Abstract
The overall objective of this work was to determine whether steel slag might be processed into a sufficiently cementitious material to allow it to be recycled as an additive to ordinary Portland cement clinker. Steel slag has limited cementitious properties due to both a lack of tricalcium silicate and the presence of wustite solid solutions as a predominant mineral phase. This work explores the effects of Fe oxidation state, overall composition, and cooling rate on the mineral structure, crystalline formation, and glass forming ability of several synthetic slags and one commercial BOF slag. XRD, SEM, and EDX analyses were performed on both slow cooled and quenched slags which had been oxidized. The granulated slag product was blended with Portland cement in varying ratios and hydrated to form cylindrical compression specimens. By controlling certain slag processing conditions, specifically the oxidation of bivalent iron and the quenching rate of the molten slag, the cementitious nature of the material is enhanced. This allows the material to be blended with Portland cement (at additions of up to 20% by weight), without affecting the strength and performance of the material.
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