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为了研究钢-聚丙烯混杂纤维混凝土的抗压、抗拉性能和增强机理,制备和易性良好、可以泵送施工的素混凝土(PC)、聚丙烯纤维混凝土(PFRC)、钢纤维混凝土(SFRC)和混杂纤维混凝土(HFRC),对设计强度为C50的4种材料进行立方体抗压和劈裂抗拉试验。结果表明:HFRC的立方体抗压强度分别比PC、PFRC和SFRC的增加6.5%、10.9%和1.8%。HFRC的劈裂抗拉强度分别比PC、PFRC和SFRC的增加12.59%、7.04%和1.56%。可见,混杂纤维对立方体抗压强度和劈裂抗拉强度增长效果显著。PC和PFRC在试验中均发生脆性破坏,而SFRC和HFRC均发生延性破坏。通过对比4种材料的抗压和抗拉性能,可为混杂纤维的增强机理研究提供基础。
In order to study the compressive, tensile properties and strengthening mechanism of steel-polypropylene hybrid fiber reinforced concrete, it is easy to prepare and workable and can be used to pump concrete (PC), polypropylene fiber concrete (PFRC), steel fiber reinforced concrete (SFRC ) And hybrid fiber reinforced concrete (HFRC) were tested. Cube compression and splitting tensile tests were performed on the four materials with C50 design strength. The results show that the cubic compressive strength of HFRC increases by 6.5%, 10.9% and 1.8% respectively than PC, PFRC and SFRC. The splitting tensile strength of HFRC increased by 12.59%, 7.04% and 1.56% respectively than PC, PFRC and SFRC. Can be seen that hybrid fibers on the cube compressive strength and splitting tensile strength growth effect is significant. Both PC and PFRC experienced brittle failure in the test, while ductile failure occurred in both SFRC and HFRC. Comparing the compressive and tensile properties of four kinds of materials, it can provide the foundation for the study of the reinforcement mechanism of hybrid fibers.