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Innovative processing for cement materials
Hillebrandite can be synthesized by hydrothermal treatment at around 200 deg C. By heating at 500 deg C or above, it is possible to obtain beta-C2S without altering the original specific surface area. In other words, ultrafine beta-C2S can be obtained by low-temperature synthesis, without resorting to the process of pulverizing. The beta-C2S from hillebrandite has high hydration reactivity that is dependent on curing temperature. Hydration is completed in 28 d at 25 deg C and in 1 d at 80 deg C. The Ca/Si ratio of the C-S-H formed was between 1.95 and 2.0, and almost no Ca(OH)2 is formed. This type of hydration behavior is quite different from what has been reported in the past. The authors believe that the water film at the time of reaction is very thin, and therefore the reaction progresses in situ, with almost no movement of Ca ions and silicate anions. Such highly reactive beta-C2S has large potential for industrial applications such as belite-based cements. By taking a different approach from the conventional ones for investigating the synthesis of beta-C2S via hydrothermal or mechanochemical treatment, and its attendant behavior, the authors have been able to show novel characteristics of and new possibilities for beta-C2S.
Innovative processing for cement materials
Hillebrandite can be synthesized by hydrothermal treatment at around 200 deg C. By heating at 500 deg C or above, it is possible to obtain beta-C2S without altering the original specific surface area. In other words, ultrafine beta-C2S can be obtained by low-temperature synthesis, without resorting to the process of pulverizing. The beta-C2S from hillebrandite has high hydration reactivity that is dependent on curing temperature. Hydration is completed in 28 d at 25 deg C and in 1 d at 80 deg C. The Ca/Si ratio of the C-S-H formed was between 1.95 and 2.0, and almost no Ca(OH)2 is formed. This type of hydration behavior is quite different from what has been reported in the past. The authors believe that the water film at the time of reaction is very thin, and therefore the reaction progresses in situ, with almost no movement of Ca ions and silicate anions. Such highly reactive beta-C2S has large potential for industrial applications such as belite-based cements. By taking a different approach from the conventional ones for investigating the synthesis of beta-C2S via hydrothermal or mechanochemical treatment, and its attendant behavior, the authors have been able to show novel characteristics of and new possibilities for beta-C2S.
Innovative processing for cement materials
Innovative Verarbeitung von Zementwerkstoffen
Ishida, E.H. (Autor:in) / Isu, N. (Autor:in)
MRS Bulletin ; 26 ; 895-898
2001
4 Seiten, 6 Bilder, 44 Quellen
Aufsatz (Zeitschrift)
Englisch
hydraulischer Zement , Belit , Dicalciumsilicat , Calciumsilicathydrat , hydrothermales Verfahren , Morphologie , Hydratation , thermische Zersetzung , spezifische Oberfläche , magnetische Kernresonanz , Transmissionselektronenmikroskopie , Röntgenbeugung , Erhärten (Zementabbinden) , Elektronenbeugung
Innovative Processing for Cement Materials
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