Aluminum-27 solid state NMR spectroscopic studies of chloride binding in Portland cement and blends

J. A. Chudek, G. Hunter, M. R. Jones, S. N. Scrimgeour, P. C. Hewlett, A. B. Kudryavtsev

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    Alumina-rich pozzolanic and latent hydraulic binders such as pulverized fuel ash, metakaolin, and ground granulated blast furnace slag, together with silica fume, are frequently added to Portland cement concrete to improve performance and to retard chloride ingress and thereby inhibit chloride-induced corrosion of the carbon steel reinforcement. 27Al{1H} MAS and CP/MAS NMR spectroscopies have been used to follow both the hydration processes of the cement blends and the interactions of chloride ion with the hydrated aluminum species. The spectra of the hydrated aluminate phases were interpretable on the basis that the AFt (Aluminate Ferrite tri-) phase ettringite, C6AS̄3H32 (3CaO·Al2O3·3CaSO4·32H2O, or C3A·3CaSO4·32H2O), and the AFm (Aluminate Ferrite mono-) phases calcium mono-sulphoaluminate, C4AS̄H12 (3CaO·Al2O3·CaSO4·12H2O, or C3A·CaSO4·12H2O), and the lamellar tetracalcium aluminate hydrate, C4AH13 (3CaO·Al2O3·Ca(OH)2·12H2O, or C3A·Ca(OH)2·xH2O) were present as the only hydrated species containing octahedrally-coordinated aluminum. In all cases, only the AFm phase Friedel's salt (3CaO·Al2O3·CaCl2·10H2O, or C3A·CaCl2·10H2O) could be identified as the major chloroaluminate phase produced by the interactions of the cement pastes with chloride ion.

    Original languageEnglish
    Pages (from-to)4275-4288
    Number of pages14
    JournalJournal of Materials Science
    Volume35
    Issue number17
    DOIs
    Publication statusPublished - 1 Sep 2000

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    Portland cement
    Aluminum
    Ferrite
    Chlorides
    Nuclear magnetic resonance
    Ashes
    Cements
    Pulverized fuel
    Silica fume
    Ions
    Hydrates
    Hydration
    Slags
    Nuclear magnetic resonance spectroscopy
    Carbon steel
    Binders
    Aluminum Oxide
    Calcium
    Reinforcement
    Alumina

    Cite this

    Chudek, J. A. ; Hunter, G. ; Jones, M. R. ; Scrimgeour, S. N. ; Hewlett, P. C. ; Kudryavtsev, A. B. / Aluminum-27 solid state NMR spectroscopic studies of chloride binding in Portland cement and blends. In: Journal of Materials Science. 2000 ; Vol. 35, No. 17. pp. 4275-4288.
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    abstract = "Alumina-rich pozzolanic and latent hydraulic binders such as pulverized fuel ash, metakaolin, and ground granulated blast furnace slag, together with silica fume, are frequently added to Portland cement concrete to improve performance and to retard chloride ingress and thereby inhibit chloride-induced corrosion of the carbon steel reinforcement. 27Al{1H} MAS and CP/MAS NMR spectroscopies have been used to follow both the hydration processes of the cement blends and the interactions of chloride ion with the hydrated aluminum species. The spectra of the hydrated aluminate phases were interpretable on the basis that the AFt (Aluminate Ferrite tri-) phase ettringite, C6AS̄3H32 (3CaO·Al2O3·3CaSO4·32H2O, or C3A·3CaSO4·32H2O), and the AFm (Aluminate Ferrite mono-) phases calcium mono-sulphoaluminate, C4AS̄H12 (3CaO·Al2O3·CaSO4·12H2O, or C3A·CaSO4·12H2O), and the lamellar tetracalcium aluminate hydrate, C4AH13 (3CaO·Al2O3·Ca(OH)2·12H2O, or C3A·Ca(OH)2·xH2O) were present as the only hydrated species containing octahedrally-coordinated aluminum. In all cases, only the AFm phase Friedel's salt (3CaO·Al2O3·CaCl2·10H2O, or C3A·CaCl2·10H2O) could be identified as the major chloroaluminate phase produced by the interactions of the cement pastes with chloride ion.",
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    Aluminum-27 solid state NMR spectroscopic studies of chloride binding in Portland cement and blends. / Chudek, J. A.; Hunter, G.; Jones, M. R.; Scrimgeour, S. N.; Hewlett, P. C.; Kudryavtsev, A. B.

    In: Journal of Materials Science, Vol. 35, No. 17, 01.09.2000, p. 4275-4288.

    Research output: Contribution to journalArticle

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