Mineralogical composition of EAF slag and stabilised AOD slag aggregates and dimensional stability of slag aggregate concretes

•UV fluorescence of EAF and AOD slag can help their mineralogical characterisation.•Cuspidine is present in EAF aggregates which fluoresce orange under short wave UV.•Beta-dicalcium silicate is the main mineral phase of stabilised AOD aggregates.•AOD slag aggregates contain mineral phases which can...

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Veröffentlicht in:Construction & building materials 2016-07, Vol.115, p.171-178
Hauptverfasser: Adegoloye, G., Beaucour, A.-L., Ortola, S., Noumowe, A.
Format: Artikel
Sprache:eng
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Zusammenfassung:•UV fluorescence of EAF and AOD slag can help their mineralogical characterisation.•Cuspidine is present in EAF aggregates which fluoresce orange under short wave UV.•Beta-dicalcium silicate is the main mineral phase of stabilised AOD aggregates.•AOD slag aggregates contain mineral phases which can show expansive reactions.•The use of EAF and AOD aggregates can slightly increase the concrete linear expansion. An interesting valorisation way of EAF slag and stabilised AOD slag is their use as aggregates in concrete. Mineralogical studies of these steel slags are therefore necessary. In this study, observations of slag aggregates under UV light are associated with usual mineralogical analyses (XRD, SEM and EDS) to ensure more representative results of the mineralogical variability within slag aggregates. Relationships between aggregate mineral composition and UV fluorescence colours are proposed. Mineralogical studies also show that the stainless steel slag contains low amounts of expansive mineral phases (free CaO, free MgO) that could affect concrete volume stability. To verify this finding, swelling measurements of high strength concretes made of EAF slag and stabilised AOD slag aggregates are carried out. The linear expansion of stainless steel slag concretes is slightly higher than that measured for concretes with silico-calcareous aggregates.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2016.04.036