Slag is a by-product of different metal extraction and refining processes. This paper reports the results of an experimental study on replacing part of ordinary Portland cement (OPC) with iron and steel slags. In Iranian iron and steel plants, slags are generated at three different stages of processing; Basic Oxygen Furnace (BOF), Electrical Arc Furnace (EAF) and Granulated Blast Furnace (GBF) are the slags used in this study. In this respect, some mixtures were made with 10%, 20% and 30 wt% of each slag replaced in ordinary Portland cement. For this study, the effects of slag additions in cement was determined by measuring of electrical conductivity and pH of slurry, setting time of paste and mechanical strength of mortar at various ages. According to the results, 10% EAF or BOF slag can safely replace part of OPC in mortars.
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