Abstract
The bond between carbon fiber reinforced polymer (CFRP) and concrete is significantly and adversely affected by thermal cycles in air and water. In the present study, the effects of thermal cycles in air or water on the bond performance between CFRP and concrete were examined. A single-lap shear test was adopted to evaluate the performance of the CFRP–concrete bond. A number of 270 thermal cycles in air increased the interfacial fracture energy of the CFRP plate– and CFRP sheet–concrete by 35% and 20%, respectively while 270 thermal cycles in water reduced the interfacial fracture energy of the CFRP plate– and CFRP sheet–concrete by 9% and 46%, respectively. Thermal cycles in water caused the failure mode to change from concrete cohesive failure to primer–concrete interfacial debonding. The failure modes of CFRP–concrete exposed to thermal cycles in air still occurred in concrete. A reduction factor for the CFRP–concrete structure for thermal cycles in water was proposed.
Highlights
Bonded carbon fiber reinforced polymer (CFRP) has become a popular technology for the rehabilitation of concrete structures
The failure modes of CFRP–concrete exposed to thermal cycles in air still occurred in concrete
The present study investigates the effects of thermal cycles in air or water on the bond behavior of a CFRP–adhesive–concrete system
Summary
Bonded carbon fiber reinforced polymer (CFRP) has become a popular technology for the rehabilitation of concrete structures. It has been reported that the interfacial bond between CFRP and concrete is susceptible to low temperature, high temperature, thermal cycles, relative humidity, and freeze–thaw cycles [5,6]. The high and low temperatures induced by thermal cycles affect the interfacial failure of CFRP–concrete bonds [7]. With a further increase to 365 thermal cycles, the interfacial fracture energy decreased by. Thermal cycles in air or water may cause variation in the CFRP–concrete failure modes under shear. The failure modes of CFRP–concrete under thermal cycles in water still occur in concrete owing to severe degradation of the concrete compressive strength [12]. The evolution of the constituent materials and the interfacial bond between CFRP and concrete was studied under the conditions of thermal cycles in air and water. This paper sheds light on the effect of water moisture on the bond failure mechanism at the interface region by degradation at the interface
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