Bond Behavior of Corroded Reinforcement in Concrete Wrapped with Carbon Fiber Reinforced Polymer Under Cyclic Loading

doi:10.1007/s12204-013-1393-2

Abstract

Abstract: Abstract: Bond behavior of corroded reinforcement in concrete wrapped with carbon fiber reinforced polymer (CFRP) under cyclic loading is experimentally investigated. An electrolyte corrosion technique is used to accelerate the corrosion of the steel bar in cylindrical concrete specimens. Wrapped specimens are strengthened with one layer of CFRP after the reinforcements are corroded. The experimental parameters investigated include: corrosion level, CFRP wrapped and number of loading cycles. Test results indicate that bond strength and area of hysteretic curve of CFRP wrapped specimens are larger than those of the unwrapped specimens. With increasing the number of loading cycles, the bond strength and area of hysteretic curve decrease gradually, especially at the 1st cyclic loading. The CFRP wrapping reduces the bond degradation rate effectively and prevents the bond-splitting failure of the corroded concrete specimens.

Key words: carbon fiber reinforced polymer (CFRP)| bond| corrosion| cyclic loading| hysteresis curve

摘要： Abstract: Bond behavior of corroded reinforcement in concrete wrapped with carbon fiber reinforced polymer (CFRP) under cyclic loading is experimentally investigated. An electrolyte corrosion technique is used to accelerate the corrosion of the steel bar in cylindrical concrete specimens. Wrapped specimens are strengthened with one layer of CFRP after the reinforcements are corroded. The experimental parameters investigated include: corrosion level, CFRP wrapped and number of loading cycles. Test results indicate that bond strength and area of hysteretic curve of CFRP wrapped specimens are larger than those of the unwrapped specimens. With increasing the number of loading cycles, the bond strength and area of hysteretic curve decrease gradually, especially at the 1st cyclic loading. The CFRP wrapping reduces the bond degradation rate effectively and prevents the bond-splitting failure of the corroded concrete specimens.

关键词: carbon fiber reinforced polymer (CFRP)| bond| corrosion| cyclic loading| hysteresis curve

CLC Number:

TU 5

DAI Xiao-dong* (代晓东), WANG Xiao-hui (王小惠), KOU Xin-jian (寇新建). Bond Behavior of Corroded Reinforcement in Concrete Wrapped with Carbon Fiber Reinforced Polymer Under Cyclic Loading[J]. Journal of shanghai Jiaotong University (Science), 2013, 18(3): 271-277.

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