高温下碳-玄武岩混杂纤维混凝土力学性能研究OA

To investigate the mechanical properties and damage evolution of carbon-basalt hybrid fiber concrete after exposure to high temperatures,an orthogonal test was conducted to determine the optimal dosage of carbon fiber and basalt fiber.Concrete specimens with the optimal mix ratio were then subjected to high-temperature treatment,followed by monitoring of their damage during uniaxial compression tests using acoustic emission technology.The results show that the compressive strength of the concrete reaches its peak at 200 ℃.Under all temperature conditions,the stress values of hybrid fiber concrete are significantly higher than those of ordinary concrete.The damage evolution of the concrete is closely related to temperature,and oxidation of the fibers as well as weakening of interface bonding at high temperatures accelerate damage.The optimal mix ratio is 0.3％carbon fiber,0.4％basalt fiber,and 10.0％fly ash,which markedly enhances the high-temperature mechani-cal properties and damage resistance of the concrete.Compared with ordinary concrete,its compressive strength increases by 7.61％,flexural strength by 58.86％,and splitting tensile strength by 77.56％.Acoustic emission characteristics effectively reflects the damage evolution process,providing a basis for safety monitoring and ma-terial design of concrete structures in high-temperature environments.