Solubilized defoamers for cementitious compositions

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 28/02 (2006.01) B01D 19/04 (2006.01) B01F 17/00 (2006.01) C04B 24/26 (2006.01) C04B 24/32 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2393625

Solubilizing agents are mixed with water-insoluble defoamers and a dispersant for cementitious compositions to provide an admixture for cementitious compositions that is stable over time. Suitable solubilizing agents include alkoxylated moieties or particles. A cementitious composition is provided that includes cement, water, a water-insoluble defoamer, a dispersant for cementitious compositions, and a solubilizing agent that solubilizes the water- insoluble defoamer. A method is provided for making a cementitious composition that includes mixing cement, water, a water- insoluble defoamer, a dispersant for cementitious compositions, and a solubilizing agent that solubilizes the water-insoluble defoamer.

Selon l'invention, on mélange des agents de solubilisation avec des démousseurs insolubles dans l'eau et un agent dispersant pour compositions à base de ciment afin d'obtenir un produit d'addition pour compositions à base de ciment présentant une stabilité durable. Des fractions ou des particules alcoxylées constituent des agents de solubilisation appropriés. L'invention concerne également une composition à base de ciment comprenant du ciment, de l'eau, un démousseur insoluble dans l'eau, un agent dispersant pour compositions à base de ciment et un agent de solubilisation qui solubilise le démousseur insoluble dans l'eau. L'invention concerne en outre un procédé de fabrication d'une composition à base de ciment qui consiste à mélanger du ciment, de l'eau, un démousseur insoluble dans l'eau, un agent dispersant pour compositions à base de ciment et un agent de solubilisation qui solubilise le démousseur insoluble dans l'eau.

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