Residual fracture properties of normal- and high-strength concrete subject to elevated temperatures

摘要

The effects of elevated temperatures (T_m), related to the exposure period (t_h) and the curing age (t_a), on the residual fracture properties of normal-strength concrete (NSC) and high-strength concrete (HSC) were investigated by conducting three-point bending tests on 87 notched preheated beams. Most beams were exposed to temperatures between 100 deg.C and 600 deg.C for 12 h at 14 days, while some NSC beams were heated either for various exposure periods up to 168 h at 14 days or for 12 h at 7, 28 and 90 days. The weight loss (w) was also monitored.