Advances in Cement Research vol:26 issue:5 pages:256-270
This paper aims at investigating the binding potential of non-hydraulic, crystalline continuous casting (CtCs) stainless steel slag, which is a by-product from stainless steel production process, by alkali activation with NaOH and KOH. Calorimetric analysis of the activated slag showed low cumulative heat evolution at 20 Â°C. Slag mortars did not harden at this temperature. Considerable enhancements in heat evolution and hardening were observed at 80 Â°C. The resulting hydrated slag showed formation of C-S-H type reaction products and brucite in thermogravimetric analysis. XRD analysis showed reduction in the amount of Î³-C2S and periclase. Elemental mapping showed the presence of Ca, Si and minor amount of Mg in the hydrated phase. An optimum activator dosage of 7.5 M of NaOH or KOH was found to generate the highest amount of reaction products and compressive strength.