Abstract
The aim of this work was to investigate the binding potential of non-hydraulic, crystalline continuous casting stainless steel slag, which is a by-product from stainless steel production, by alkali activation with sodium hydroxide and potassium hydroxide. Calorimetric analysis of the activated slag showed low cumulative heat evolution at 20°C. Slag mortars did not harden at this temperature. Considerable enhancements in heat evolution and hardening were observed at 80°C. The resulting hydrated slag showed the formation of calcium silicate hydrate type reaction products and brucite in thermogravimetric analysis. X-ray diffraction analysis showed a reduction in the amount of γ-dicalcium silicate and periclase. Elemental mapping showed the presence of calcium, silicon and minor amounts of magnesium in the hydrated phase. An optimum activator dosage of 7·5M of sodium hydroxide or potassium hydroxide was found to generate the highest amount of reaction products and compressive strength.
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