关键词: 玄武岩纤维, 低温, 抗压强度, 抗拉强度, DIF, 温度效应, 应变率效应, 复合材料

Abstract: The effects of temperature effect and strain rate effect on the mechanical properties of basalt fiber reinforced concrete were studied based on experiments. An electro-hydraulic servo press and a split Hopkinson pressure bar (SHPB) were used to carry out uniaxial compression tests of basalt fiber reinforced concrete under different impact pressures in low temperature environments (10 ℃、0 ℃、-10 ℃、-20 ℃、-30 ℃). The relationship between specimen stress-strain curve, compressive strength, tensile strength and growth factor with temperature and impact pressure was analyzed. The results show that the decrease of the temperature increases the peak stress of the specimen, while the peak strain decreases. Compared with 10 ℃ under the action of 0.55 MPa impact air pressure, the compressive strength of the specimens increased by 1.50%, 7.09%, 15.83% and 23.34% at the temperatures of 0 ℃, -10 ℃, -20 ℃ and -30 ℃. The strength increases 10.34%, 23.17%, 38.86% and 60.78%, respectively. Under the action of low temperature, the peak compressive strength and tensile strength of the specimen increase, the resistance to external load increases, and the ductility decreases. Under different impact pressures, the compressive and tensile strength DIF of the specimen increases with the decrease of temperature. The low temperature environment makes the specimen more sensitive to the strain rate effect, and the strain rate effect sensitivity of tensile strength is higher than that of compressive strength. In the low temperature environment, the influence of the peak tensile strength and compressive strength of the specimen should be given priority to the temperature effect, followed by the strain rate effect.

Key words: basalt fiber, low temperature, compressive strength, tensile strength, DIF, temperature effect, strain rate effect, composites