Mechanical properties of high ductile concrete under different temperatures

This study aimed to determine the uniaxial compression and splitting tensile properties of high ductile concrete under environments of different temperatures. Uniaxial compression strength and splitting tensile strength of high ductile concrete under standard curing (temperature 20±2 °C, humidity ≥95%), water curing (temperature 15±2 °C, 100% humidity), and −20 °C curing (-20±2 °C, 75%–85% humidity) were investigated. The variation laws of stress–strain response, elastic modulus and peak stress, etc. of high ductile concrete under uniaxial compression at different temperatures and the evolution laws of splitting tensile strength and energy were analyzed. Results revealed the strength variation mechanism of high ductile concrete under different curing conditions. According to the test data, the relationship between the uniaxial compressive strength and splitting tensile strength of high ductile concrete and the curing temperature and the relationship between the splitting tensile energy and the curing temperature were fitted. A constitutive model of the uniaxial compression of high ductile concrete under environments of different temperatures was established. With increasing curing temperature, the compressive strength, splitting tensile strength, elastic modulus, and energy of high ductile concrete specimens increased gradually, while the peak strain decreased gradually. The effect of curing temperature on compressive strength was significantly higher than that on splitting tensile strength.