Sulfate resistant cement

Details Sulfate resistant cement Sulfate resistant cement

C - Chemistry, Metallurgy

04

B

C04B 7/19 (2006.01)

Patent

CA 2679879

A mixed cement which consists mainly of ground granulated blast furnace slag having an aluminum proportion of 12-17.5 mass% and portland cement, the content of the ground granulated blast furnace slag being 10-60 mass%. The mixed cement further contains gypsum having a specific surface area of 7,000 cm2/g or larger in an amount of 2-4 mass% in terms of SO3 amount. Use of this mixed cement as a raw material for concrete is effective in inhibiting the concrete from expanding even when in contact over long with soil containing a sulfate remaining therein.

L'invention concerne un ciment mixte, constitué principalement de laitier de haut-fourneau granulé broyé, dont les proportions sont les suivantes : aluminium de 12 à 17,5 % en masse ; ciment Portland ; laitier de haut-fourneau granulé broyé 10 % à 60 % en masse. Le ciment mixte comprend en outre du gypse dont la surface spécifique est de 7000 cm~/gramme ou plus et la quantité de 2 à 4 %en masse en termes de quantité de SO3. L'utilisation de ce ciment mixte comme matière première du béton et efficace pour prévenir l'expansion du béton même après un contact prolongé avec un sol contenant des restes de sulfate.

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