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The influence of microsilica on the course of hydration of monocalcium aluminate

Moehmel, S. / Gessner, W. / Bier, T.A. / Parr, C.

Calorimetric curves of mixtures of CA and microsilica show an intermediate peak of heat evolution after about 1 hour of hydration. The extent and the time of occurrence of the intermediate peak is influenced by temperature as well as by the amount and quality of the silica fume used. Experiments have shown that this peak is connected with a sharp increase of the [Al(OH)4] concentration in the liquid phase of the hydrating paste and with the crystallisation of a small amount of calcium aluminate hydrates. A possible explanation of this behaviour, which influences the setting behaviour of Low Cement Castables (LCC) is given.

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The influence of microsilica on the course of hydration of monocalcium aluminate

Moehmel, S. / Gessner, W. / Bier, T.A. / Parr, C.

Calorimetric curves of mixtures of CA and microsilica show an intermediate peak of heat evolution after about 1 hour of hydration. The extent and the time of occurrence of the intermediate peak is influenced by temperature as well as by the amount and quality of the silica fume used. Experiments have shown that this peak is connected with a sharp increase of the [Al(OH)4] concentration in the liquid phase of the hydrating paste and with the crystallisation of a small amount of calcium aluminate hydrates. A possible explanation of this behaviour, which influences the setting behaviour of Low Cement Castables (LCC) is given.

The influence of microsilica on the course of hydration of monocalcium aluminate

Moehmel, S. / Gessner, W. / Bier, T.A. / Parr, C.

Calorimetric curves of mixtures of CA and microsilica show an intermediate peak of heat evolution after about 1 hour of hydration. The extent and the time of occurrence of the intermediate peak is influenced by temperature as well as by the amount and quality of the silica fume used. Experiments have shown that this peak is connected with a sharp increase of the [Al(OH)4] concentration in the liquid phase of the hydrating paste and with the crystallisation of a small amount of calcium aluminate hydrates. A possible explanation of this behaviour, which influences the setting behaviour of Low Cement Castables (LCC) is given.

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Title:

The influence of microsilica on the course of hydration of monocalcium aluminate

Contributors:

Moehmel, S. (author) / Gessner, W. (author) / Bier, T.A. (author) / Parr, C. (author)

Published in:

Calcium Aluminate Cements (CAC), International Conference on Calcium Aluminate Cements, 2001 ; 319-330

Book, Institute of Materials ; 757

Publication date:

2001

Size:

12 Seiten, 7 Bilder, 1 Tabelle, 11 Quellen

ISBN:

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

Mikrosilica , Wasserabbinden von Zement , Hydratisieren , Calciumaluminat , Kalorimetrie , Wärmeerzeugung , Temperatureinfluss , Mischungsverhältnis , Aluminiumhydroxid , flüssige Phase , Suspension , Zementpaste , Kristallisation , Calciumaluminathydrat , Reaktionszeit

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