Abstract
In order to study the constitutive relationship between the seawater sea sand recycled concrete (SSRC) and the epoxy-coated reinforcement (ECR), the pull-out tests were performed. There were totally 24 specimens with different types of concrete (natural aggregate concrete, recycled aggregate concrete and SSRC), strength grades (C20 and C25), bond lengths (3d, 5d and 8d), reinforcement types (ordinary steel bars and ECR) and cover thicknesses (67mm and 42mm). Test results indicated that the bond-slip curve of SSRC to ECR was similar to that of RC and OC, which can be divided into three stages: the micro-slipping, the slipping, and the declining. In the case of SSRC specimen and ECR specimen whose protective layer has a thinner thickness, the curvature of the ascending section of the curve decreased significantly. As to SSRC specimen with a higher strength and ECR with a shorter bonding length, the descending section of the curve tends to be flat. Finally, the expression of the bond-slip constitutive relationship between SSRC and ECR was proposed, which can shed light on theoretical analysis and practical engineering.
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