Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1997-06-13
1999-05-11
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
264 71, 264333, 264338, 264DIG7, 249144, 425412, 425421, B28B3/00
Patent
active
059025280
ABSTRACT:
A method of making an article from a lightweight cementitious composition includes molding a castable cementitious mixture including an aqueous slurry of at least perlite and concrete into an article, such as a hollow, decorative article. The castable cementitious mixture can include a fibrous material, for reinforcing the cement and perlite, and an air entraining agent, for facilitating mixability and reducing a density of the cementitious mixture and facilitating casting. The mold can include an external mold form that contains the cementitious mixture and an internal mold form that displaces the cementitious mixture within the external mold form to cast the hollow article in various shapes and with various surface textures. The external and internal mold forms include liners made of a lightweight flexible material that can be removed, unfolded, and prepared and/or cleaned.
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