Reinforced cement sheet product containing fibers other than asbestos, clay and thickener
AssigneeNational Gypsum Company
InventorsRobert M. Johnson, Elmer M. Melling
Life of this patent
Estimating the term…
Abstract
A fiber cement product consisting essentially by weight of a Portland cement binder in the amount of between about 40% and 80%, natural and/or synthetic fibers in an amount of between 1% and 15%, clay in an amount of between about 2% and 15%, and thickener in an amount of between about 0.03% and 0.5%. The product may also contain silica and/or filler in an amount of between about 10% and 40% by weight. The silica is generally used in a product which is to be autoclaved. The filler may be waste fiber-cement product or inert filler material.
Claims28
A fiber-cement product comprising by weight Portland cement in an amount of between about 40% and 80%, fibers other than asbestos in an amount of between about 1% and 15%, a thickener, and clay in an amount of between about 2% and 15% to coact with said thickener in an aqueous slurry containing said Portland cement and fibers to provide a sufficiently high drainage time for proper formation of a mat on a screen and a smaller solids loss than can be obtained by the use of said thickener by itself.
A fiber-cement product comprising by weight Portland cement in an amount of between about 40% and 80%, fibers in an amount of between about 1% and 15%, a thickener, and clay in an amount of between about 2% and 15% to coact with said thickener in an aqueous slurry containing said Portland cement and fibers to provide a lesser solids loss than can be obtained by the use of said thickener by itself.
A fiber-cement product comprising Portland cement in an amount of between about 40% and 80% by weight, fibers other than asbestos, and clay and thickener in relatively sufficient amounts to maintain said fibers in suspension in an aqueous slurry containing said fibers and Portland cement and to provide a lesser solids loss than can be obtained by the use of said thickener by itself.
Dependencies are inferred from the claim text.