早强地质聚合物混凝土3h动力学性能

3 Hour Dynamic Performance of Early Strength Geopolymer Concrete

利用直径100mm的分离式霍普金森压杆试验系统,研究了养护龄期3h时地质聚合物混凝土(GC)的动态力学性能。结果表明:地聚物混凝土(GC)的动压强度、均值应变随应变率增大而增大,表现出明显的应变率效应;同时,试件峰值应变随应变率增大并无显著变化。由于养护龄期3h时GC试件内部水化反应不完全,薄弱环节较多,在承受较大冲击荷载时,导致GC试件应力应变曲线在峰值应力处出现一个持续的平台区域。

The aim of this paper is to investigate the dynamic mechanical properties of geopotymer concrete （GC） at 3 h curing period. Dynamic compressive tests on GC specimens were conducted by a split Hopkinson pressure bar system. The results indicate that the dynamic strength and average strain of GC display an increasing trend as strain rate increases but strain rate has a minor influence on the peak strain of GC. Under impact loading, however, incomplete hydration reaction exhibits a softening effect on GC as confirmed by the yielding region of stress-strain curve.