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Crystalline calcium carbonate as a diluent in hydrothermally cured hydraulic cement compositions

  • US 4,326,891 A
  • Filed: 05/21/1980
  • Issued: 04/27/1982
  • Est. Priority Date: 05/21/1980
  • Status: Expired due to Term
First Claim
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1. In a hydrothermally cured article of manufacture comprising a blend of calcium carbonate, inorganic reinforcing fiber, hydraulic cement and ground quartz, the improvement comprising said calcium carbonate being a powdered crystalline calcium carbonate having a well-defined, highly compacted, structurally sound, crystalline structure and having at most a minor amount of carbonates with an amorphous structure and wherein the average equivalent spherical diameter of the particles of the crystalline calcium carbonate is between about 10 and 50 microns.

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