Abstract: Abstract: In order to study the mechanical properties of molybdenum tailing concrete under uniaxial compression at high temperature, the axial compressive strength, peak strain, elastic modulus, Poisson's ratio, failure mode and mass changes of molybdenum tailing concrete specimens at different target temperatures (20, 200, 300, 400, 600, 800 ℃) were tested. The results showed that the mass loss rate of molybdenum tailing concrete specimens increased with the increase of temperature, and the average mass loss rate was 6.52% at 800 ℃. The axial compressive strength gradually decreases with the increase of temperature, with an average decrease of 70.04% at 800 ℃ compared with room temperature, and decreases with the increase of molybdenum tailings admixture. While the peak strain decreases first and then increases with the increase of temperature. Both the modulus of elasticity and Poisson's ratio decreased with the increase of temperature, and the modulus of elasticity and Poisson's ratio decreased by 88.22% and 35.66% on average at 800 ℃ compared with room temperature. For the modulus of elasticity, it generally decreased with the increase of molybdenum tailing admixture, while for Poisson's ratio, the concrete with 100% molybdenum tailing admixture was slightly larger than the concrete with 50% admixture. According to the test results, the uniaxial compression stress-strain constitutive equation of molybdenum tailing concrete after high temperature is established.

Key words: Key words: Molybdenum tailings concrete, high temperature, uniaxial compressive, residual mechanical properties, constitutive relation, mass loss rate