 6 months just increased only 35%higher than the CFRP bonding beams,which showd that the influence of the permeation rate of the chloride ion by different reinforced forms is more obvious in the early immersion,gradually narrowing the gap later.
chloride CFRP bonding penetration wet-dry circle
Yan Xie Kunhua Guan Jun Deng Yi Wang
School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou,510006
国际会议
新加坡
英文
1-9
2017-07-19（万方平台首次上网日期，不代表论文的发表时间）