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US 2013/0281577 A1Published application
Stabilized Defoamers For Cementitious Compositions
AssigneeW. R. Grace & Co.-Conn.
InventorsYing CHEN, Lawrence L. KUO, Ara A. JEKNAVORIAN
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Abstract
The present invention discloses additive compositions, cementitious compositions, and methods for controlling air in cementitious compositions in which colloidal nano-particles are used for stabilizing a water-dispersible defoamer within a cement-dispersant-containing aqueous additive formulation for modifying hydratable cementitious compositions such as cement or concrete.
Claims18
An stable additive composition for modifying cementitious compositions, comprising:
- a) at least one water-dispersible defoamer comprising polyalkylene oxide;
- b) at least one polycarboxylate cement dispersant having polyethylene oxide groups, polypropylene oxide groups, or mixture thereof;
- and
- c) colloidal nano-particles having a Z-average size of 8-150 nanometers and being selected from the group consisting of silica, alumina, zinc oxide, tin oxide, cerium oxide, zirconia, and mixtures thereof.
1 more element
Dependencies are inferred from the claim text.