钢-聚丙烯混杂纤维混凝土的力学性能

Mechanical properties of steel-polypropylene hybrid fiber reinforced concrete

通过不同配比的纤维增强混凝土试验,分析了粉煤灰掺量、钢纤维掺量和聚丙烯纤维掺量对钢-聚丙烯混杂纤维混凝土立方体抗压强度、劈裂抗拉强度和抗折强度的影响。研究表明:在试验粉煤灰掺量范围内,粉煤灰掺量对抗压强度和抗折强度的影响一致,均随粉煤灰掺量增加先增大后减小,而劈裂抗拉强度随粉煤灰掺量增加不断增大;在试验钢纤维掺量范围内,钢纤维掺量对抗压强度、劈裂抗拉强度及抗折强度的影响一致,均随钢纤维掺量增加不断增大;在试验聚丙烯纤维掺量范围内,聚丙烯纤维掺量对抗压强度和抗折强度的影响一致,均随聚丙烯纤维掺量增加先增大后减小,而劈裂抗拉强度随聚丙烯纤维掺量增加先减小后增大。基于各试验变量的方差分析数据,可得最优配合比为:粉煤灰质量掺量为30%,钢纤维体积掺量为1.5%,聚丙烯纤维体积掺量为0.1%。

The effects of fly ash content, steel fiber content and polypropylene fiber content on the cube compressive strength, splitting tensile strength and flexural strength of steel-polypropylene hybrid fiber reinforced concrete were analyzed by different fiber reinforced concrete tests. The results show that within the range of fly ash content, the influence of fly ash content on compressive strength and flexural strength is consistent, which increases first and then decreases with the increase of fly ash content, while the splitting tensile strength increases with the increase of fly ash content. In the range of steel fiber content in the test, the influence of steel fiber content on compressive strength, splitting tensile strength and flexural strength is consistent, which increases with the increase of steel fiber content. In the range of polypropylene fiber content in the test, the effect of polypropylene fiber content on compressive strength and flexural strength is consistent. Both increase first and then decrease with the increase of polypropylene fiber content, while the splitting tensile strength decreases first and then increases with the increase of polypropylene fiber content. Based on the variance analysis data of each test variable, the optimal mix proportion is: fly ash content is 30%, steel fiber content is 1.5%, polypropylene fiber content is 0.1%.