Gypsum-based floor underlayment
AssigneeGeorgia-Pacific Gypsum LLC
InventorHubert C. Francis
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Abstract
A flooring composition for mixing with water to produce a self-leveling slurry that quickly hydrates to form a high strength floor underlayment comprising a dry mixture of (1) beta gypsum produced by a continuous method; (2) Class C fly ash; (3) a conventional water reducing aid such as sulfonated melamines, sulfonated naphthalenes and their related formaldehyde condensates, and (4) a conventional set retarder.
Claims8
A dry blend of ingredients to be mixed with water to form a self-leveling slurry that hydrates to form a high strength flooring comprising:
- (1) about 50 to 90% by weight of continuous beta gypsum;
- (2) about 10 to 40% by weight of Class C fly ash
- (3) about 0.01 to 10% by weight of a dispersing agent selected from the group consisting of sulfonated melamines, sulfonated naphthalenes, naphthalene sulfonate-formaldehyde condensates;
- melamine sulfonate-formaldehyde condensates and mixtures thereof, and
- (4) about 0.02 to 1% by weight of a set retarder.
A dry blend of ingredients to be mixed with water to form a self-leveling slurry that hydrates to form a high strength flooring, consisting essentially of:
- (1) about 50 to 90% by weight of continuous beta gypsum;
- (2) about 10 to 40% by weight of Class C fly ash
- (3) about 0.01 to 10% by weight of a dispersing agent selected from the group consisting of sulfonated melamines, sulfonated naphthalenes, naphthalene sulfonate-formaldehyde condensates;
- melamine sulfonate-formaldehyde condensates and mixtures thereof, and
- (4) about 0.02 to 1% by weight of a set retarder.
Dependencies are inferred from the claim text.