High molecular weight additives for calcined gypsum and...

Details High molecular weight additives for calcined gypsum and... High molecular weight additives for calcined gypsum and...

C - Chemistry, Metallurgy

04

B

C04B 28/14 (2006.01) C04B 22/14 (2006.01) C04B 24/26 (2006.01) E04F 15/12 (2006.01)

Patent

CA 2477709

A mixture is used in conjunction with water is used for preparing a slurry that hydrates to form an exterior gypsum cement. The mixture includes 30-70 % by weight hydraulic cement, 30-70 % by weight calcined gypsum and 0.05-2.5 % polycarboxylate. When the mixture is added to water less than 40 weight % based on the weight of the mixture, a slurry is formed that expands very little while it cures.

L'invention concerne un mélange utilisé avec de l'eau pour préparer un coulis de ciment qui s'hydrate pour former un plâtre dur d'extérieur. Ce mélange comprend 30 à 70 % en poids de ciment hydraulique, 30 à 70 % en poids de gypse calciné et 0,05 à 2,5 % de polycarboxylate. En ajoutant de l'eau à ce mélange dans une quantité inférieure à 40 % du poids du mélange, on obtient un coulis de ciment présentant un faible taux d'expansion après durcissement.

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