The results showed lower heat of hydration with the incorporation of BOF slag. The incorporation of 20% and 45% BOF slag in the pastes decreased the 3 days heat of hydration by 20.25% and 42.52%, respectively. Wang et al. [19] found lower heat of hydration of cement pastes with the incorporation of 22.5% and 45% BOF slag (fineness 458m2/kg) as a cement replacement. This reduction increased with increasing BOF slag content.