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Formation of thaumasite in synthetic cement mineral slurries

Purnell, P. / Francis, O.J. / Page, C.L.

In slurries prepared from either pure predominantly triclinic-C3S or from monoclinic-alite/belite mixtures, with various additions of alumina, exposure to conditions known to initiate thaumasite formation in cement pastes caused only the alite/belite samples to form thaumasite within 100 days. Ettringite was also formed in these samples when alumina had been added. In the pure C3S samples, only gypsum was produced. It is suggested that the alumina content of the pure C3S was insufficient to catalyse thaumasite formation over this timescale and the added alumina had no effect. Thus it appears that aluminium ions must be present within the structure of the anhydrous calcium silicate minerals if thaumasite is to be formed readily.

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Formation of thaumasite in synthetic cement mineral slurries

Purnell, P. / Francis, O.J. / Page, C.L.

In slurries prepared from either pure predominantly triclinic-C3S or from monoclinic-alite/belite mixtures, with various additions of alumina, exposure to conditions known to initiate thaumasite formation in cement pastes caused only the alite/belite samples to form thaumasite within 100 days. Ettringite was also formed in these samples when alumina had been added. In the pure C3S samples, only gypsum was produced. It is suggested that the alumina content of the pure C3S was insufficient to catalyse thaumasite formation over this timescale and the added alumina had no effect. Thus it appears that aluminium ions must be present within the structure of the anhydrous calcium silicate minerals if thaumasite is to be formed readily.

Formation of thaumasite in synthetic cement mineral slurries

Purnell, P. / Francis, O.J. / Page, C.L.

In slurries prepared from either pure predominantly triclinic-C3S or from monoclinic-alite/belite mixtures, with various additions of alumina, exposure to conditions known to initiate thaumasite formation in cement pastes caused only the alite/belite samples to form thaumasite within 100 days. Ettringite was also formed in these samples when alumina had been added. In the pure C3S samples, only gypsum was produced. It is suggested that the alumina content of the pure C3S was insufficient to catalyse thaumasite formation over this timescale and the added alumina had no effect. Thus it appears that aluminium ions must be present within the structure of the anhydrous calcium silicate minerals if thaumasite is to be formed readily.

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Title:

Formation of thaumasite in synthetic cement mineral slurries

Additional title:

Thaumasitbildung in synthetischen Zementmineral-Schlämmen

Contributors:

Purnell, P. (author) / Francis, O.J. (author) / Page, C.L. (author)

Published in:

International Conference on Thaumasite in Cementitious Materials, 1 ; 1-5

Publication date:

2002

Size:

5 Seiten, 2 Bilder, 1 Tabelle, 13 Quellen

ISBN:

Type of media:

Conference paper

Type of material:

Storage medium

Language:

English

Keywords:

Alit , Aluminiumion , Aluminiumoxid , Belit , Calciumsilicat , Ettringit , feste Lösung , Gips , monokline Kristallstruktur , Röntgendiffraktion , Schlamm , Thaumasit , trikline Kristallstruktur , Zement

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