Fibers made of basalt fiber reinforced polymer (BFRP) have been used to reinforce concrete material. BFRP fiber with double-helix geometry was recently proposed, with demonstrated superior bond-slip behavior between fiber and concrete matrix hence improved reinforcing effects on concrete materials. To further examine the contribution of double-helix BFRP fibers to the impact resistance of concrete material, this study carries out laboratory tests to investigate the static and dynamic properties of BFRP fiber reinforced concrete (BFRC) under compression and tension loadings. The investigation on the influence of volume fraction of double-helix BFRP fibers on the mechanical properties of concrete under quasi-static loads is firstly presented. It is found that increasing BFRP fiber volume fraction up to 1.5% leads to improved compressive strength, splitting tensile strength and flexural performance of BFRC. The toughness of BFRC with 1.5% fiber volume fraction is 3.8 times that of plain concrete at the deflection of 3 mm and the uniaxial compressive strength and splitting tensile strength are increased by 10.7% and 16.2%, respectively. Furthermore, the dynamic mechanical properties of BFRC with 1.5% fiber volume fraction were investigated by compressive, spitting tensile and spall tests using split Hopkinson pressure bar test systems. Test results reveal that the addition of double-helix BFRP fibers enhances the strain rate sensitivity of concrete in terms of strength, ductility and energy absorption capacities, and the rate sensitivity is more significant with the increase of strain rate. Based on the test results, empirical formulas of DIF-strain rate relations for compressive and tensile strengths of BFRC are proposed.

由玄武岩纤维增强聚合物 (BFRP) 制成的纤维已被用于增强混凝土材料。最近提出了具有双螺旋几何形状的 BFRP 纤维，其在纤维和混凝土基体之间表现出优异的粘结滑移行为，从而提高了对混凝土材料的增强效果。为了进一步检验双螺旋 BFRP 纤维对混凝土材料抗冲击性的贡献，本研究进行了实验室试验，以研究 BFRP 纤维增强混凝土 (BFRC) 在压缩和拉伸载荷下的静态和动态性能。双螺旋BFRP纤维体积分数对混凝土力学性能影响的研究首先介绍了准静态载荷下的情况。研究发现，将 BFRP 纤维体积分数提高到 1.5% 可以提高BFRC 的抗压强度、劈裂强度和弯曲性能。纤维体积分数为1.5%的BFRC在挠度3 mm时的韧性是普通混凝土的3.8倍，单轴抗压强度和劈裂抗拉强度分别提高了10.7%和16.2%。此外，使用分离式霍普金森压力棒测试系统，通过压缩、吐出拉伸和剥落测试研究了具有 1.5% 纤维体积分数的 BFRC 的动态力学性能。试验结果表明，双螺旋BFRP纤维的加入提高了应变率混凝土在强度、延性和能量吸收能力方面的敏感性，并且速率敏感性随着应变率的增加而更加显着。根据试验结果，提出了BFRC抗压强度和抗拉强度的DIF-应变率关系的经验公式。