Freeze-thaw durability of dry cast cementitious mixtures
AssigneeConstruction Research & Technology GmbH
InventorsLynn E. Brower, Thomas M. Vickers, Jr., Patrick Miller, Bruce J. Christensen
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Abstract
An improved freeze-thaw durability dry cast cementitious composition is provided that uses very small (0.1 μm to 100 μm 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 act as pre-formed voids.
Claims20
A cementitious freeze-thaw damage resistant dry cast composition comprising hydraulic cement, polymeric microspheres, and optionally gas generating additives.
A method for preparing a freeze-thaw damage resistant dry cast cementitious article comprising:
- a. mixing hydraulic cement, polymeric microspheres and optionally a gas generating additive to produce a cementitious composition mixture;
- and
- b. forming the mixture into an article.
Dependencies are inferred from the claim text.