Lightweight cellular cement compositions and methods of casting the same
First Claim
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1. A method of producing an integral lightweight high strength cement composition having at least one high strength densified layer adjacent at least on lightweight cellular layer comprising mixing hydraulic cement;
- water added in an amount of about 23-80% by weight of said dry cement;
a foam stabilizer added in an amount 0.25-5% by weight of dry cement selected from organic surfactants, inorganic lamellar particulate and mixtures thereof;
a dispersing agent selected and added to facilitate formation of a high strength densified layer prior to setting of said composition; and
air added in an amount sufficient to reduce density to less than about 80 pounds per cubic foot;
forming said cement composition into the desired shape;
positioning an air and water permeable material adjacent the cement composition;
promoting and controlling formation of said high strength densified layer by establishing a pressure differential across said permeable material causing air and water to flow from the layer to be densified and allowing said composition to set.
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Abstract
The present invention relates to novel lightweight cellular cement compositions, methods of preparing such compositions and methods of casting the compositions into lightweight high strength structural members.
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2 Claims
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1. A method of producing an integral lightweight high strength cement composition having at least one high strength densified layer adjacent at least on lightweight cellular layer comprising mixing hydraulic cement;
- water added in an amount of about 23-80% by weight of said dry cement;
a foam stabilizer added in an amount 0.25-5% by weight of dry cement selected from organic surfactants, inorganic lamellar particulate and mixtures thereof;
a dispersing agent selected and added to facilitate formation of a high strength densified layer prior to setting of said composition; and
air added in an amount sufficient to reduce density to less than about 80 pounds per cubic foot;
forming said cement composition into the desired shape;
positioning an air and water permeable material adjacent the cement composition;
promoting and controlling formation of said high strength densified layer by establishing a pressure differential across said permeable material causing air and water to flow from the layer to be densified and allowing said composition to set. - View Dependent Claims (2)
- water added in an amount of about 23-80% by weight of said dry cement;
Specification