Bond Property between Rebars and Basalt Fiber–Reinforced Concrete after Exposure to High Temperatures

Abstract

Pullout tests were performed on ordinary concrete (OC) specimens and basalt fiber–reinforced concrete (BFRC) specimens after exposure to high temperatures (20°C, 100°C, 300°C, 500°C, and 700°C). The effect of temperature on the bond property between rebars and concrete was studied. The measured data indicated that temperature below 300°C generates little damage to the bond performance for both OC and BFRC, while a temperature exceeding 500°C leads to sharp deterioration, which is similar to the changing pattern of concrete strength. The deterioration degree of bond strength and bond stiffness of BFRC specimens after exposure to high temperatures is lower than that of OC, while the deformation ability is better. In the end, a practical bond strength–slip constitutive model was established, taking account of the temperature in coefficients.