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

摘要

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 degrees C as well as from 600 degrees C to 800 degrees C. The dynamic compressive strength of GC grows higher at 200 degrees C than at room temperature, but suffers a dramatic drop at 800 degrees C. The critical strain is higher at elevated temperature than that at room temperature. At 200 degrees C and 600 degrees C, respectively, its energy absorption property is superior to that at room temperature. However, at 400 degrees C and 800 degrees C, respectively, it is inferior to that at room temperature. The strain rate effect of the dynamic increase factor (DM) obtained from test data can reflect the inherent nature of GC. The DIF assumes a linear relationship with the logarithm of strain rate. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.