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A platform for research: civil engineering, architecture and urbanism
29Si and 27Al MAS NMR spectroscopic studies of activated metakaolin-slag mixtures
https://orcid.org/0000-0002-1982-980X
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Highlights Activated metakaolin and metakaolin-slag mixtures studied at high H2O/Na2O ratios. Different approaches of Si and Al NMR spectra analysis are compared. Formation of a heterogeneous phase involved in the transformation of 3D geopolymer network to C-A-S-H. Higher reactivity of metakaolin detected in slag-metakaolin 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.
29Si and 27Al MAS NMR spectroscopic studies of activated metakaolin-slag mixtures
https://orcid.org/0000-0002-1982-980X
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Highlights Activated metakaolin and metakaolin-slag mixtures studied at high H2O/Na2O ratios. Different approaches of Si and Al NMR spectra analysis are compared. Formation of a heterogeneous phase involved in the transformation of 3D geopolymer network to C-A-S-H. Higher reactivity of metakaolin detected in slag-metakaolin 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.
29Si and 27Al MAS NMR spectroscopic studies of activated metakaolin-slag mixtures
https://orcid.org/0000-0002-1982-980X
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Highlights Activated metakaolin and metakaolin-slag mixtures studied at high H2O/Na2O ratios. Different approaches of Si and Al NMR spectra analysis are compared. Formation of a heterogeneous phase involved in the transformation of 3D geopolymer network to C-A-S-H. Higher reactivity of metakaolin detected in slag-metakaolin 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.
29Si and 27Al MAS NMR spectroscopic studies of activated metakaolin-slag mixtures
Souayfan, Faten (author) / Rozière, Emmanuel (author) / Paris, Michaël (author) / Deneele, Dimitri (author) / Loukili, Ahmed (author) / Justino, Christophe (author)
2022-01-09
Article (Journal)
Electronic Resource
English
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