Experimental Study of Post-Fire Behavior of Steel Fiber Reinforced Ceramsite Concrete Filled Steel Tubes

Abstract

The axial compressive mechanical behavior of steel fiber reinforced ceramsite concrete filled steel tubes (noted as SFR-CCST) after exposure to fire are experimentally studied. Effect of furnace temperature, dosage of steel fiber in specimens on the post-fire mechanical performance of the specimens after exposure to fire was especially discussed. The results show that all the specimens of SFR-CCST have higher post-fire bearing capacity and better plastic deformation, and there was no obvious descending segment in the load-strain curves of the most specimens after exposure to fire. It was concluded that the furnace temperature applied to the specimens and dosage of steel fiber in the specimens of SFR-CCST has some effect on the post-fire mechanical performance of the ceramsite concrete-filled steel tubes after exposure to fire, and the dosage of steel fiber of 0.5% has the most effect on the post-fire performance of lightweight aggregate concrete filled steel tubes after exposure to fire.

Study on the Compressive Stress–Strain Curve and Performance of Low-Slump Polypropylene Fiber Concrete after High Temperature

“…Zheng [29] pointed out that when the addition of polypropylene fiber was 0.25% volume fraction, the impact strength of foamed concrete increased by 300% compared to a blank control group. To reduce the bursting and peeling of concrete shield tunnel segments under fire and to improve durability, Zhang et al [30][31][32][33][34][35] investigated the fire performance of concrete shield tunnel segments with polypropylene fibers and their mixtures. Krishna et al [36] observed that the hybrid mixture of polypropylene and micro-steel fibers exhibited good impact resistance at high temperatures.…”