The bonding performance of basalt fiber-reinforced polymer and concrete substrate has a significant effect on the reliability of externally strengthened existing concrete structure, due to being the most vulnerable element to failure in this fiber-reinforced polymer–concrete strengthening system. Its failure can result in the failure of the whole structure. Although many previous researchers have been interested in the tensile bonding strength of carbon fiber-reinforced polymer and glass fiber-reinforced polymer–concrete interface, that of basalt fiber-reinforced polymer–concrete interface has been very limited. Thus, the objective of this study is to experimentally assess the tensile bonding strength of the basalt fiber-reinforced polymer–concrete interface. The effects of high temperature, freezing–thawing cycles, type of resin, and concrete crack widths on the tensile bonding strength are also investigated. The pull-off experiment is conducted according to ASTM D7522/D7522M-15. A total of 205 core specimens of 50 mm diameter and 10 mm depth were taken from 41 concrete beams. The experimental results illustrate that both freezing–thawing and high-temperature condition have a substantial effect on the bonding strength of the basalt fiber-reinforced polymer–concrete interface. Bonding strength was decreased within the range of about 9%–30% when the number of freezing–thawing cycles increases from 100 to 300; likewise, it was decreased up to 30% when the exposure temperature rises to 200°C. Also, the specimens which were repaired to close their cracks by epoxy resin had no significant effect on the bonding strength of basalt fiber-reinforced polymer–concrete interface, when the specimens had crack width of less than 1.5 mm.

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玄武岩纤维增强聚合物-混凝土界面拉伸粘结强度的试验评价

玄武岩纤维增强聚合物与混凝土基材的粘结性能对外部加固现有混凝土结构的可靠性有显着影响，因为玄武岩纤维增强聚合物-混凝土加固体系中最易失效的因素。它的失效会导致整个结构的失效。尽管许多先前的研究人员对碳纤维增强聚合物和玻璃纤维增​​强聚合物-混凝土界面的拉伸粘合强度感兴趣，但玄武岩纤维增强聚合物-混凝土界面的拉伸粘合强度非常有限。因此，本研究的目的是通过实验评估玄武岩纤维增强聚合物-混凝土界面的拉伸粘合强度。高温、冻融循环、树脂类型、还研究了混凝土裂缝宽度对拉伸粘结强度的影响。拉拔实验根据 ASTM D7522/D7522M-15 进行。从 41 根混凝土梁上取下总共 205 个直径为 50 毫米、深度为 10 毫米的核心试样。实验结果表明，冻融和高温条件对玄武岩纤维增强聚合物-混凝土界面的结合强度有显着影响。当冻融循环次数从100次增加到300次时，粘结强度下降约9%～30%；同样，当暴露温度升高到 200°C 时，它下降了 30%。此外，用环氧树脂修复裂缝的试样对玄武岩纤维增强聚合物-混凝土界面的结合强度没有显着影响，