高温下玄武岩纤维增强地质聚合物混凝土的动态压缩力学行为

Dynamic Compressive Mechanical Behavior of Basalt Fiber Reinforced Geopolymer Concrete under High Temperature

为研究高温下玄武岩纤维增强地质聚合物混凝土(BFRGC)的动态压缩力学行为,本文制备了纤维体积掺量为0%、0.1%、0.2%、0.3%的BFRGC试件,并对其进行了不同温度(20、200、400、600、800℃)下的动态冲击试验。结果表明:BFRGC试件静态抗压强度、动态抗压强度和比能量吸收具有明显的温度强化效应和高温损伤效应,峰值应变表现出显著的温度塑化效应。BFRGC试件的静态抗压强度、动态抗压强度的温度阀值为400℃。随着温度的升高,BFRGC试件的静态抗压强度、动态抗压强度和比能量吸收均先增大后减小,峰值应变不断增大。掺加适量的玄武岩纤维可以提高常温及高温下地质聚合物混凝土的静态抗压强度和动态力学性能,且其最佳掺量为0.1%。

In order to study the dynamic compressive mechanical behavior of basalt fiber reinforced geopolymer concrete(BFRGC)after high temperature,BFRGC specimens with fiber volume content of 0%,0.1%,0.2%and 0.3%were prepared,and dynamic impact tests of BFRGC specimens at 20,200,400,600 and 800℃were carried out.The results show that the static compressive strength,dynamic compressive strength and specific energy absorption of BFRGC specimens have obvious temperature enhancement effect and high temperature damage effect,and the peak strain shows a significant temperature plasticization effect.The temperature threshold of static compressive strength and dynamic compressive strength of BFRGC specimens is 400℃.With the increase of temperature,the static compressive strength,dynamic compressive strength and specific energy absorption of BFRGC specimens increase first and then decrease,and the peak strain increases continuously.The static compressive strength and dynamic mechanical properties of geopolymer concrete at room temperature and high temperature can be improved by adding appropriate content of basalt fiber,and the optimal content of basalt fiber is 0.1%.