College of Construction Engineering, Jilin University, Changchun 130026, China

Static uniaxial compression tests were conducted on 16 granite specimens after thermal treatment using a heating device and an electro-hydraulic servo pressure-testing machine.The effects of air cooling and water cooling on the physical and mechanical properties of the high-temperature granite specimens were studied.Test results showed that the longitudinal wave velocities of the high-temperature specimens gradually decreased after they were cooled by water and air.The peak stress and elastic modulus of the samples decreased gradually with an increase in temperature,whereas their peak strain increased gradually.The effects of peak stress and peak strain were considerably more evident when cooling by water than by air.This result demonstrated that the thermal cracking of the granite specimens,and consequently,their internal micro-fractures,further developed when the specimens were cooled by water.