混凝土高温动态压缩力学性能实验

摘要

利用一种新的快速加热混凝土的方法和SHPB实验系统对自制混凝土进行了不同温度下的动态压缩初步实验,发现了混凝土在高温下的动态压缩力学性能的规律性:在高温动态压缩条件下,温度变化是影响混凝土力学性能的主要因素,应变率的影响是次要因素.另外,该混凝土高温动态压缩破坏可以分为2种模式(裂纹模式和破碎模式).%An experimental setup was developed for rapid heating up concrete based on the principle of microwave heating and concrete specimens were manufactured. Dynamic compression experiments were conducted for the manufactured concrete specimens by using a split Hopkinson pressure bar system at different temperatures. The experimental results show that temperature is the primary factor for influencing the dynamic compression mechanical performance of concrete at high temperature and strain rate is the minor factor. Under dynamic compression, the concrete damage at high temperature can be divided into crack and fracture modes.