玄武岩纤维地聚物混凝土的高温动态力学特性

采用自主研制的高温100 mm SHPB试验装置,研究了玄武岩纤维增强地聚物混凝土(BFRGC)的瞬时高温动态力学特性.采用厚度为1.0 mm,直径为30,35,40,45,50 mm的铝片作为整形器对入射波进行整形,保证了试验过程的有效性.结果表明:不同温度下,玄武岩纤维地聚物混凝土(BFRGC)的动态抗压强度、峰值应变和能量吸收特性随应变率的提高近似线性增长;200℃时BFRGC的动态抗压强度相对于常温时大幅度提高;随着温度的升高,BFRGC的峰值应变显著提高,且均大幅度高于常温时的峰值应变值;200～600℃时BFRGC的吸能特性明显优于常温状态,而800℃时能量吸收特性明显降低.

High-temperature Dynamic Mechanical Property of Basalt Fiber Reinforced Geopolymeric Concrete

Self-designed high-temperature Φ100 mm SHPB apparatus was used to study the instant high-temperature dynamic mechanical property of basalt fiber reinforced geopolymeric concrete.Aluminium pulse shapers with 1 mm thick and 30 mm,35 mm,40 mm,45 mm,50 mm in diameter were adopted to reform the incident wave,which satisfied the validity of SHPB tests.The results showed that the dynamic compressive strength,critical strain and energy absorption property were strain rate dependent,and the strain rate effect could be expressed by linear approximations.The dynamic compressive strength at 200 ℃ increased a lot compared to that at room temperature.The critical strain increased with the temperature,all of which were higher than room temperature status.The energy absorption property increased significantly at 200 ℃-600 ℃,while it decreased dramatically at 800 ℃.