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A platform for research: civil engineering, architecture and urbanism
Analysis of setting mechanism of low-cement castables (V): Influence of magnesia powder on the setting of alumina-magnesia low-cement castables
The influence of magnesia powder on the setting of alumina-magnesia low-cement castables was investigated and the setting mechanism of low-cement castables is discussed. The Mg2+ ion concentration in the capillary water increased with a decrease in the grain size of magnesia powder in the castable and the setting was accelerated. Accordingly, Mg2+ ions influenced the coagulation of the colloid. We confirmed our hypothesis that setting can occur in a low-cement type alumina-magnesia castable containing no alumina cement. In alumina cement-free alumina-magnesia castables the setting was controlled by polyvalent cations such as Mg2+ and Ca2+ dissolved from magnesia powder. Changes in castable characteristics with setting of the alumina cement-free castable were the same as a castable with alumina cement except for the time dependence. Therefore, polyvalent cations but not alumina cement are essential for the setting of low-cement castables. Magnesia powder is a polyvalent ion supplier.
Analysis of setting mechanism of low-cement castables (V): Influence of magnesia powder on the setting of alumina-magnesia low-cement castables
The influence of magnesia powder on the setting of alumina-magnesia low-cement castables was investigated and the setting mechanism of low-cement castables is discussed. The Mg2+ ion concentration in the capillary water increased with a decrease in the grain size of magnesia powder in the castable and the setting was accelerated. Accordingly, Mg2+ ions influenced the coagulation of the colloid. We confirmed our hypothesis that setting can occur in a low-cement type alumina-magnesia castable containing no alumina cement. In alumina cement-free alumina-magnesia castables the setting was controlled by polyvalent cations such as Mg2+ and Ca2+ dissolved from magnesia powder. Changes in castable characteristics with setting of the alumina cement-free castable were the same as a castable with alumina cement except for the time dependence. Therefore, polyvalent cations but not alumina cement are essential for the setting of low-cement castables. Magnesia powder is a polyvalent ion supplier.
Analysis of setting mechanism of low-cement castables (V): Influence of magnesia powder on the setting of alumina-magnesia low-cement castables
Maeda, Eizo (author) / Kakuma, Sadao (author)
2013
8 Seiten, 7 Bilder, 1 Tabelle, 8 Quellen
Article (Journal)
English
Tonerde , Kapillarwasser , Kolloid , Ionenkonzentration , Koagulation , Magnesia , Kation , Zeitabhängigkeit , Aluminate , Korngröße , Magnesit , Tonerdezement , zementarmer Feuerbeton , ungeformtes Feuerfesterzeugnis , Calciumaluminatbinder , Gießbarkeit , Abbindung , Ansteifen (hydraulisch) , Abbindebeschleuniger , härtendes Bindemittel
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