Ester-based concrete surface retarders

Details Ester-based concrete surface retarders Ester-based concrete surface retarders

C - Chemistry, Metallurgy

04

B

C04B 41/53 (2006.01) B28B 7/36 (2006.01) B28B 7/38 (2006.01) C04B 24/06 (2006.01)

Patent

CA 2732852

Compositions and methods of the invention for retarding the surface of a concrete or other hydratable cementitious composition involve the use of at least one alkyl-ester-of-hydroxycarboxy compound contained in the form of particles or as a discontinuous phase distributed within a continuous non-aqueous carrier phase that is spray-applicable in liquid form. The set retarder helps to achieve lower pH and to avoid irritating fogs during spray application of the surface retarder when compared to prior art acid-containing surface retarders.

Les compositions et procédés de l'invention destinés à retarder la prise de la surface d'un béton ou d'une autre composition cimentée hydratable comprennent l'utilisation d'au moins un composé hydroxycarboxy-ester d'alkyle contenu sous la forme de particules ou en tant que phase discontinue distribuée à l'intérieur d'une phase continue de transporteur non aqueux qui est applicable par pulvérisation sous forme liquide. L'ensemble retardateur aide à obtenir un pH plus faible et à éviter la formation de brouillards irritants pendant l'application par pulvérisation du retardateur de la prise de la surface par comparaison aux retardateurs de la prise de la surface contenant des acides de l'art antérieur.

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