关键词: 混凝土, 力学性能, 玄武岩纤维, 聚丙烯纤维, 橡胶, 强度, SEM微观分析, 复合材料

Abstract: Orthogonal experiments were designed for hybrid fiber rubber concrete (HFRC), and its mechanical properties were tested and compared with ordinary concrete. The volume ratio of basalt fiber, polypropylene fiber and rubber volume ratio were analyzed for the impact of HFRC's compression and splitting strength. The results show that when the volume ratio of basalt fiber is 0.3%, the volume ratio of polypropylene fiber is 0.2%, and the volume ratio of rubber is 5%, the performance of HFRC is the best. Basalt fiber has an impact on the strength of HFRC and the strength of HFRC mixed with hybrid fiber has been greatly improved, which reflects a good fiber "positive hybrid effect". As the volume rate of rubber increases, the strength of HFRC gradually decreases. With the help of SEM microscopic analysis, the mechanism of fiber toughening and crack resistance of HFRC was discussed, and finally the strength of HFRC was modeled.

Key words: concrete, mechanical properties, basalt fiber, polypropylene fiber, rubber, strength, SEM microanalysis, composites