Multi-functional cement dispersants and hydraulic cement...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 24/24 (2006.01) C04B 7/00 (2006.01)

Patent

CA 2394113

A multi-functional cement dispersant contains a graft copolymer obtained by a graft reaction of one or more selected from polyoxyalkylene monoalkylester, polyoxyalkylene monoalkylether and polypropyleneglycol of specified kinds to a copolymer obtained by radical polymerization of a mixture of radical polymerizable monomers containing maleic anhydride and monomers of a specified kind at a specified ratio. Hydraulic cement compositions produced with such a multi-functional cement dispersant have a superior fluidity with reduced loss over time and hardened objects produced from such a composition exhibit a superior early strength and have a low dry shrinkage and a high resistance against freezing and thawing.

Un agent dispersant de ciment multifonctionnel renferme un copolymère greffé obtenu par greffage d'un ou plusieurs monoalkylesters de polyoxyalkylène, de monoalkyléthers de polyoxyalkylène et de polypropylène glycols de types déterminés à un copolymère obtenu par polymérisation radicalaire d'un mélange de monomères polymérisables par voie radicalaire contenant de l'anhydride maléique et des monomères d'un type déterminé selon un rapport déterminé. Les compositions de ciment hydraulique obtenues à partir d'un tel agent dispersant de ciment multifonctionnel ont une fluidité supérieure et présentent moins de perte avec le temps, et les objets durcis obtenus à partir d'une telle composition présentent une résistance initiale supérieure, un faible rétrécissement à sec et une résistance élevée au gel et au dégel.

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