Abstract: In order to better study the reinforcement effect of hybrid steel fiber on cement-based materials, three kinds of steel fibers with lengths of 6 mm (S), 13 mm (M) and 35 mm (H) were used to prepare cylindrical specimens for drop weight impact test. The effects of steel fiber hybrid methods on the impact resistance and crack resistance of cement-based materials were explored from the aspects of impact times, energy consumption, failure pattern and crack width development. The test results show that the impact resistance of steel fiber increases gradually from single to triple mixing. The increasing effect of steel fiber on the strength and impact resistance of cement-based materials is M＞H＞S. The combination mode of steel fiber double mixing is M+H＞S+M＞S+H. When 1.5%M and 0.5%H were mixed, the strengthening and toughening effect of steel fiber was the best, and the bending strength of steel fiber was 22.6 MPa at 28 d, which was 3.2% and 31.4% higher than that of M and H alone. The compressive strength of 28 d was 154.8 MPa, which was 40.1% and 65.5% higher than that of M and H, respectively. The energy consumption of initial crack shock was 23.5% and 425% higher than that of two fibers, and the energy consumption of failure shock was 36.7% and 300% higher than that of two fibers, respectively. The optimal dosage of the three kinds of steel fibers was 0.5%S, 0.5%M and 1%H, respectively, and the energy consumption of initial cracking and failure shock was 33.3% and 1.9% higher than that of the optimal dual-mixing group (M1.5H0.5), respectively. The two parameter Weibull distribution can reasonably describe N1 and N2 of steel fiber hybrid reinforced cement-based materials. S inhibits the creation and expansion of microcracks, while M and H prevent the development of macroscopic cracks at different stages of loading. The various fibers act as progressive crack arrestors at different structural levels and in different loading stages.
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2024, Vol. 38 
