Suppression of antagonistic hydration reactions in blended...

C - Chemistry – Metallurgy – 04 – B

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C04B 28/08 (2006.01) B28C 5/00 (2006.01) C04B 22/00 (2006.01)

Patent

CA 2747872

Method for suppressing antagonistic hydration reactions in Portland fly ash cement involves the use of unponded fly ash that is pre-hydrated, preferably as an aqueous slurry wherein fly ash, preferably having an alkaline earth metal oxide of at least 10% by weight, is soaked, whereby the hydration reaction of the resultant mixed fly ash and cement is accelerated when these components are mixed together with water to hydrate the cement. Blended Portland cement/fly ash compositions of the invention will also have higher early strength as well as shorter set time compared to untreated blends.

L'invention concerne un procédé de suppression de réactions d'hydratation antagonistes dans du ciment Portland artificiel aux cendres volantes impliquant l'utilisation de cendres volantes non compactées préhydratées, de préférence sous la forme d'une boue aqueuse. Les cendres volantes, présentant de préférence un oxyde de métal alcalino-terreux d'au moins 10 % en poids, sont imprégnées d'eau, la réaction d'hydratation du mélange de cendres volantes et de ciment obtenu étant accélérée lorsque ces composants sont mélangés à de l'eau pour l'hydratation du ciment. Les compositions de ciment Portland mélangé/cendres volantes selon l'invention présentent également une résistance initiale plus importante et un temps de durcissement plus court que des mélanges non traités.

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