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 | |
| Publication status | Published - 1 Sep 2000 |
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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 journal › Article
TY - JOUR
T1 - Aluminum-27 solid state NMR spectroscopic studies of chloride binding in Portland cement and blends
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
Y1 - 2000/9/1
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=0034271261&partnerID=8YFLogxK
U2 - 10.1023/A:1004824100029
DO - 10.1023/A:1004824100029
M3 - Article
AN - SCOPUS:0034271261
VL - 35
SP - 4275
EP - 4288
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 17
ER -