Abstract
Temperature plays an important role in many rock engineering practices. The increase or decrease of temperature induces the damage characterized by cracks/voids in the rock and thus reduces its strength. Therefore it is essential to quantify the damage induced by the heat-treatment and establish its correlation to the mechanical properties of rocks. In this study, X-ray Micro-computed tomography (CT), a non-destructive observation technique was utilized to quantify the damage induced by the heat-treatment. Using CT images, the damage variables were measured for Longyou sandstone (LS) at three heat-treatment temperatures, 250°C, 450°C, and 600°C, and room temperature of 25°C. The dynamic compressive strength of LS was then obtained by a modified split Hopkinson pressure bar system with the loading rate from 102 to 104GPa/s. An empirical equation to quantify the correlation between the damage variable and the dynamic compressive strength was established from the experimental data.
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