Experimental Study on Mechanical Properties of Heated Granite under Different Cooling Ways

The mechanical properties of heated granite subjected to two different cooling ways, namely cooled in the water (fast-cooling) and cooled in the air (slow-cooling) at room temperature, were studied respectively. The effects of the heating temperatures and cooling ways on the failure mode and failure mechanism of heated granite were analyzed. The tested results indicated that the longitudinal wave velocity, uni-axial compressive strength, and initial elastic modulus of heated granite decreased with the increasing heating temperature, especially for those subjected to the fast-cooling way compared to those subjected to slow-cooling way. To the contrary, the peak strain increased as the heating temperature increases, and the peak strain was bigger for the slow-cooling way than for the fast-cooling way. The analysis of the experimental results indicated that the water cooling accelerated the deterioration of the internal structure of heated granite and resulted in undesired mechanical properties.