Cementitious gypsum-containing compositions and materials made therefrom
AssigneeNational Gypsum Company
InventorsElisha Stav, Edward A. Burkard, Ronald S. Finkelstein
Life of this patent
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Abstract
A cementitious composition useful for water-resistant construction materials, including floor underlayments, backing boards, self-leveling floor materials, road patching materials, fiberboard, fire-proofing sprays, and fire-stopping materials includes about 20 wt. % to about 75 wt. % calcium sulfate beta-hemihydrate, about 10 wt. % to about 50 wt. % Portland cement, about 4 wt. % to about 20 wt. % silica fume and about 1 wt. % to about 50 wt. % pozzolanic aggregate. The Portland cement component may also be a blend of Portland cement with fly ash and/or ground blast slag.
Claims24
A cementitious composition consisting essentially of:
- (a) about 20 wt. % to about 75 wt. % calcium sulfate beta-hemihydrate;
- (b) about 10 wt. % to about 50 wt. % of a cement selected from the group consisting of Portland cement, a blend of Portland cement and fly ash, a blend of Portland cement and ground blast slag;
- and mixtures thereof;
- (c) about 4 wt. % to about 20 wt. % silica fume;
- and
- (d) about 1 wt. % to about 50 wt. % pozzolanic aggregate.
A water resistant construction material prepared by combining a cementitious composition with a slight stoichiometric excess of water, said cementitious composition consisting essentially of:
- (a) about 20 wt. % to about 75 wt. % calcium sulfate beta-hemihydrate;
- (b) about 10 wt. % to about 50 wt. % of a cement selected from the group consisting of Portland cement, a blend of Portland cement and fly ash, a blend of Portland cement and ground blast slag;
- and mixtures thereof;
- (c) about 4 wt. % to about 20 wt. % silica fume;
- and
- (d) about 1 wt. % to about 50 wt. % pozzolanic aggregate.
A water resistant construction material having a thickness of about 1/8 inch, said material prepared by combining a cementitious composition with a slight stoichiometric excess of water, said cementitious composition consisting essentially of:
- (a) about 20 wt. % to about 75 wt. % calcium sulfate beta-hemihydrate;
- (b) about 10 wt. % to about 50 wt. % of a cement selected from the group consisting of Portland cement, a blend of Portland cement and fly ash, a blend of Portland cement and ground blast slag;
- and mixtures thereof;
- (c) about 4 wt. % to about 20 wt. % silica fume;
- and
- (d) about 1 wt. % to about 50 wt. % pozzolanic aggregate.
A cementitious composition consisting essentially of:
- (a) about 30 wt. % to about 75 wt. % calcium sulfate beta-hemihydrate;
- (b) about 10 wt. % to about 40 wt. % Portland cement;
- (c) about 5 wt. % to about 20 wt. % silica fume;
- and
- (d) about 10 wt. % to about 40 wt. % pozzolanic aggregate.
A cementitious composition consisting essentially of:
- (a) about 30 wt. % to about 75 wt. % calcium sulfate beta-hemihydrate;
- (b) about 10 wt. % to about 40 wt. % Portland cement;
- (c) about 4 wt. % to about 20 wt. % silica fume;
- and
- (d) about 1 wt. % to about 40 wt. % pozzolanic aggregate.
Dependencies are inferred from the claim text.