Rheology modifying additive for cementitious compositions
AssigneeConstruction Research & Technology GmbH
InventorJeffrey R. Bury
Life of this patent
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Abstract
A cementitious composition including cement, water, and a rheology modifying additive (RMA) is provided. The inclusion of the RMA improves the cementitiuous composition's response to vibration, and dampens out differences due to minor fluctuations in initial slump of the composition. The RMA may include a dispersant for cementitiuous compositions. The cementitious composition may optionally include other admixtures or additives known in the industry. A method for making the cementitious composition is also provided.
Claims52
A rheology modifying admixture for a cementitious composition comprising:
- an additive (A) capable of undergoing shear thinning in cementitious compositions in response to the application of energy to said cementitious composition and recovering viscosity in the absence of an application of energy to said cementitious system;
- and
- an additive (B) that does not undergo shear thinning when used alone in a cementitious composition in response to the application of energy to said cementitious composition, but when used in combination with additive (A), synergistically acts with additive (A) to further reduce the yield stress of said cementitious composition to which additives (A) and (B) are added, thereby improving the volume flow of said cementitious composition under shear conditions.
A cementitious composition comprising:
- hydraulic cement;
- water;
- and
- a rheology modifying additive comprising:
- (i) an additive (A) capable of undergoing shear thinning in cementitiuous compositions in response to the application of energy to said cementitiuous composition, and recovering viscosity in the absence of an application of energy to said cementitiuous system, and
- (ii) an additive (B) that does not undergo shear thinning when used alone in a cementitiuous composition in response to the application of energy to said cementitiuous composition, but when used in combination with additive (A), synergistically acts with additive (A) to further reduce the yield stress of said cementitiuous composition to which additives (A) and (B) are added, thereby improving the volume now of said cementitiuous composition under shear conditions.
A method of making a cementitious composition comprising mixing together hydraulic cement, water, and a rheology modifying additive for said cementitiuous composition, wherein said rheology modifying additive comprises (i) an additive (A) capable of undergoing shear thinning in cementitiuous compositions in response to the application of energy to said cementitiuous composition, and recovering viscosity in the absence of an application of energy to said cementitiuous system, and (ii) an additive (B) that does not undergo shear thinning when used alone in a cementitiuous composition in response to the application of energy to said cementitiuous composition, but when used in combination with additive (A), synergistically acts with additive (A) to further reduce the yield stress of said cementitiuous composition to which additives (A) and (B) are added, thereby improving the volume flow of said cementitiuous composition under shear conditions.
Dependencies are inferred from the claim text.