试验研究了一种捻制超高分子量聚乙烯(UHMWPE)纤维增强的新型纤维混凝土动态压缩力学性能.研制了4种纤维体积掺量(0.3％、0.5％、0.7％、1.0％)的C70等级纤维混凝土,采用Φ100 mm分离式霍普金森压杆进行冲击压缩试验,研究了纤维混凝土在140～255 s-1应变率下的动态压缩力学性能.试验结果表明:UHMWPE纤维混凝土抗压强度、峰值应变和弹性模量具有明显的应变率敏感性;纤维混凝土抗压强度应变率敏感性弱于素混凝土,但其弹性模量应变率敏感性强于素混凝土;动态强度增长因子与应变率对数呈线性关系,具体关系与纤维掺量相关.%The dynamic compressive mechanical properties of a new type of fiber reinforced concrete with twisted UHMWPE fiber were experimentally studied.The C70 high strength concrete with four different fiber volume fractions (0.3％ 、0.5％ 、0.7％ 、1.0％)was developed,and the impact compression experiment was conducted to study the dynamic compressive mechanical behaviors of fiber concrete under 140 ～255 s-1 with Φ100 mm split Hopkinson pressure bar.The experiment result shows the compressive strength,peak strain,and elastic modulus of the UHMWPE fiber concrete have significant strain rate sensitivity.The strain rate sensitivity of compressive strength of the UHMWPE fiber reinforced concrete is lower than that of the plain concrete,while the strain rate sensitivity of the elastic modulus of UHMWPE fiber reinforced concrete is higher than that of the plain concrete.The dynamic increase factor has linear relationship with logarithmic strain rate,which is influenced by the fiber volume fraction.
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