Strength and deformability of heated confined fibrous concrete Available to Purchase

The objective of this study is to gain knowledge of the strength and deformability of confined fibre reinforced high-strength concrete (HSC) after exposure to a thermal cycle at high temperature. A total of 126 confined cylindrical specimens (150 mm diameter, 450 mm height) were cast and tested. The confined concrete specimens were reinforced with six 8 mm diameter bars as longitudinal reinforcement and 6 mm diameter hoops equally distributed along the height. After exposing the specimens to the desired elevated temperature ranging from room temperature to 800°C, they were allowed to cool naturally in the furnace before testing them under axial compression the next day. The variables considered in this experimental study included maximum exposure temperature, volume fractions of steel and polypropylene fibres and the use of hybrid fibres. The effects of temperature on confined fibre reinforced HSC were studied and quantified with respect to strength and ductility. Important observations have been made about the residual thermal and mechanical behaviour of confined fibre reinforced HSC. The results show that the residual post-fire strength and strain capacities of confined fibre reinforced concrete were better than those of comparable confined non-fibre concrete.