Experimental Study on Tensile Strength of Steel Fiber-Reinforced Concrete Subjected to High Temperature

Tensile strength of steel fiber-reinforced concrete was investigated with experimental program. For the investigation, Double Punch Test, which is known as a test method with low validity, was used. Fiber type(hooked and twisted fiber), mix ratios by vol-ume ranged from 0.25 % to 1.0%, aspect ratio were used as variables for the tests. The specimens were exposed to the elevated temperatures(300oC, 500oC and 700oC) for 2 hours and placed at ambient temperatures for 12 hours before testing. Results dem-onstrated that residual tensile strength increases as mix ratio and aspect ratio increase. The effect of fiber type was insignificant. Based on the test results, the linear equation for prediction of DPT residual tensile strength was proposed in terms of mix ratio an