钢纤维混凝土力学性能试验研究

Experimental research on the mechanical properties of SFRC

对钢纤维体积率(Vf)为O～3%、基体强度为C50的钢纤维混凝土(SFRC)进行立方抗压强度、轴心抗压强度、劈裂抗拉强度、弯曲强度、弹性模量和泊松比的测试,试验结果表明:SFRC抗压强度随Vf的增加仅仅有着小幅度的增长,正向立方抗压强度略大于侧向立方抗压强度;轴心抗压强度与立方抗压强度之比值在0.75～0.77之间;钢纤维对SFRC的抗拉、抗弯性能起着明显的增强作用,正向、侧向劈裂抗拉强度比值随Vf的增加而增大;SFRC的弹性模量和泊松比均是不敏感的材料参数,前者随材料抗压强度的提高而缓慢增加,后者随Vf的加大而略有减小.

The experimental research on the mechanical properties of steel fiber reinforced concrete （SFRC） was conducted. The volume fraction （Vf） of SFRC ranged from 0 to 3%, and the matrix was C50 concrete. The mechanical properties included cubic compressive strength, axial compressive strength, split-tensile strength, flexural strength,elastic module and Poisson＇ s ratio. The results showed that the compressive strength increased slowly with the increase of Vf, and the forward-direction cubic compressive strength of SFRC was a little larger than the lateral-direction one, and the ratio of axial compressive strength to cubic compressive strength ranged between O. 75 and O. 77.The results also showed that the adding of steel fiber into the matrix leaded to remarkably enhancement on tensile and flexural behaviour, and the ratio of forward-direction cubic tensile strength of SFRC to the lateral-direction one increased with the increase of Vf. In addition, the elastic modulus and Poisson＇ s ratio of SFRC were not sensitive material parameters, and the former raised slightly with the increase of compressive strengths of SFRC, and the latter decreased a little with the increase of Vf.