Strength and Elasticity of Steel Fiber Reinforced Concrete at High Temperatures

Abstract

Compressive strength and modulus of elasticity of plain and steel fiber reinforced concrete, both before and after exposure to high temperatures were investigated in this study. Two fiber volume fractions of 0.5% and 1.0% were used. Three temperature levels of 150 oC, 350 oC and 500 oC were adopted in addition to room temperature.The test results showed that compressive strength and modulus of elasticity decreased after high temperatures exposure. At 350 oC, the plain concrete recovered some of the lost strength at 150 oC, while fiber reinforced concrete showed a slight additional decrease in strength at 350 oC as compared to 150 oC. Only minor loss in modulus of elasticity occurred at 150 oC for both plain and fiber reinforced concrete, which was limited to about 11%. While at 500 oC, significant deterioration occurred. The residual modulus of elasticity at 500 oC was in the range of 31% to 42%.

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