Cement additive comprising poly(carboxylic acid)-containing...

C - Chemistry – Metallurgy – 04 – B

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C04B 24/26 (2006.01) C04B 24/32 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2360412

A cement additive comprising a polycarboxylic acid type copolymer and/or a salt thereof and a polyalkylene glycol derivative, wherein said polycarboxylic acid type copolymer contains one or more species of copolymers composed of at least an unsaturated polyalkylene glycol type monomer and an unsaturated mono- or dicarboxylic acid type monomer as their monomer components. Concretes in which the additive is used have excellent flow, without significant retarding effect, and a low air entrainment. When used with concrete for steam curing, it allows earlier removal of form work.

L'invention concerne un additif à ciment comprenant un copolymère du type acide polycarboxylique et/ou un sel de celui-ci, ainsi qu'un dérivé de polyalkylèneglycol. Le copolymère du type acide polycarboxylique contient une ou plusieurs espèces de copolymères dont les constituants monomères sont au moins un monomère du type polyalkylèneglycol insaturé et un monomère du type acide monocarboxylique ou dicarboxylique insaturé. Les bétons dans lesquels cet additif est utilisé présentent une excellente fluidité sans effet retardateur de prise notable, et un faible entraînement d'air. Lorsqu'il est utilisé avec du béton dans une opération d'étuvage, cet additif permet par ailleurs de procéder plus tôt au décoffrage.

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