Aluminium-27 solid state NMR spectroscopic studies of chloride binding in Portland cement and blends
作者： J. A. Chudek , G. Hunter , M. R. Jones , S. N. Scrimgeour , P. C. Hewlett
关键词: Ground granulated blast-furnace slag 、 AFm phase 、 Composite material 、 Materials science 、 Ettringite 、 Aluminate 、 Nuclear chemistry 、 Chloride 、 Metakaolin 、 Portland cement 、 Cement
摘要: Alumina-rich pozzolanic and latent hydraulic binders such as pulverised fuel ash, metakaolin, ground granulated blast furnace slag, together with silica fume, are frequently added to Portland cement concrete improve performance retard chloride ingress thereby inhibit chloride-induced corrosion of the carbon steel reinforcement. 27Al{1H} MAS CP/MAS NMR spectroscopies have been used follow both hydration processes blends interactions ion hydrated aluminium species. The spectra aluminate phases were interpretable on basis that AFt (Aluminate Ferrite tri-) phase ettringite, C 6 A $$\overline S _3 $$ H 32(3CaO·Al2O3·3CaSO4·32H2O, or C 3 A·3CaSO4·32H2O), AFm mono-) calcium mono-sulphoaluminate, C 4 A H 12 (3CaO·Al2O3·CaSO4·12H2O, C 3 A·CaSO4·12H2O), lamellar tetracalcium hydrate, C 4 AH 13 (3CaO·Al2O3·Ca(OH)2·12H2O, C 3 A·Ca(OH)2·xH2O) present only species containing octahedrally-coordinated aluminium. In all cases, Friedel's salt (3CaO·Al2O3·CaCl2·10H2O, C 3 A·CaCl2·10H2O) could be identified major chloroaluminate produced by pastes ion.
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