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US 5,180,430 AGranted
Concrete surface air void reduction admixture
AssigneeW.R. Grace & Co.-Conn.
InventorsEllis M. Gartner, Chiara F. Ferraris
Life of this patent
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Abstract
A method of reducing the surface voids and imperfections of molded cement structures by forming the cement composition with an admixture comprising a combination of Welan Gum and a water reducing agent.
Claims4
A process for inhibiting formation of surface voids of concrete structural unit comprising
- mixing a concrete composition composed of hydraulic cement, small aggregate, large aggregate and water with a combination of a cement water-reducing agent and Welan gum and, based on the hydraulic cement of said concrete composition, said water-reducing agent being present in from about 0.3 to 1 weight percent and said Welan Gum being present in from about 0.001 to 0.01 weight percent;
- casting said concrete composition into a mold capable of forming a shaped structure and having concrete-to-mold surface contact;
- curing said concrete composition while contained within the mold;
- and
- removing the mold to retrieve a cured shaped concrete structural unit which is substantially free of large surface voids on surfaces in contact with the mold during casting and curing.
2 more elements
Dependencies are inferred from the claim text.