TY - JOUR
T1 - Characterisation of alkali-activated stainless steel slag and blast-furnace slag cements
AU - Ghorbani, Saeid
AU - Stefanini, Laura
AU - Sun, Yubo
AU - Walkley, Brant
AU - Provis, John L.
AU - Schutter, Geert De
AU - Matthys, Stijn
N1 - Funding Information:
This research study was carried out in the framework of the “By-products for sustainable concrete in the urban environment” (URBCON) project-NWE 725, funded by the Interreg North-West Europe Programme under the EU Cohesion Policy and financed by the European Regional Development Fund (ERDF) . Additionally, the authors wish to express their gratitude towards Ecocem, Aurubis and Orbix for providing the GGBS and CS and EAFS used within this study.
Funding Information:
This research study was carried out in the framework of the “By-products for sustainable concrete in the urban environment” (URBCON) project-NWE 725, funded by the Interreg North-West Europe Programme under the EU Cohesion Policy and financed by the European Regional Development Fund (ERDF). Additionally, the authors wish to express their gratitude towards Ecocem, Aurubis and Orbix for providing the GGBS and CS and EAFS used within this study.
Publisher Copyright:
© 2023 The Authors
PY - 2023/10
Y1 - 2023/10
N2 - Rapid global industrial growth is causing an increase in the generation of large-scale by-products and waste materials, which can be recycled in the construction industry to decrease both the environmental impact of the sector and the impact of these waste materials, to ultimately contribute to the circular economy. In the current study, electric arc furnace stainless steel slag (EAFSS) as a potential precursor in the production of alkali activated materials (AAMs) is investigated, along and alternatively to the use of ground granulated blast-furnace slag (GGBFS). Five blended mixtures with different levels (0, 25, 50, 75 and 100 wt %) of EAFSS to replace GGBFS are activated with an alkaline silicate solution. Partially replacing GGBFS with EAFSS prolongs the dormant period in reaction and reduces the overall heat release of the paste mixtures. This results in a positive effect on fresh-state properties, increasing and prolonging workability and mixture setting times. A general decrease in strength is seen with EAFSS inclusion, although satisfactory compressive and flexural strength values of more than 85 and 9 MPa, respectively, were obtained at 28 days with up to 50% replacement of GGBFS by EAFSS. Most of the crystalline phases present within EAFSS do not participate notably in alkali-activation, other than merwinite which slowly dissolves and reacts to form a weak binder phase. The chromium present in the EAFSS is contained in a stable spinel phase; this element does not appear to be mobile in leaching tests.
AB - Rapid global industrial growth is causing an increase in the generation of large-scale by-products and waste materials, which can be recycled in the construction industry to decrease both the environmental impact of the sector and the impact of these waste materials, to ultimately contribute to the circular economy. In the current study, electric arc furnace stainless steel slag (EAFSS) as a potential precursor in the production of alkali activated materials (AAMs) is investigated, along and alternatively to the use of ground granulated blast-furnace slag (GGBFS). Five blended mixtures with different levels (0, 25, 50, 75 and 100 wt %) of EAFSS to replace GGBFS are activated with an alkaline silicate solution. Partially replacing GGBFS with EAFSS prolongs the dormant period in reaction and reduces the overall heat release of the paste mixtures. This results in a positive effect on fresh-state properties, increasing and prolonging workability and mixture setting times. A general decrease in strength is seen with EAFSS inclusion, although satisfactory compressive and flexural strength values of more than 85 and 9 MPa, respectively, were obtained at 28 days with up to 50% replacement of GGBFS by EAFSS. Most of the crystalline phases present within EAFSS do not participate notably in alkali-activation, other than merwinite which slowly dissolves and reacts to form a weak binder phase. The chromium present in the EAFSS is contained in a stable spinel phase; this element does not appear to be mobile in leaching tests.
KW - Alkali activated materials
KW - Characterisation
KW - Ground granulated blast furnace slag
KW - Leaching
KW - Microstructural analysis
KW - Stainless steel slag
UR - http://www.scopus.com/inward/record.url?scp=85166928435&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2023.105230
DO - 10.1016/j.cemconcomp.2023.105230
M3 - Article
SN - 0958-9465
VL - 143
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 105230
ER -
