This paper presents an experimental study on the bond characteristics of both sand-coated and ribbed-surface glass fiber reinforced polymer (GFRP) bars embedded in high-performance concrete (HPC). A total of 145 pullout tests were conducted in order to examine the effect of varying parameters on the bond characteristics, namely: embedment length, bar diameter, surface treatment, concrete cover and bond stress-slip relationships. The experimental results showed that the sand-coated bars exhibited better bond strength than that developed by the ribbed-surface GFRP bars, which entails lower development lengths. Besides, it was found that the increase in bar diameter was accompanied by a decrease in the bond strength. Furthermore, experimental results displayed a slight increase in the bond strength as the concrete cover increased from 40 to 60 mm. Finally, based on the material properties of the used GFRP bars and concrete patch, using HPC surrounding both sand-coated and ribbed surface GFRP bars resulted in unfavorable modes of failure. That is because in most cases GFRP bars failed by either shearing of the ribs of the ribbed-surface bars or peeling of the sand-coating layer out of the core diameter for the sand-coated bars.

本文对嵌入高性能混凝土 (HPC) 的砂涂层和带肋表面玻璃纤维增​​强聚合物 (GFRP) 钢筋的粘结特性进行了实验研究。总共进行了 145 次拉拔试验，以检查不同参数对粘结特性的影响，即：嵌入长度、钢筋直径、表面处理、混凝土覆盖层和粘结应力-滑移关系。实验结果表明，砂涂层钢筋表现出比肋面 GFRP 钢筋更好的粘结强度，这需要更短的发展长度。此外，发现棒材直径的增加伴随着结合强度的降低。此外，实验结果表明，当混凝土保护层从 40 毫米增加到 60 毫米时，粘结强度略有增加。最后，根据所使用的 GFRP 钢筋和混凝土补片的材料特性，在砂涂层和带肋表面 GFRP 钢筋周围使用 HPC 会导致不利的失效模式。这是因为在大多数情况下，GFRP 钢筋的失效是由于带肋表面钢筋的肋条被剪切或砂涂层从砂涂层钢筋的芯径剥落。