초록

Foamed cement compositions comprising carbon fibers, a hydraulic cement material, sufficient water to form a slurry, an expanding additive, and optionally, other ingredients, including any suitable additives.

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What is claimed is: 1. A cement composition consisting essentially of: one or more hydraulic cements; carbon fibers, the carbon fibers having a mean length of about 500 microns or less; water present in an amount sufficient to form a cement slurry; one or more retardants; and one or more expanding

What is claimed is: 1. A cement composition consisting essentially of: one or more hydraulic cements; carbon fibers, the carbon fibers having a mean length of about 500 microns or less; water present in an amount sufficient to form a cement slurry; one or more retardants; and one or more expanding additives selected from the group consisting of: one or more gases, aluminum, gypsum, and magnesium oxide. 2. The cement composition of claim 1 wherein the one or more comprise at least one gas selected from the group consisting of: nitrogen, and mixtures thereof. 3. The cement composition of claim 1 wherein the expanding present in an amount in the range of from about 0.01% to about 60% by volume of the cement composition. 4. The cement composition of claim 1 wherein the carbon fibers are present in an amount of from about 1% to about 15% by weight of the cement in the cement composition. 5. The cement composition of claim 1 wherein the one or more hydraulic cements comprise at least one cement selected from the group consisting of: Portland cements, pozzolana cements, gypsum cements, high alumina content cements, silica cements, high alkalinity cements, and calcium phosphate cements. 6. The cement composition of claim 1 wherein the expanding additive comprises a powder. 7. The cement composition of claim 6 wherein the hydraulic cement comprises a cement having a pH greater than about 12. 8. The cement composition of claim 1 wherein at least a portion of the carbon fibers have a mean length of about 100 to about 200 microns. 9. The cement composition of claim 1 wherein the cement composition has a tensile strength greater than about 115 psi. 10. The cement composition of claim 6 wherein the cement composition has a tensile strength greater than about 258 psi. 11. The cement composition of claim 1 wherein the water is present in an amount in the range of from about 25% to about 100% by weight of cement. 12. The cement composition of claim 1 wherein the water is present in an amount in the range of from about 30% to about 50% by weight of cement. 13. A cement composition cosisting essentially of: one or more hydraulic cements; carbon fibers wherein at least a portion of the carbon fibers have a mean length less than about 1 mm; water present in an amount sufficient to form a cement slurry; one or more retardants; and one or more expanding additives present in an amount sufficient to foam the cement composition. 14. The cement composition of claim 13 wherein the expanding additive is a powder and wherein the hydraulic cement comprises a cement having a pH greater than about 12. 15. The cement composition of claim 13 wherein at least a portion of the carbon fibers have a mean length of about 100 to about 200 microns. 16. A cement composition consisting essentially of: one or more hydraulic cements; carbon fibers, the carbon fibers having a mean length of about 500 microns or less; water present in an amount sufficient to form a cement slurry; one or more retardants; and one or more expanding additives present in an amount sufficient to foam the cement composition. 17. The cement composition of claim 16 wherein the expanding additive comprises a powder and wherein the hydraulic cement comprises a cement having a pH greater than about 12. 18. The cement composition of claim 16 wherein at least a portion of the carbon fibers have a mean length of about 100 to about 200 microns. 19. The cement composition of claim 16 wherein the carbon fibers are present in an amount of from about 1% to about 15% by weight of the cement in the cement composition.