Crystalline calcium carbonate as a diluent in hydrothermally cured hydraulic cement compositions
AssigneeManville Service Corporation
InventorThomas H. Sadler
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Abstract
The present invention relates to hydrothermally cured articles of manufacture and the processes for making the same. In the past, calcium carbonate has been included in such articles and processes a number inert filler materials to alter physical characteristics, appearance, etc. The present invention comprises incorporating crystalline calcium carbonate, preferably in the form of powdered marble, with the normal constituents to dilute the relative amounts of these constituents and thus make a more economic blend without substantial degradation to the physical characteristics of the article of manufacture incorporating such crystalline calcium carbonate.
Claims10
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.
In a process for making a hydrothermally cured article of manufacture including the steps of combining a hydraulic cement, ground quartz, inorganic reinforcing fiber and calcium carbonate and hydrothermally curing the combined ingredients, the improvement comprising selecting from the family of calcium carbonates a powdered calcium carbonate having a well-defined, highly compacted, structurally sound crystalline structure and having at most a minor amount of amorphous carbonates and wherein the average equivalent spherical diameter of the particles of said selected calcium carbonate is between about 10 and 50 microns.
Dependencies are inferred from the claim text.