VALORISATION OF STAINLESS STEEL SLAGS AS A HYDRAULIC BINDER

Lubica Kriskova, Yiannis Pontikes, Fei Zhang, Özlem Cizer, Peter Tom Jones, Koen van Balen, Bart Blanpain

Abstract


This work is focused on exploring various cold and hot stage treatment paths of stainless steel slag as a tool to improve its hydraulic properties. At a cold stage, mechanical and chemical activation was applied on industrial stainless steel slag; and it was found that both activation methods effectively improve the reactivity of the studied slag. In addition, the detailed investigation of hydration on two major phases, γ – C2S and merwinite, revealed that their hydration resulted in the formation of C – S – H gel, typically formed during the hydration of OPC. Regarding the hot stage treatment, the combination of the chemistry modification with the addition of fly ash at 30 wt. % and fast cooling by means of water quenching resulted in a complete amorphisation of the material. Ultimately, the produced material possessing similar properties to granulated blast furnace slag could be used as a latent hydraulic material in blended cements.


Keywords


stainless steel slag; γ – dicalcium silicate; merwinite; hydration; SEM

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DOI: http://dx.doi.org/10.12776/ams.v19i3.159

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SJR 2014: 0.502 - Q2 Metals and Alloys, 39./125.

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