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Alkaline Activation of Fly Ashes: NMR Study of the Reaction Products

AuthorsPalomo, Ángel; Fernández-Jiménez, Ana; Alonso, S.; Sobrados, Isabel ; Sanz Lázaro, Jesús
Keywordsfly ash
alkalis/alkaline earths
nuclear magnetic resonance
Issue DateJun-2004
PublisherJohn Wiley & Sons
CitationJournal of the American Ceramic Society 87(6): 1141–1145(2004)
AbstractReaction products formed during alkaline activation, with 8M NaOH solutions, of fly ashes have been characterized with 29Si and 27Al magic-angle spinning nuclear magnetic resonance (MASNMR) spectroscopy. In particular, the influence of curing conditions (time and temperature of reaction) has been analyzed. NMR results show the formation of amorphous tecto-silicates in which the amount of aluminum decreases in the two consecutive formed phases. The Si/Al ratio of zeolite precursor obtained at 85°C changes from 0.95 to 1.86 when curing time is increased from 5 h to 1 week. The evolution of the mechanical properties of prepared cements has also been discussed in terms of the phases formed and texture and morphology of samples.
Publisher version (URL)http://dx.doi.org/10.1111/j.1551-2916.2004.01141.x/abstract
Appears in Collections:(IETCC) Artículos
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