Lightweight cellular cement compositions and methods of casting the same

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.