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Hydration and pH behavior of the cement prepared from the mixture of haüyne-containing clinker, anhydrite and blastfurnace slag
Four types of cement were prepared by mixing haüyne-containing clinker, anhydrite and blastfurnace slag (HAS cement), and their hydration reaction and pH behavior were investigated. HAS cement pastes cured for 3 to 180d contained ettringite, calcium silicate hydrate (C-S-H) and (Al(OH)3) gel as hydrates, but neither (Ca(OH)2) nor monosulfate hydrate. Measured pH values of the liquid phases coexisting with hardened HAS cement pastes were in the range of 11.3 to 12.3, and each of them agreed well with the pH value calculated from ionic concentrations in the liquid phase. Final hydrate of each cement paste was estimated from chemical composition of cement, and then a final pH of liquid phase was presumed from CaO/SiO2 ratio of estimated C-S-H. Measured pH showed similar tendency to the estimated final pH, but the former grew relatively higher than the latter especially in the range of lower pH. It was considered that coexisting alkali ions remarkably influenced liquid phase in that pH range. The compressive strengths of HAS cement mortars cured for 28d were about 37 to 39 N/mm2.
Hydration and pH behavior of the cement prepared from the mixture of haüyne-containing clinker, anhydrite and blastfurnace slag
Four types of cement were prepared by mixing haüyne-containing clinker, anhydrite and blastfurnace slag (HAS cement), and their hydration reaction and pH behavior were investigated. HAS cement pastes cured for 3 to 180d contained ettringite, calcium silicate hydrate (C-S-H) and (Al(OH)3) gel as hydrates, but neither (Ca(OH)2) nor monosulfate hydrate. Measured pH values of the liquid phases coexisting with hardened HAS cement pastes were in the range of 11.3 to 12.3, and each of them agreed well with the pH value calculated from ionic concentrations in the liquid phase. Final hydrate of each cement paste was estimated from chemical composition of cement, and then a final pH of liquid phase was presumed from CaO/SiO2 ratio of estimated C-S-H. Measured pH showed similar tendency to the estimated final pH, but the former grew relatively higher than the latter especially in the range of lower pH. It was considered that coexisting alkali ions remarkably influenced liquid phase in that pH range. The compressive strengths of HAS cement mortars cured for 28d were about 37 to 39 N/mm2.
Hydration and pH behavior of the cement prepared from the mixture of haüyne-containing clinker, anhydrite and blastfurnace slag
Hydratation und pH-Verhalten eines Zements aus einer Mischung aus Haüyne-haltigem Klinker, Anhydrit und Hochofenschlacke
Takuma, Yasuhisa (author) / Fujita, Hideki (author) / Sakamoto, Hiroyuki (author) / Kobayashi, Kumiko (author) / Haga, Kazuko (author) / Uchida, Shunichiro (author)
Journal of the Ceramic Society of Japan. International Edition ; 104 ; 1044-1052
1996
9 Seiten, 10 Bilder, 7 Tabellen, 18 Quellen
Article (Journal)
English
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