Construction Research & Technology Gmbh

Bruce J Christensen

Thomas M Vickers, Jr

Jeffrey R Bury

Michael Lester Kerns

Lynn E Brower

Patrick Miller

A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant, a set retarder, and a strength improvement additive.

Strength improvement admixture

A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant and strength improvement additive.

Amine containing strength improvement admixture

An improved freeze-thaw durability dry cast cementitious composition is provided that uses very small (0.1 &#x3bc;m to 100 &#x3bc;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 act as pre-formed voids.

Freeze-thaw durability of dry cast cementitious mixtures

An improved freeze-thaw durability cementitious composition is provided that uses at least partially degradable polymeric particles that are blended directly into the cementitious composition mixture. The degradable polymeric particles provide void spaces in the cementitious material matrix, and such void spaces act to increase freeze-thaw durability of the cementitious material.

Providing freezing and thawing resistance to cementitious compositions

An improved freeze-thaw durability wet cast cementitious composition is provided that uses in-situ production of gas by gas generating additives and optionally polymeric microspheres that are blended directly into the mixture. The gas generating additives and the polymeric microspheres provide void spaces in the material matrix, and such void spaces act to increase freeze-thaw durability of the material.

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Solon, OH, United States of America

Bruce J Christensen