The recycling effect of BOF slag in the portland cement properties

Abstract The basic oxygen furnace (BOF) slag use as raw material for cement production carries economic, environmental and technical benefits to the cement industry, reducing energy costs, material consumption and waste storage areas. This study evaluates the partial replacement of blast furnace slag by BOF slag in the production of slag portland cement. Specimens were shaped with addition equivalent to 0; 1.8; 3.6 and 5.4%, in basic oxygen furnace slag weight, to the slag portland cement. The specimens were characterized by the setting time, axial compressive strength at ages 3, 7, 28 and 91 days, hot and cold expansibility. The cement with added basic oxygen furnace slag obtained gain in the initial and final strengths for all replacement levels. For the most replacement content (5.4%), the gain in compressive strength obtained amounts to 35% after 3 days and 29% after 28 days of hydration. The addition of basic oxygen furnace slag in slag portland cement composition had little influence on setting time.