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Analysis of the setting mechanism of low-cement castables (II): Changes of Ca2+ ion concentration in the capillary water during setting
The profile of Ca2+ ion concentration changes in the capillary water of low-cement castables (LCC) containing organic deflocculant, during setting, shows three characteristic regions, including (1) initial concentration value, (2) dissolution rate, and (3) a threshold of setting. The author considered that they determine the setting time. Hence, he analyzed the Ca2+ ion concentration changes and investigated the relationship between the three characteristic regions and the setting time, in which some well-known influences were varied, including: setting time variation, temperature, kinds of alumina cement, retarder, and deflocculant. The setting time variations could be explained by the three characteristic effects. The temperature change mainly altered the dissolution rate. The kind of alumina cement changed the initial value and the dissolution rates. The retarder and deflocculant affected both the dissolution rate and the threshold of setting. The dissolution rate was not constant and was delayed in the middle stage, conceivably due to the characteristics of the alumina cement.
Analysis of the setting mechanism of low-cement castables (II): Changes of Ca2+ ion concentration in the capillary water during setting
The profile of Ca2+ ion concentration changes in the capillary water of low-cement castables (LCC) containing organic deflocculant, during setting, shows three characteristic regions, including (1) initial concentration value, (2) dissolution rate, and (3) a threshold of setting. The author considered that they determine the setting time. Hence, he analyzed the Ca2+ ion concentration changes and investigated the relationship between the three characteristic regions and the setting time, in which some well-known influences were varied, including: setting time variation, temperature, kinds of alumina cement, retarder, and deflocculant. The setting time variations could be explained by the three characteristic effects. The temperature change mainly altered the dissolution rate. The kind of alumina cement changed the initial value and the dissolution rates. The retarder and deflocculant affected both the dissolution rate and the threshold of setting. The dissolution rate was not constant and was delayed in the middle stage, conceivably due to the characteristics of the alumina cement.
Analysis of the setting mechanism of low-cement castables (II): Changes of Ca2+ ion concentration in the capillary water during setting
Maeda, Eizo (author)
Journal of the Technical Association of Refractories, Japan ; 31 ; 221-228
2011
8 Seiten, 10 Bilder, 2 Tabellen, 15 Quellen
Article (Journal)
English
feuerfestes Material , zementarmer Feuerbeton , Entflockungsmittel , Fixierzeit , Auflösung , Retarder , Calciumaluminat , Calciumaluminatbinder , Kapillarwasser , Calciumion , feuerfestes Spinellerzeugnis , Abbindung , Ansteifen (hydraulisch) , Zentrifugieren , ultrafeines Pulver , Koagulation , Kolloid
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