Abstract The bond between epoxy-coated reinforcement (ECR) and seawater coral aggregate concrete (SCAC) were studied by using a series of pull-out tests. Five different parameters were considered in this test: types of concrete (SCAC and ordinary concrete (OC)) and reinforcement (ECR and ordinary reinforcement), the ratio of bond length to reinforcement diameter (3, 5 and 8), and concrete strength (C25 and C35) and thickness of concrete cover. The failure mode, bond-slip curve and strength of specimens were analyzed. Typical failure mode of pull-out specimen was splitting failure, while the failure surface of SCAC specimen was different from that of OC specimen. Test results indicated that the bond strength of specimen with SCAC was high compared to specimen using OC even under the similar concrete strength. Seawater coral aggregate concrete-ECR (SCAC-ECR) bond strength decreased with increasing bond length and decreasing concrete strength and thickness of concrete cover. The bond-slip curve of SCAC-ECR was similar to that of ordinary concrete (OC)-ordinary reinforcement (OR). However, SCAC and ECR reduced the bond-slip curve curvature. The decline of curve was improved by using ECR. Finally, an analytical expression for bond stress-slip curves was proposed. The obtained results provide a basis for the application of reinforced SCAC.

中文翻译：

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环氧涂层钢筋与海水珊瑚骨料混凝土的粘结

摘要 通过一系列拉拔试验研究了环氧涂层钢筋（ECR）与海水珊瑚骨料混凝土（SCAC）之间的粘结。在该测试中考虑了五个不同的参数：混凝土类型（SCAC 和普通混凝土 (OC)）和钢筋（ECR 和普通钢筋）、粘结长度与钢筋直径的比率（3、5 和 8）以及混凝土强度（ C25 和 C35）和混凝土保护层的厚度。分析了试件的破坏模式、粘结滑移曲线和强度。拉拔试件的典型破坏模式为劈裂破坏，而SCAC试件的破坏面与OC试件不同。试验结果表明，即使在混凝土强度相似的情况下，与使用 OC 的试件相比，使用 SCAC 的试件的粘结强度更高。海水珊瑚骨料混凝土-ECR (SCAC-ECR) 粘结强度随着粘结长度的增加和混凝土强度和混凝土保护层厚度的降低而降低。SCAC-ECR 的粘结滑移曲线与普通混凝土 (OC)-普通钢筋 (OR) 的粘结滑移曲线相似。然而，SCAC 和 ECR 降低了粘结滑移曲线曲率。使用ECR改善了曲线的下降。最后，提出了粘结应力-滑移曲线的解析表达式。所得结果为增强型SCAC的应用提供了依据。使用ECR改善了曲线的下降。最后，提出了粘结应力-滑移曲线的解析表达式。所得结果为增强型SCAC的应用提供了依据。使用ECR改善了曲线的下降。最后，提出了粘结应力-滑移曲线的解析表达式。所得结果为增强型SCAC的应用提供了依据。