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Hydration of alkali-activated ground granulated blast furnace slag
The hydration of GGBFS (ground granulated blast furnace slag) at 25 deg C in controlled pH environments was investigated during 28 days of hydration. GGBFS was activated by NaOH, and it was found that the rate of reaction depends on the pH of the starting solution. The main product was identified as CaO-SiO2-H2O, and, in the pastes with high pH, hydrotalcite was observed at later stages of hydration. The pH of the mixing solution should be higher than pH 11.5 to effectively activate the hydration of GGBFS. As deduced from very low electrical conductivity measurements, GGBFS pastes had very tortuous and disconnected pores. The effect of the pH of the aqueous solution on the composition, microstructure and properties of alkali-activated GGBFS pastes are also discussed.
Hydration of alkali-activated ground granulated blast furnace slag
The hydration of GGBFS (ground granulated blast furnace slag) at 25 deg C in controlled pH environments was investigated during 28 days of hydration. GGBFS was activated by NaOH, and it was found that the rate of reaction depends on the pH of the starting solution. The main product was identified as CaO-SiO2-H2O, and, in the pastes with high pH, hydrotalcite was observed at later stages of hydration. The pH of the mixing solution should be higher than pH 11.5 to effectively activate the hydration of GGBFS. As deduced from very low electrical conductivity measurements, GGBFS pastes had very tortuous and disconnected pores. The effect of the pH of the aqueous solution on the composition, microstructure and properties of alkali-activated GGBFS pastes are also discussed.
Hydration of alkali-activated ground granulated blast furnace slag
Hydratisierung von gemahlener alkaliaktivierter granulierter Hochofenschlacke
Song, S. (author) / Sohn, D. (author) / Jennings, H.M. (author) / Mason, T.O. (author)
Journal of Materials Science ; 35 ; 249-257
2000
9 Seiten, 7 Bilder, 1 Tabelle, 45 Quellen
Article (Journal)
English
Hochofenschlacke , Aktivierungsmittel , chemische Aktivierung , Hydratisieren , pH-Wert , Calciumsilicathydrat , elektrische Leitfähigkeit , Mikrostruktur , Kalorimetrie , Porosität , freie Energie , Enthalpie , granulierte Schlacke , Wasserabbinden von Zement , Erhärten (Zementabbinden) , Impedanzspektrometrie , Hydrotalkit
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