ABSTRACT
Thermal properties of rock, more specifically thermal conductivity is a critical property and is useful in different engineering and scientific applications. In the present study, an attempt has been made to analyze the effect of high temperature on thermal conductivity and induced damage of Jhiri shale rock. Shale samples have been kept at a designated temperature from room temperature to 900°C at an interval of 100°C. Thermal conductivity and P-wave velocity have been measured at room temperature after thermal treatment. Steady state method has been used for the measurement of thermal conductivity of Jhiri Shale.
Assessment of induced damage at different temperatures has been done and correlated with the thermal conductivity of shale rock. It has been observed that thermal conductivity decreases from 4.36 to 1.77 W/m.K as temperature changes from 25°C to 900°C. P-wave velocity also decreases from 4.33 to 1.52 Km/s with the increase in temperature up to 900°C. SEM analysis has also been carried out to visualize the change in microstructure caused by thermal treatment. It has been observed that up to the temperature of 300°C, there is a very small change in measured properties.
