Study on Mechanical Behavior of Concrete by Temperature and Steel Fiber Content

Temperature and steel fiber content have a great influence on the mechanical behavior of concrete, so it is urgent to study the mechanical properties of concrete at different temperatures and steel fiber content. The effects of temperature and steel fiber content on the mechanical properties of concrete are studied in this paper. Based on the uniaxial compression testing machine, the uniaxial compression tests of concrete under different temperatures (150°C, 300°C, 450°C) and different steel fiber content (0%, 1%, 2%, 3%) are carried out. With the increase of temperature, the compressive strength of concrete first increases and then decreases, which indicates that there is a critical temperature for the influence of temperature on the compressive strength of concrete. In addition, the addition of steel fiber content significantly improves the compressive strength of concrete. In addition, temperature and steel fiber content significantly affect the peak strain of concrete. Based on the SEM test results, the temperature effect of concrete was investigated from the microscopic perspective.