This paper aims at understanding the effects of temperature on consolidation and volume change behavior of the Bangkok clay due to elevated temperature. A conventional oedometer was modified and fitted with a heater and thermostat and consolidation tests were performed under controlled environment. Consolidation tests on normally consolidated specimens revealed that volume contracts upon heating. Samples during thermal unloading swelled in contrast. The effect of an elevated temperature is similar to that of primary consolidation process. However, if prolonged heat is applied (reloaded) with higher temperature, the effect of temperature increase becomes similar to that of secondary consolidation. The deformation induced during thermal loading is not fully recoverable mainly because once the soil is heated clay structures deteriorate.