Engineering properties of four different rocks after heat treatment

The effect of high temperature on engineering properties rocks has recently become an important topic for geotechnical applications due to the development in geothermal energy extraction, underground coal gasification, disposal nuclear waste and deep mining applications. This study aims investigate four heated at temperatures identify corresponding mineralogical changes. Two types sandstone (Beaudesert Jimboomba sandstone), basalt argillite were subjected a range from 25 800 °C their such as porosity point load index studied through series laboratory experiments. physical alteration rock specimens also investigated better understand thermally induced processes that occurred each type using X-Ray Diffraction, Thermogravimetry (TG), Differential Scanning Calorimetry (DSC) Derivative (DTG) techniques. obtained data indicated role mineral composition thermal behaviour rocks. Noticeable changes compositions threshold observed type. was confirmed with TG/DSC/DTG analysis. temperature-related process resulted formation cracks, increase decrease strength. However, effects found be different two types. While Beaudesert underwent significant weakening temperatures, only slight change strength recorded. identified 400 °C, 500 300 tested sandstone, samples, respectively. critical (obtained damage coefficient) 570 both basalt, 440 argillite. Analysis revealed difference between temperatures. It is recommended use parameters provide more accurate estimations which undergoes