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Effet of carbonation on alkali-activated slag paste
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 car- bonation of waterglass-activated slag pastes is not altered by the presence of either of the organic additives used in the study.
Effet of carbonation on alkali-activated slag paste
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 car- bonation of waterglass-activated slag pastes is not altered by the presence of either of the organic additives used in the study.
Effet of carbonation on alkali-activated slag paste
Einfluß der Carbonisierung auf alkali-aktivierte Schlackenpaste
Palacios, M. (author) / Puertas, F. (author)
Journal of the American Ceramic Society ; 89 ; 3211-3221
2006
11 Seiten, 5 Bilder, 9 Tabellen, 26 Quellen
Article (Journal)
English
Hochofenschlacke , Portlandzement , Natronlauge , Natriumsilicat , Aktivierung (Chemie) , Carbonisieren , Paste , chemische Reaktion , Thermogravimetrie , Differenzialthermoanalyse , Fourier-Transform-Infrarotspektroskopie , magnetische Kernresonanz , Calciumcarbonat , Kieselgel , Aluminiumoxid , Partikelgrößenverteilung , Viskosität , Dichte (Masse) , Gewichtsverlust
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