Improved processing additives for hydraulic cements

Details Improved processing additives for hydraulic cements Improved processing additives for hydraulic cements

C - Chemistry, Metallurgy

04

B

C04B 24/12 (2006.01) C04B 28/04 (2006.01)

Patent

CA 2248559

This invention relates to enhancing the compressive strength of cements after 1, 3, 7 and 28 days following hydration and to improving porosity and finished surfaces of the hardened cements and concretes made therefrom. The improved cements are preparedusing certain hydroxylamine additives in amounts of up to 0.1% which preferably are added during grinding of the cement in which case the amines further act as grinding aids.

L'invention concerne l'amélioration de la résistance à la rupture en compression des ciments 1, 3, 7 et 28 jours après l'hydratation, ainsi que de la porosité et des surfaces finies des ciments durcis et du béton fabriqué avec le ciment. Les ciments améliorés sont préparés en utilisant certains additifs à base d'hydroxylamine dans des quantités pouvant aller jusqu'à 0,1 % qui, de préférence, sont ajoutées pendant le broyage du ciment, auquel cas des amines agissent comme agents de mouture.

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