The hydration of ordinary Portland cement in the presence of 2% licosuperplast superplasticizer was studied at 25, 50 and 75-degrees-C by determining the setting time, and the free lime and non-evaporable water contents. X-ray diffraction and DTG studies of the hydrated samples were also made. Results indicated that setting times are decreased with temperature. In addition, it was observed that up to three days, the extent of hydration increased with temperature, whereas after this time the values were lowest at 75-degrees-C and highest at 50-degrees-C. The mechanism of hydration is discussed.