Method for forming a lightweight cementitious structural...

Details Method for forming a lightweight cementitious structural... Method for forming a lightweight cementitious structural...

C - Chemistry, Metallurgy

04

B

261/48

C04B 38/10 (2006.01) C04B 24/26 (2006.01) C04B 28/14 (2006.01)

Patent

CA 1211480

METHOD FOR FORMING A LIGHTWEIGHT CEMENTITIOUS STRUCTURAL PRODUCT AND PRODUCT FORMED THEREBY ABSTRACT OF THE DISCLOSURE A method for producing a lightweight set cementitious products and more specifically, gypsum wallboard, having excellent strength and paper- to-core bond, which method comprises producing a foam comprising polyvinyl alcohol and water, introducing the foam thus formed into an aqueous cementitious slurry, depositing the slurry between paper cover sheets, and permitting the cementitious slurry to set. In a further embodiment an emulsion formed of asphalt and wax is added to the cementitious slurry to impart water resistance, the polyvinyl alcohol of the foaming agent cooperating with the asphalt and wax emulsion to improve the water resist- tant properties of the set gypsum wallboard.

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