玄武岩纤维增强轻骨料混凝土力学性能试验

Mechanical Properties Test of Basalt Fiber Reinforced Light Aggregate Concrete

为探究玄武岩纤维在增强轻骨料混凝土力学性能方面的影响,以不同玄武岩纤维体积率、陶砂代砂子率和陶粒代石子率为影响因素,应用正交试验法设计9组玄武岩纤维轻骨料混凝土(basalt fiber lightweight aggregate concrete,BF-LAC),进行抗压、劈裂抗拉及抗折强度试验。结果表明:当玄武岩体积率为0.3%、陶砂代砂子率为7%、陶粒代石子率为8%时,BF-LAC的力学性能表现最佳。玄武岩纤维掺入轻骨料混凝土中能显著提升其强度,抗压强度、劈裂抗拉强度和抗折强度的最大增幅分别为23.11%、20.64%和24.17%;玄武岩纤维是影响BF-LAC强度的显著性因素且对抗压强度的影响表现为特别显著;最后对纤维增强轻骨料混凝土的机理进行了分析并建立了BF-LAC强度与三因素之间的预测模型。

In order to explore the influence of basalt fiber on the mechanical properties of reinforced lightweight aggregate concrete,nine groups of basalt fibers were designed with different basalt fiber volume ratios,ceramsite replacement sand ratio and ceramsite replacement gravel ratio.All the compressive strength,splitting tensile strength and flexural strength of light aggregate concrete(BF-LAC)were tested.The results show that when the volume rate of basalt is 0.3%,the rate of ceramsite replacement of sand is 7%,and the rate of ceramsite replacement of gravel is 8%with the mechanical properties of BF-LAC perform best.Basalt fiber mixed into lightweight aggregate concrete can significantly increase its strength.The maximal increase in compressive strength,split tensile strength and flexural strength are 23.11%,20.64%and 24.17%respectively.Basalt fiber is a significant factor affecting the strength of BF-LAC,and the impact on compressive strength is particularly significant.Finally,the mechanism of fiber-reinforced lightweight aggregate concrete is analyzed and a prediction model between BF-LAC strength and the three factors is established.