Improving the freeze-thaw durability of dry cast...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 16/08 (2006.01) C04B 38/02 (2006.01)

Patent

CA 2570178

An improved freeze-thaw durability dry cast cementitious composition is provided that uses very small (0.1 gm to 100 ~m average diameter) polymeric microspheres that are blended directly into the mixture and optionally gas- generating additives. The polymeric microspheres provide void spaces in the material matrix that act to increase freeze-thaw durability of the material. In this dry cast cementitious composition, polymeric microspheres actas pre- formed voids.

L'invention concerne une composition améliorée à base de ciment moulée à sec et présentant une résistance accrue au gel et au dégel. Cette composition contient des microsphères polymères très faiblement dimensionnées (0,1 µm à 100 ?m de diamètre moyen) qui sont introduites directement dans le mélange, ainsi qu'éventuellement des additifs générateurs de gaz. Ces microsphères polymères créent des espaces vides dans la matrice de la composition, ce qui permet d'augmenter la résistance au gel et au dégel du matériau. Les microsphères polymères jouent un rôle de vides préconstitués dans cette composition moulée à sec à base de ciment.

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