高温下地聚合物混凝土损伤演化及动态本构模型研究

采用高温SHPB试验系统对高温下地质聚合物混凝土(Geopolymeric Concrete, GC)损伤演化规律及本构模型进行试验研究。结果表明，高温下GC主要力学性能指标呈显著的应变率强化效应及温度弱化效应；利用波阻抗衡量GC的高温损伤可行、有效，所得损伤演化规律能较好表征GC损伤实际情况；以静力本构模型为基础，通过引入应变率强化因子及温度弱化因子构建GC动态损伤本构模型，通过试验结果标定参数，可获得较准确的地质聚合物混凝土动态损伤本构模型。

Research on the damage evolution and dynamic constitutive model of geopolymeric concreteat elevated temperatures

The damage evolution law and dynamic constitutive model of geopolymeric concrete at elevated temperatureswere investigated using a high temperature SHPB system. The results show that the major mechanical performance indexes reveal prominent temperature and strain rate effect.The wave impedance can be used to measure the thermal damage of geopolymericconcrete, and the damage evolution law has a good agreement with the actual situation. Based on the static constitutive model, the dynamicdamage constitutive model of geopolymeric concreteconsidering effects of temperature and strain ratewasestablished, and the indexes can be determined by experimental results. This model can accurately describe the dynamic characteristics of geopolymeric concreteat elevated temperatures.