Bond Behavior of Epoxy-Coated Reinforcing Bars with Seawater Sea-Sand Concrete

摘要

This paper investigates the bond behavior between epoxy-coated reinforcing bars (ECR) and seawater sea-sand concrete (SSC) to study the detrimental effect of coating on bonding performance. A total of 80 pullout specimens were fabricated and tested under uniaxial tensile load. The main test parameters include the reinforcing bar diameter, concrete cover, bond length, concrete strength, and stirrup ratio. Test results show that the ratio of bond strength of epoxy-coated reinforcing bars to similar specimens with uncoated bars embedded in SSC ranges from 0.85 to 0.95. Moreover, it can be speculated that the bond strength is increased with the concrete strength, concrete cover, and stirrup ratio and decreased with an increase of the reinforcing bar diameter and bond length. Finally, a new bond-slip model was proposed both for coated and uncoated reinforcing bars embedded in SSC and good agreement can be achieved between the test observations in this study and theoretical predictions based on the proposed model.