Fiber Reinforced High Strength Concrete: Residual Strength and Pore Structure Subjected to High Temperatures

Abstract

Investigations were conducted on the mechanical properties and pore structure of fiber reinforced high strength concrete subjected to different high temperatures and cooling regimes. The significant drop in the compressive and splitting tensile strength took place between 400 deg C and 600 deg C; and the decline in the flexural strength happened mainly before 400 deg C. Steel fibers played a significant role in preventing the worsening of the mechanical properties, particularly at the temperature range of 400 to 600 deg C.