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29Si and 27Al MAS NMR spectroscopic studies of activated metakaolin-slag mixtures

Abstract : 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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https://hal.archives-ouvertes.fr/hal-03565966
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Submitted on : Monday, July 18, 2022 - 11:07:47 AM
Last modification on : Wednesday, July 20, 2022 - 3:54:05 PM
Long-term archiving on: : Wednesday, October 19, 2022 - 7:04:44 PM

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Faten Souayfan, Emmanuel Rozière, Michaël Paris, Dimitri Deneele, Ahmed Loukili, et al.. 29Si and 27Al MAS NMR spectroscopic studies of activated metakaolin-slag mixtures. Construction and Building Materials, 2022, 322, pp.126415. ⟨10.1016/j.conbuildmat.2022.126415⟩. ⟨hal-03565966⟩

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