High early strength cement and additives and methods for...

Details High early strength cement and additives and methods for... High early strength cement and additives and methods for...

C - Chemistry, Metallurgy

04

B

C04B 24/24 (2006.01) C04B 22/12 (2006.01) C04B 24/10 (2006.01) C04B 24/12 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2374525

A method for improving early strength of cements comprising introducing into a cement, preferably during the grinding thereof, (a) at least one water reducer comprising a polyoxyalkylene polymer; (b) a sugar; and (c) an alkali or alkaline earth metal chloride. In further exemplary embodiments, the polyoxyalkylene polymer preferably comprises a comb polymer having a backbone and pendant groups. Optionally, an amine may be included with the additives. Exemplary additives and cements and cementitious compositions, preferably blended cements, and more most preferably pozzolanic cements, comprising the additives are also disclosed.

L'invention concerne un procédé permettant d'améliorer la résistance initiale des ciments. Ce procédé consiste à introduire dans un ciment, de préférence au cours de son broyage, (a) au moins un réducteur d'eau comprenant un polymère de polyoxyalkylène ; (b) un sucre ; et (c) un alcali ou un chlorure métallique alcalino-terreux. Dans d'autres modes de réalisation exemplaires, le polymère de polyoxyalkylène comprend de préférence un polymère peigné présentant une certaine structure et des groupes en suspension. Une amine peut éventuellement être incluse aux additifs. L'invention porte également sur des additifs et des ciments exemplaires, des compositions à base de ciment, de préférence des ciments de mélange, mieux encore des ciments pouzzolaniques qui comprennent ces additifs.

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