Patent ID: 8394191

Claim:
A low slump cementitious composition comprising: hydraulic cement; water; and a rheology modifying additive comprising: (i) an additive (A) that undergoes shear thinning in low slump cementitious compositions in response to the application of energy to said low slump cementitious composition, and recovering viscosity in the absence of an application of energy to said low slump cementitious composition, and (ii) an additive (B) that does not undergo shear thinning when used alone in a low slump cementitious composition in response to the application of energy to said low slump cementitious composition, but when used in combination with additive (A), synergistically acts with additive (A) to further reduce the yield stress of said low slump cementitious composition to which additives (A) and (B) are added, thereby improving the volume flow of said low slump cementitious composition under shear conditions, wherein the low slump cementitious composition has a slump of less than 3 inches, wherein said additive (A) is present in amount from about 0.0005 percent to about 0.025 percent by weight of cementitious content, and wherein said additive (B) is present in an amount from about 0.001 percent to about 0.05 percent by weight of cementitious content.