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

doi:10.1023/A:1004824100029

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 journal › Article › peer-review

23 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 language	English
Pages (from-to)	4275-4288
Number of pages	14
Journal	Journal of Materials Science
Volume	35
Issue number	17
DOIs	https://doi.org/10.1023/A:1004824100029
Publication status	Published - 1 Sept 2000

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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

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, C6A{\=S}3H32 (3CaO·Al2O3·3CaSO4·32H2O, or C3A·3CaSO4·32H2O), and the AFm (Aluminate Ferrite mono-) phases calcium mono-sulphoaluminate, C4A{\=S}H12 (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.",

author = "Chudek, {J. A.} and G. Hunter and Jones, {M. R.} and Scrimgeour, {S. N.} and Hewlett, {P. C.} and Kudryavtsev, {A. B.}",

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AU - Chudek, J. A.

AU - Hunter, G.

AU - Jones, M. R.

AU - Scrimgeour, S. N.

AU - Hewlett, P. C.

AU - Kudryavtsev, A. B.

PY - 2000/9/1

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AB - 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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ER -

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

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