摘   要：研究了玄武岩纤维的长径比和掺量对新拌混凝土的工作性能以及硬化体力学性能的影响，通过扫描电镜（SEM）观察了纤维在混凝土中的分散情况。结果表明，纤维的加入会降低新拌混凝土的工作性能；玄武岩纤维可以显著提高混凝土的抗折、劈裂抗拉强度，但对抗压强度的影响较小，并且纤维的长径比和掺量的变化将改变混凝土的力学性能。12mm纤维对混凝土的抗压和劈裂抗拉强度增长最显著，分别为-12.2%~8.4%和5.4%~11.5%。18mm纤维对混凝土的抗折强度增长最佳，相比于基准混凝土增长14.3%~17.1%。此外，纤维在混凝土中的分散性随着长径比和掺量的增长而下降。

Abstract: The effect of length-diameter and mixing amount of basalt fibers on the workability of fresh concrete and mechanical property of hardened concrete was studied, and the dispersion of basalt fibers in concrete was observed by using scanning electron microscope(SEM). The results show that the addition of basalt fibers in concrete will reduce the workability, and obviously improve the flexural and splitting strength of fiber reinforced concrete, but has little influence on the compressive strength. Meanwhile, the mechanical property of fibers reinforced concrete will change with the length-diameter and mixing amount of basalt fibers. The fiber has the best reinforcement for the compressive and splitting strength of concrete at the 12mm length, up to -12.2% to 8.4% and 5.4% to 11.5%, respectively. At the 18mm length, the fiber can greatly improve the flexural strength of concrete, up to 14.3% to 17.1%. Moreover, the dispersibility of basalt fibers, in concrete, drops with the increase of the length-diameter and mixing amount.