Cement admixture for improved slump life

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 24/26 (2006.01) C04B 24/32 (2006.01) C04B 28/02 (2006.01) C08F 220/04 (2006.01) C08F 220/12 (2006.01)

Patent

CA 2342011

Described are polymers and cement admixtures which reduce drop in fluidity with time. Said admixture comprises at least one polymer of the present invention and at least one polymer A. The polymer of the present invention comprises side chains of which at least 10 weight-% can be cleaved in alkaline medium. The polymer of the present invention is an acrylic polymer which comprises side chains connected to the backbone by ester linkages. These side chains may be alkyl, hydroxy alkyl, cycloalkyl or polyoxyalkylene groups. Polymer A is a cement dispersing agent. The combination of polymer A with the polymer of the present invention in a weight ratio of 0.1:10-10:1, and preferably 1:10-10:1 reduces the drop in fluidity with time of cementitious compositions.

Divulgation de polymères et de mélanges de ciment qui réduisent la perte de fluidité au cours du temps. Lesdits mélanges comportent au moins un polymère de la présente invention et au moins un polymère A. Le polymère de la présente invention comporte des chaînes latérales dont au moins 10 % en poids peuvent être clivées dans un milieu alcalin. Le polymère de la présente invention est un polymère acrylique qui comporte des chaînes latérales reliées au squelette par des liaisons de type ester. Ces chaînes latérales peuvent être des alkyles, des hydroxyalkyles, des cycloalkyles ou des polyoxyalkylènes. Le polymère A est un agent de dispersion du ciment. La combinaison du polymère A et du polymère de la présente invention dans un rapport massique de 0,1/10 à 10/1, de préférence de 1/10 à 10/1, permet de réduire la perte de fluidité au cours du temps des compositions cimentaires.

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