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Reactivity of MSWI-fly ash in Mg-K-phosphate cement
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SYSNO ASEP 0577640 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Reactivity of MSWI-fly ash in Mg-K-phosphate cement Author(s) Bernasconi, D. (IT)
Viani, A. (CZ)
Zárybnická, Lucie (UTAM-F) RID, SAI, ORCID
Mácová, Petra (UTAM-F) RID, SAI, ORCID
Bordignon, S. (IT)
Das, G. (IT)
Borfecchia, E. (IT)
Štefančič, M. (IT)
Caviglia, C. (IT)
Destefanis, E. (IT)
Bernasconi, A. (IT)
Gobetto, R. (IT)
Pavese, A. (IT)Number of authors 13 Article number 134082 Source Title Construction and Building Materials. - : Elsevier - ISSN 0950-0618
Roč. 409, December (2023)Number of pages 14 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords municipal solid waste fly ash ; magnesium phosphate cement ; waste reactivity ; stabilization/solidification OECD category Materials engineering Method of publishing Limited access Institutional support UTAM-F - RVO:68378297 UT WOS 001148178900001 EID SCOPUS 85177988303 DOI 10.1016/j.conbuildmat.2023.134082 Annotation In this study, the behaviour and reactivity of Municipal Solid Waste Incineration Fly Ash (MSWI-FA), introduced in the formulation of magnesium potassium phosphate cement (MKPC), was investigated by considering the waste either as fully inert or reactive. MSWI-FA induced structural and compositional modifications in MKPC as a consequence of dissolution/precipitation processes which involved many MSWI-FA elements (e.g., Ca, Mg, Al, Si, Zn) and led to the formation of mostly amorphous phosphate secondary products. The reaction path has been described in terms of the early fast dissolution of MSWI-FA, with precipitation of very low solubility phases, and subsequent late precipitation due to pH changes and water subtraction during MKPC gelification. The increase in amorphous content peaked to 50 wt.% and it has been related to the improved behaviour with respect to the leaching of heavy metals (reduced by 70-99%), pointing to this cement as an excellent matrix for their chemical stabilization. The obtained MKPC microstructure exhibited better mechanical performance, with an improvement of up to 60% in compressive strength. All in all, the results indicated that the incorporation in MKPC is a viable recycling opportunity for MSWI-FA, although, for an effective cement formulation, its reactivity must be taken into account. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2024 Electronic address https://doi.org/10.1016/j.conbuildmat.2023.134082
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