Providing freezing and thawing resistance to cementitious...

Details Providing freezing and thawing resistance to cementitious... Providing freezing and thawing resistance to cementitious...

C - Chemistry, Metallurgy

04

B

C04B 16/08 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2570181

An improved freeze-thaw durability wet cast cementitious composition is provided that uses polymeric microspheres that are blended directly into the wet cast cementitious composition. The microspheres provide voids in the wet cast cementitious composition material matrix, and such voids acts to increase freeze-thaw durability of the cured and hardened cementitious material. The polymeric microspheres are filled with a liquid and are of average particle size 0.1 ~m to less than about 10 ~m. These polymeric particles are incorporated into the wet-cast cementitious composition in an unexpanded state, meaning the blowing agent is still present in form of a liquid.

L'invention concerne une composition à base de ciment à moulage humide à durabilité améliorée au gel-dégel qui utilise des microsphères qui sont mélangées directement dans la composition à base de ciment moulé et humide. Les microsphères génèrent des vides dans la matrice de matériau des compositions à base de ciment moulées humide et ces vides agissent de manière à augmenter la durabilité au gel-dégel du matériau à base de ciment séché et durci.

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