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Souayfan, F., Roziere, E., Paris, M., Deneele, D., Loukili, A. & Justino, C. (2022) Si-29 and Al-27 MAS NMR spectroscopic studies of activated metakaolin-slag mixtures. Construction and Building Materials, 322 126415.
Added by: Richard Baschera (2022-02-10 16:55:34) Last edited by: Richard Baschera (2022-02-10 16:58:16) |
| Type de référence: Article DOI: 10.1016/j.conbuildmat.2022.126415 Numéro d'identification (ISBN etc.): 0950-0618 Clé BibTeX: Souayfan2022 Voir tous les détails bibliographiques  |
Catégories: ID2M, IMN Mots-clés: Al MAS NMR, Alkali activated materials, geopolymer, metakaolin, Reaction degree, Si MAS NMR, Slag, strength Créateurs: Deneele, Justino, Loukili, Paris, Roziere, Souayfan Collection: Construction and Building Materials |
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| Liens URLs https://www.scienc ... /S0950061822001088 |
| Résumé |
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Blending metakaolin with slag in alkali-activated materials represents a promising way to achieve both acceptable engineering properties and durability. Nuclear Magnetic Resonance (NMR) spectroscopy has appeared as a key technique to investigate the structure of alkali-activation products. However, there is not a consensus on the analysis of NMR spectra to identify the phases formed in binary slag-metakaolin mixtures. This paper characterizes the phase composition and the reaction degree of alkali-activated metakaolin-slag blends, with special emphasis on the effect of H2O/Na2O ratio. Different approaches based on the literature are presented and implemented to analyze NMR data. The results suggest the formation of a heterogeneous phase involved in the transformation of 3D network to C-A-S-H. The evaluation of the reaction degree showed that the incorporation of slag in activated metakaolin mixtures resulted in higher reactivity of metakaolin and higher compressive strength.
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