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Pozzolan blends

  • US 5,223,035 A
  • Filed: 12/09/1991
  • Issued: 06/29/1993
  • Est. Priority Date: 08/29/1990
  • Status: Expired due to Term
First Claim
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1. A concrete article comprising a particulate pozzolanic blend of a mixture of fly ash particles of a Class C flyash having a sulphur content determined as wt. % SO3 of less than 5 wt. % and a blaine fineness of not more than about 5,000 cm2 /g, and an unground, fine pozzolan being the product of reaction between flue gases, generated by the burning of sub-bituminous coal, with an atomized slurry of slaked lime, said fine pozzolan having a sulphur content determined as wt. % SO3 of 5 to 25 wt. %, and a blaine fineness of 7,000 to 10,000 cm2 /g, said fine pozzolan containing about 65 to 75%, by weight of an amorphous component and 25 to 35%, by weight, of a crystalline component;

  • said blend comprising in weight %, 70 to 90% of said fly ash and 10 to 30% of said fine pozzolan;

    Portland cement particles; and

    aggregate;

    said Portland cement particles comprising 50 to 80%, by weight, based on the weight of said Portland cement and said pozzolanic blend, and said pozzolanic blend comprising 20 to 50%, by weight, based on the weight of said Portland cement and said pozzolanic blend;

    said article having a compressive strength of at least 1000 psi.

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