Title: Effect of high cooling rates on the mineralogy and hydraulic properties of stainless steel slags
Authors: Kriskova, Lubica
Pontikes, Yiannis ×
Pandelaers, Lieven
Cizer, Özlem
Jones, Peter Tom
Van Balen, Koen
Blanpain, Bart #
Issue Date: 26-Jun-2013
Publisher: Minerals, Metals & Materials Society
Series Title: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science vol:44 issue:5 pages:1173-1184
Abstract: This article investigates the effect of chemical composition and cooling rate during solidification
on the mineralogy and hydraulic properties of synthetic stainless steel slags. Three synthetic
slags, covering the range of typical chemical composition in industrial practice, were subjected
to high cooling rates, by melt spinning granulation or quenching in water, and to low cooling
rates, by cooling inside the furnace. Both methods of rapid cooling led to volumetrically stable
slags unlike the slow cooling which resulted in a powder-like material. Stabilized slags consisted
predominantly of lamellar beta-dicalcium silicate (beta-C2S) and Mg, Ca-silicates (merwinite and
bredigite); the latter form the matrix at low basicity and are segregated along the C2S grain
boundaries at high basicities. Slowly cooled slags consist of the gamma-C2S polymorph instead of the
beta-C2S and of less Mg, Ca-silicates. Isothermal conduction calorimetry and thermogravimetric
analysis indicate the occurrence of hydration reactions in the stabilized slags after mixing with
water, while calcium silicate hydrates (C-S-H) of typical acicular morphology are identified by
SEM. The present results demonstrate that the application of high cooling rates can result in a
stable, environmental-friendly, hydraulic binder from stainless steel slags, rich in beta-C2S, without
the necessity of introducing any additions to arrest the beta polymorph.
ISSN: 1073-5615
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
Structural Composites and Alloys, Integrity and Nondestructive Testing
Sustainable Metals Processing and Recycling
Building Materials and Building Technology Section
× corresponding author
# (joint) last author

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