中文摘要：

纤维以其塑性变形小、强度高、韧性大等优点在混凝土中得到越来越广泛的应用，但由于不同纤维的尺度与性能不同，导致其对混凝土的力学性能影响结果不同，因此本文分别对单掺、双掺仿钢纤维和聚丙烯纤维混凝土、钢纤维混凝土的抗压强度、劈裂抗拉强度和抗折强度进行了试验研究，并将其与普通混凝土的力学性能进行比较。结果表明，纤维混凝土较普通混凝土的抗压强度、劈裂抗拉强度、抗折强度都有明显提高，且混杂纤维较单一纤维混凝土的强度提高更为明显，混杂纤维混凝土的强度与钢纤维混凝土强度相差不大，并以成本低、分散性好、不易锈蚀等优点可以取代钢纤维在某些工程中的应用。

英文摘要：

Fiber concrete is widely used in the engineering with its small plastic deformation, high strength and larger toughness. But as a result of the different scale and performance of different fibers, the influence of mechanical properties on concrete is different. So the experiments of macro-synthetic fiber, polypropylene hybrid fiber, hybrid fiber on the compressive strength, splitting strength and flexural strength are researched in this paper, which are compared with the mechanical properties of common concrete. Results show that the compressive strength, splitting strength and flexural strength of fiber reinforced concrete has been greatly improved than ordinary concrete, and the strength of hybrid fibers has been increased more significantly than single fiber reinforced concrete. The strength of hybrid fibers and steel fiber are not significant, so steel fiber can be completely replaced by the hybrid fibers in the project application with its low cost, good dispersion and weak corrosion.