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Transformation of stainless steel slag toward a reactive cementitious binder
Author(s) -
Kriskova Lubica,
Eroli Massimiliano,
Iacobescu Remus I.,
Onisei Silviana,
Vecchiocattivi Franco,
Pontikes Yiannis
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15306
Subject(s) - slag (welding) , decarburization , cementitious , materials science , metallurgy , portland cement , basic oxygen steelmaking , isothermal process , microstructure , cement , scanning electron microscope , composite material , steelmaking , physics , thermodynamics
Abstract Argon oxygen decarburization ( AOD ) slag represents more than 50 wt% of the slag from stainless steel production. Although some applications are available, e.g., as aggregates for road constructions or fertilizers, they are characterized by low economic value and limited applicability. In order to increase the economic value of AOD slag, alternative applications have been proposed, e.g., as partial or full replacement for Ordinary Portland Cement ( OPC ). The work presented here investigates whether the adaptation of the AOD slag chemistry within a high temperature process leads to an improvement of its hydraulic properties and thereby can demonstrate its potential to be converted into a hydraulic binder suitable for OPC replacement. For this purpose, three synthetic AOD slags with basicities (CaO/SiO 2 ) of 2.0, 2.2, and 2.4 were synthesized, and the effect of the CaO/SiO 2 ratio on the material stability, the amount of tricalcium silicate formed, and their hydraulic properties investigated. X‐ray diffraction, scanning electron microscope ( SEM ), and isothermal calorimetry analysis were used to characterize the microstructure and the hydraulic activity. The results show that the proposed method is indeed a promising way to stabilize a stainless steel AOD slag and convert it into a hydraulic binder.