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Effect of Carbonation on Alkali-Activated Slag Paste

AuthorsPalacios, Marta ; Puertas, F.
Keywordsslag pastes
Portland cement
Issue DateAug-2003
PublisherJohn Wiley & Sons
CitationJournal of the American Ceramic Society 89(10): 3211–3221(2006)
Abstract[EN]Carbonation on waterglass- and NaOH-activated slag pastes was analyzed and compared with carbonation in Portland cement pastes to determine possible differences. Thermogravimetry-differential thermal analysis (TG/DTA), Fourier-transform infrared spectrometry, and nuclear magnetic resonance were used to determine the effects on the main reaction products. According to the TG/DTA results, carbonate precipitation following carbonation is much more intense in Portland cement pastes than in alkali-activated slag pastes. This may be attributed to the fact that in Portland cement paste both the portlandite and the C–S–H gel can be carbonated, whereas in alkali-activated slag pastes, only the C–S–H gel is carbonated directly. In both systems, carbonation leads to the formation of CaCO3, Si-rich C–S–H gel, silica gel, and alumina. The carbonation of waterglass-activated slag pastes is not altered by the presence of either of the organic additives used in the study.
Publisher version (URL)http://dx.doi.org/10.1111/j.1551-2916.2006.01214.x
Appears in Collections:(IETCC) Artículos
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