Method of controlling air entrainment in concrete compositions
AssigneeW. R. Grace & Co.-Conn.
InventorAhmad Arfaei
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Abstract
A method of controlling the level of entrained air in hydraulic cement compositions is disclosed comprising the sequential steps of preparing a hydraulic cement composition in the form of an aqueous slurry containing an air entraining plasticizer and a defoamer, and increasing the air content of the composition by adding to said composition an air entraining agent. This method prevents undesired air entrainment, while allowing controlled amounts of air to be entrained if desired for freeze/thaw durability.
Claims14
A method of preparing an air entrained cementitious composition comprising the sequential steps of:
- a. preparing an aqueous hydraulic cement-based slurry by admixing water, a hydraulic cement, an air entraining plasticizer, and a defoamer selected from the group consisting of acetylenic diols and reaction products thereof with alkylene oxides;
- and
- b. increasing the air content of the said composition by adding to said composition an effective air-entraining amount of an second air entraining agent.
A hydraulic cement composition in the form of an aqueous slurry comprising:
- a. a hydraulic cement binder;
- b. an air entraining plasticizer;
- c. a defoamer selected from the group consisting of acetylenic diols and reaction products thereof with alkylene oxides;
- and
- d. a second air entraining agent air.
Dependencies are inferred from the claim text.