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Influence of the microsilica state on pozzolanic reaction rate

Rojas, M.I.S. de / Rivera, J. / Frias, M.

Silica fume is generally supplied as an ultrafine powder in its original state, densified or in suspension. The difference in states should not influence the pozzolanic behaviour of this by-product in a cementitious matrix. In the present work, experimental results relating to pozzolanic reaction have been obtained by different methods: a chemical method, in which lime fixed by pozzolanic material through time is quantified, and a physicochemical method based on the Langavant calorimeter. By the second method, information regarding silica fume is obtained from the value of heat of hydration released by a mortar containing this by-product. These results show that the silica fume in its densified state considerably decreases its chemical reactivity with calcium hydroxide (pozzolanic activity).

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Influence of the microsilica state on pozzolanic reaction rate

Rojas, M.I.S. de / Rivera, J. / Frias, M.

Silica fume is generally supplied as an ultrafine powder in its original state, densified or in suspension. The difference in states should not influence the pozzolanic behaviour of this by-product in a cementitious matrix. In the present work, experimental results relating to pozzolanic reaction have been obtained by different methods: a chemical method, in which lime fixed by pozzolanic material through time is quantified, and a physicochemical method based on the Langavant calorimeter. By the second method, information regarding silica fume is obtained from the value of heat of hydration released by a mortar containing this by-product. These results show that the silica fume in its densified state considerably decreases its chemical reactivity with calcium hydroxide (pozzolanic activity).

Influence of the microsilica state on pozzolanic reaction rate

Rojas, M.I.S. de / Rivera, J. / Frias, M.

Silica fume is generally supplied as an ultrafine powder in its original state, densified or in suspension. The difference in states should not influence the pozzolanic behaviour of this by-product in a cementitious matrix. In the present work, experimental results relating to pozzolanic reaction have been obtained by different methods: a chemical method, in which lime fixed by pozzolanic material through time is quantified, and a physicochemical method based on the Langavant calorimeter. By the second method, information regarding silica fume is obtained from the value of heat of hydration released by a mortar containing this by-product. These results show that the silica fume in its densified state considerably decreases its chemical reactivity with calcium hydroxide (pozzolanic activity).

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Title:

Influence of the microsilica state on pozzolanic reaction rate

Contributors:

Rojas, M.I.S. de (author) / Rivera, J. (author) / Frias, M. (author)

Published in:

Cement and Concrete Research ; 29 ; 945-949

Publication date:

1999

Size:

5 Seiten, 13 Quellen

ISSN:

DOI:

https://doi.org/10.1016/S0008-8846(99)00085-X

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Siliciumoxid , Reaktionskinetik , Verdichtung , Kalorimeter , Hydratisieren , Mörtel , Sand , Hydratationswärme , anorganische Verbindung , Mikrosilica

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