Abstract
Variations in wave velocity and porosity of sandstone after high-temperature treatment are investigated. The results for normalized wave velocity and porosity show that 400 °C is the critical threshold temperature of sandstone. Below 200 °C, porosity increases slowly as the treatment temperature increases, while wave velocity gradually decreases. When the temperature is higher than 400 °C, porosity quickly increases, and wave velocity sharply decreases. The “room temperature–200 °C” and “200–400 °C” temperature ranges correspond to the undamaged state and the microdamage state, respectively.
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