Aqueous silica suspensions and use thereof in inorganic...

C - Chemistry – Metallurgy – 04 – B

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C04B 22/06 (2006.01) C04B 14/06 (2006.01) C04B 24/24 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2248201

An aqueous suspension including a mixture of at least one aqueous precipitated silica suspension and at least one latex, wherein said aqueous precipitated silica suspension has a dry matter content of 10-40 wt % and a viscosity of less than 4.10 Pa.s for a shear of 50 s?-1¿, and produces, after centrifuging at 7500 rpm for 30 minutes, a supernatant containing more than 50 % of the weight of the silica originally in the suspension. Said suspension may be used in inorganic binder compositions and concrete compositions.

Cette invention concerne une suspension aqueuse comprenant un mélange d'au moins une suspension aqueuse de silice précipitée et d'au moins un latex, dans lequel ladite suspension aqueuse de silice précipitée présente une teneur en matière sèche comprise entre 10 et 40 % en poids, a une viscosité inférieure à 4.10-2 Pa.s pour un cisaillement de 50 s-1 et produit après centrifugation à 7 500 tours par minute pendant 30 minutes un surnageant contenant plus de 50 % du poids de la silice initialement en suspension. Cette suspension est utilisable dans des compositions à base d'un liant minéral, et dans des compositions de béton.

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