Accelerator composition

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 40/00 (2006.01) C04B 22/06 (2006.01) C04B 22/14 (2006.01) C04B 22/16 (2006.01) C04B 24/04 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2461270

An alkali-free accelerator for use with spray-applied cementitious compositions such as concrete and mortar is the reaction product in aqueous medium of amorphous aluminium hydroxide, aluminium sulphate, formic acid and phosphoric acid. These accelerators performs as well as known alkali-free accelerators and are exceptionally stable, even in hot conditions.

L'invention concerne un accélérateur exempt d'alcalins destiné à être employé avec des compositions à base de ciment appliquées par projection, telles que du béton et du mortier. Ledit accélérateur est obtenu par réaction d'hydroxyde d'aluminium amorphe, de sulfate d'aluminium, d'acide formique et d'acide phosphorique dans un milieu aqueux. Les accélérateurs selon l'invention offrent une efficacité comparable aux accélérateurs exempts d'alcalins connus, et sont caractérisés par une stabilité exceptionnelle, même à température élevée.

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