Mechanical properties of geopolymer concrete exposed to dynamic compression under elevated temperatures

Abstract

Through adoption of a self-designed high temperature SHPB apparatus herein, an experimental study is made on the mechanical properties of geopolymer concrete (GC) exposed to dynamic compression under elevated temperatures. As the results have turned out, the weight loss is remarkable within temperature ranges from room temperature to 200°C as well as from 600°C to 800°C. The dynamic compressive strength of GC grows higher at 200°C than at room temperature, but suffers a dramatic drop at 800°C. The critical strain is higher at elevated temperature than that at room temperature. At 200°C and 600°C, respectively, its energy absorption property is superior to that at room temperature. However, at 400°C and 800°C, respectively, it is inferior to that at room temperature. The strain rate effect of the dynamic increase factor (DIF) obtained from test data can reflect the inherent nature of GC. The DIF assumes a linear relationship with the logarithm of strain rate.