Use in a hydraulic binder composition of a dry-ground...

B - Operations – Transporting – 02 – C

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B02C 23/06 (2006.01) C04B 14/28 (2006.01) C04B 24/26 (2006.01) C04B 28/02 (2006.01) C04B 40/00 (2006.01) C09C 1/02 (2006.01) C09C 3/04 (2006.01) C09C 3/10 (2006.01)

Patent

CA 2679294

The invention relates to the use, in a hydraulic binder-based composition, of a calcium carbonate characterized in that it is obtained by dry-grinding, and in that it is dry-ground in the presence of a grinding aid agent that is a (meth)acrylic acid copolymer with a monomer carrying an alkoxy or hydroxy polyalkylene glycol function. The invention also concerns the hydraulic binder-based compositions thus obtained.

L'invention réside dans l'utilisation dans une composition à base d'un liant hydraulique, d'un carbonate de calcium caractérisé en ce qu'il est obtenu par un broyage à sec d'une part, et en ce qu'il est broyé à sec en présence d'un agent d'aide au broyage qui est un copolymère de l'acide (méth)acrylique avec un monomère portant une fonction alcoxy ou hydroxy polyalkylèneglycol d'autre part. L'invention concerne aussi les compositions à base d'un liant hydraulique ainsi obtenues.

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