玄武岩纤维活性粉末混凝土力学性能试验研究

Experimental Study on Mechanical Properties of Basalt Fiber Reinforced Reactive Powder Concrete

玄武岩纤维活性粉末混凝土(RPC)具有强度高、耐久性好、耐高温良等优点,适用于复杂条件下建筑结构用材料。为研究玄武岩纤维RPC的静态力学性能,试验配制了5种纤维体积掺量分别为0.1%、0.15%、0.20%、0.25%、0.30%和两种不同纤维长度(6 mm、12 mm)的玄武岩纤维活性粉末混凝土(BFRPC),研究了玄武岩纤维对RPC抗压强度和抗折强度的影响,并与其它玄武岩纤维混凝土的试验结果进行了对比分析。试验结果表明,玄武岩纤维对提高混凝土的抗压强度作用不大,甚至出现负增长现象,但对抗折强度的影响较为明显,随着玄武岩纤维掺量增加,抗折强度先增加后减小,当体积含量为0.15%~0.20%时效果最佳;长度为6 mm的纤维比12 mm的纤维对抗压强度和抗折强度提高效果好;对比分析发现玄武岩纤维对抗压强度的影响不明显,但对抗折强度的提高效果较好。本文的研究成果可为玄武岩纤维RPC的推广应用提供一定理论依据。

Basalt fiber reinforced reactive powder concrete (RPC) has the advantages of high strength, good durability, and high temperature resistance, which is suitable for building structural materials under complex conditions. In order to study the static mechanical properties of basalt fiber reinforced RPC, 5 kinds of fiber volume content of 0.1%, 0.15%, 0.20%, 0.25%, 0.30% and two different fiber lengths of 6 mm and 12 mm of basalt fibers were considered. The influence of basalt fiber on the compressive strength and flexural strength of RPC was studied, and the test results of other basalt fiber reinforced concrete were compared and analyzed. The results show that basalt fiber has little effect on improving the compressive strength, and even shows a negative growth, but the effect on flexural strength is more obvious. As the content of basalt fiber increases, the flexural strength first increases and then decreases. The best volume content of basalt fiber is 0.15%~0.20%. The fiber with a length of 6 mm is better than the fiber with a length of 12 mm in improving the compressive strength and flexural strength. Through comparative analysis, it is found that the influence of basalt fiber on compressive strength is not obvious, but is better on improving the flexural strength. The research of this paper can provide a certain theoretical basis for the application of basalt fiber reinforced RPC.