Title: Valorisation of electric arc furnace steel slag as raw material for low energy belite cements
Authors: Iacobescu, Remus Ion ×
Koumpouri, Dimitra
Pontikes, Yiannis
Saban, Rami
Angelopoulos, G.N. # ×
Issue Date: Nov-2011
Publisher: Elsevier Scientific Pub. Co.
Series Title: Journal of Hazardous Materials vol:196 pages:287-294
Abstract: In this paper, the valorisation of electric arc furnace steel slag (EAFS) in the production of low energy belite cements is studied. Three types of clinkers were prepared with 0wt.% (BC), 5wt.% (BC5) and 10wt.% (BC10) EAFS, respectively. The design of the raw mixes was based on the compositional indices lime saturation factor (LSF), alumina ratio (AR) and silica ratio (SR). The clinkering temperature was studied for the range 1280-1400°C; firing was performed at 1380°C based on the results regarding free lime and the evolution of microstructure. In order to activate the belite, clinkers were cooled fast by blown air and concurrent crushing. The results demonstrate that the microstructure of the produced clinkers is dominated by belite and alite crystals, with tricalcium aluminate and tetracalcium-alumino-ferrite present as micro-crystalline interstitial phases. The prepared cements presented low early strength development as expected for belite-rich compositions; however the 28-day results were 47.5MPa, 46.6MPa and 42.8MPa for BC, BC5 and BC10, respectively. These values are comparable with OPC CEMI 32.5N (32.5-52.5MPa) according to EN 197-1. A fast setting behaviour was also observed, particularly in the case of BC10, whereas soundness did not exceed 1mm.
ISSN: 0304-3894
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Sustainable Metals Processing and Recycling
× corresponding author
# (joint) last author

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