Dispersing agent for high-flow or self-compacting concrete

Details Dispersing agent for high-flow or self-compacting concrete Dispersing agent for high-flow or self-compacting concrete

C - Chemistry, Metallurgy

04

B

C04B 24/26 (2006.01) C04B 24/16 (2006.01) C04B 24/32 (2006.01) C08F 222/20 (2006.01) C08F 226/02 (2006.01)

Patent

CA 2217232

Cement dispersing agents for self-compacting concrete of high flowability, comprising a water-soluble N-vinyl copolymer, prepared by copolymerizing (a) an N-vinyl-lactame or -amide with (b) a polyethylene glycol ester of maleic acid containing 6 to 240 moles of oxy-ethylene groups per molecule and (c) at least one monomer selected from among unsaturated dicarboxylic acids and (d) methallylsulfonic acid. When an aqueous solution of this copolymer is used as an admixture to freshly prepared concrete of even extremely low water-to-cement ratio, a high fluidity, a low decrease in flowability with the progression of time-and a lack of segregation over time is attained.

Agents dispersants du ciment pour béton à auto-compactage et à fluidité élevée, comprenant un copolymère de N-vinylique hydrosoluble, préparé par copolymérisation a) d'une N-vinyl-lactame ou d'un N-vinyl-amide avec b) un ester maléique de polyéthylèneglycol contenant de 6 à 240 moles de groupes oxy-éthylène par molécule et c) au moins un monomère choisi parmi les acides dicarboxyliques insaturés et d) de l'acide méthallylsulfonique. Lorsqu'une solution aqueuse de ce copolymère est ajoutée à du béton fraîchement préparé, même dans un rapport eau-ciment extrêmement faible, on obtient une fluidité élevée, une faible diminution de la fluidité avec le temps et une absence de ségrégation dans le temps.

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