超高性能注浆纤维水泥基材料力学性能研究

Research of mechanical properties of ultra high performance slurry infiltrated fiber cementitious composites

进行不同纤维率、不同纤维类型和不同纤维长度下注浆纤维水泥基材料(Slurry Infiltrated Fiber Cementitious Composites,SIFCC)的抗弯、抗压强度变化规律以及SIFCC的弯曲韧性研究。研究结果表明:在本文试验范围内,无论是废旧轮胎回收纤维还是端勾纤维,随着纤维率的增加,其对应SIFCC试件的抗压、抗弯强度均逐渐增加;同一纤维率下,掺端钩型纤维的试件的抗压、抗弯强度普遍高于掺回收纤维的试件的抗压、抗弯强度;且该条件下25 mm钢纤维相比13 mm钢纤维无论是在抗弯还是抗压方面的性能都有提高,因此在后续的SIFCC研究当中应尽量采用长纤维;弯曲韧性指数随着纤维率的提高而增大;针对弯曲韧性而言,在6%,8%和10%纤维率的范围内,8%纤维掺量的纤维利用效率最高。

The article mainly studied the change law of the flexural and compressive strength of slurry infiltrated fiber concrete （Slurry Infiltrated Fiber Cementitious Composites, SIFCC） under different fiber, different fiber types and different fiber length, and the bending toughness of SIFCC. The results show that： in this paper, whether it is waste tire recycling fibers or hooked-fibers, with the increase of fiber content the compressive strength and flexural strength of SIFCC were increased; Under the same fiber ratio, the compressive strength and flexural strength of the specimens with the hooked-fiber are generally higher than the recycled fibers; And under this condition, compared with 13 mm steel fiber, the performance of 25 mm steel fiber is improved in the aspect of bending and compression, so it is necessary to use long fiber in SIFCC research; The flexural toughness index increases with the increase of fiber ratio; For the flexural toughness, the fiber utilization efficiency of the 8% fiber content is the highest in the range of the fiber rate of 6%, 8% and 10%.