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Method of controlling air entrainment in concrete compositions

  • US 4,948,429 A
  • Filed: 06/14/1989
  • Issued: 08/14/1990
  • Est. Priority Date: 06/14/1989
  • Status: Expired due to Fees
First Claim
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1. 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.

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