TEMPERATURE DEPENDENCE OF YOUNG'S MODULUS OF RED SANDSTONE

Abstract

In the underground rock diagenetic process, or artificial excavation in rock engineering, it is possible to make experience in the high temperature. The temperature dependence of Young's modulus of red sandstone was characterized by impulse excitation technology. It is shown that after heating-cooling cycle the Young's modulus of red sandstone decreases down to about 90% from the room temperature up to 800°C of its initial value. The significant change of Young's modulus with temperature is attributed to thermal-induced damages in red sandstone, including the rock composition variation, mass loss, mineral phase composition change, porosity increasing, grain trans-granular, micro-cracks penetrated and disruption.