玄武岩纤维与碳纤维复合材料包裹混凝土中高应变率下系统性对比试验

Systematic comparative tests on concrete wrapped with basalt fiber and carbon fiber reinforced polymer at moderately high strain rates

  • 摘要: 为对比玄武岩纤维复合材料与碳纤维复合材料包裹高强混凝土的抗冲击性能,采用Φ100 mm分离式霍普金森压杆装置对C50混凝土短柱试件开展了中高应变率下的动态单轴压缩试验。通过试验现象和实测数据,分析了不同包裹层数下试件的动态应力-应变曲线、吸能情况及动态强度提升规律,并从作用机理层面解释了两种纤维复合材料约束作用的差异。结果表明,随着包裹层数的增加,两种纤维复合材料均可以有效提高混凝土的动态强度、韧性和延性,不同的是,玄武岩纤维复合材料包裹试件表现出更好的延性和抗冲击韧性,其峰值应变约为碳纤维复合材料包裹试件的1.8~3.6倍,而碳纤维复合材料包裹试件具有更高的强度。两种试件的动态强度比与约束比均呈现较为显著的线性关系,碳纤维复合材料的约束效率更高,约为玄武岩纤维复合材料的2.6倍,对动态强度提升更显著。

     

    Abstract: To compare the impact resistance of high-strength concrete wrapped with basalt fiber reinforced polymer and carbon fiber reinforced polymer, dynamic uniaxial compression tests were conducted on C50 concrete short column specimens at moderately high strain rates using a Φ100 mm split Hopkinson pressure bar apparatus. Based on the test phenomena and measured data, the dynamic stress-strain curves, energy absorption, and pattern of dynamic strength enhancement of the specimens with different wrapping layers were analyzed, and the differences in the confinement effects of the two fiber reinforced polymers were explained in terms of their action mechanisms. The results show that with the increase in the number of wrapping layers, both basalt fiber reinforced polymer and carbon fiber reinforced polymer can effectively enhance the dynamic strength, toughness and ductility of concrete. The difference is that the specimens wrapped with basalt fiber reinforced polymer exhibit superior ductility and impact toughness, with peak strains approximately 1.8 to 3.6 times those of the carbon fiber reinforced polymer wrapped specimens, whereas those wrapped with carbon fiber reinforced polymer achieve higher dynamic strength. A linear relationship is observed between the dynamic strength ratio and the confinement ratio for both types of specimens, and carbon fiber reinforced polymer has a higher confinement efficiency, approximately 2.6 times that of basalt fiber reinforced polymer, leading to a more significant enhancement in dynamic strength.

     

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