An experimental study to evaluate the postfire mechanical properties of concrete specimens

Abstract

In this research, the mechanical behavior of structural concrete made with materials in Iran has been experimentally investigated after experiencing high temperatures. For this purpose, six different mix designs were selected in accordance with Iranian Concrete Standard (ABA). Six different target temperatures (25, 100, 250, 500, 700, and 900°C) were also selected for the purpose of fire experience. Compressive and tensile strength tests were carried out on all of the samples and their behavior was evaluated after experiencing different target temperatures. The results show a strong drop in compressive and tensile strength at temperatures above 700°C. It can be noted that at 900°C all specimens lost their strength. Finally, thanks to the large number of experiments, different relationships are presented based on the results to determine the mechanical properties of different mix designs at different temperature levels.

Structural performance of ambient‐cured reinforced geopolymer concrete beams with steel fibres

“…Yu et al 42 investigated the effect of single‐sized and hybrid steel fibers in the ultra‐high performance conventional concrete and reported that the hybrid steel fibers are more efficient for improving the energy dissipation capacity of concrete under impact load. Saedi et al 43 reported that the mixture containing steel fiber had a better performance in all temperatures; its reduction pace was slower compared to other mix design until 700°C and showed more strength. Sayyad and Patankar 44 investigated the effect of steel fibers on the mechanical properties of GPC.…”