EXPANSIVE CEMENT
First Claim
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1. A composition comprising the following components:
- a calcium aluminate cement in an amount from about 5% to about 50% by weight of the composition;
a lithium compound in an amount from about 0.01% to about 5.00% by weight of the composition;
calcium hydroxide present in an amount from about 1% to about 20% by weight of the composition;
sodium bicarbonate present in an amount from about 0.1% to about 5.0% by weight of the composition; and
gypsum present in an amount from about 50% to about 80% by weight of the composition; and
wherein the components of the composition are configured such that when the composition is added to a Portland cement and water to produce a cement composition there results at least a 10% expansion within 1 day after the onset of curing of the cement composition.
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Abstract
An expansive additive composition for use in Portland cements and a method of using such an additive composition is provided. The additive composition can include a calcium aluminate cement additive and a lithium compound. The additive composition is capable of producing expansion in set cements when the temperature is at or below room temperature and minimizes the amount of calcium aluminate cement additive needed.
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Citations
19 Claims
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1. A composition comprising the following components:
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a calcium aluminate cement in an amount from about 5% to about 50% by weight of the composition; a lithium compound in an amount from about 0.01% to about 5.00% by weight of the composition; calcium hydroxide present in an amount from about 1% to about 20% by weight of the composition; sodium bicarbonate present in an amount from about 0.1% to about 5.0% by weight of the composition; and gypsum present in an amount from about 50% to about 80% by weight of the composition; and wherein the components of the composition are configured such that when the composition is added to a Portland cement and water to produce a cement composition there results at least a 10% expansion within 1 day after the onset of curing of the cement composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A composition consisting essentially of the following components:
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a calcium aluminate cement in an amount from about 5% to about 50% by weight of the composition; a lithium compound in an amount from about 0.01% to about 5.00% by weight of the composition; calcium hydroxide present in an amount from about 1% to about 20% by weight of the composition; sodium bicarbonate present in an amount from about 0.1% to about 5.0% by weight of the composition; and gypsum present in an amount from about 50% to about 80% by weight of the composition; and wherein the components of the composition are configured such that when the composition is added to a Portland cement and water to produce a cement composition there results at least a 10% expansion within 1 day after the onset of curing of the cement composition. - View Dependent Claims (16, 17, 18, 19)
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Specification