Rethink Your Life!
Finance, health, lifestyle, environment, philosophy
The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] Cob: Paper clayRaduazo at aol.com Raduazo at aol.com
Sun May 22 11:45:07 PDT 2005
In a message dated 5/21/2005 8:38:37 PM Eastern Standard Time, ap615 at hotmail.com writes: The person who developed the stuff being sold does have a patent. That may, mostly, cover the process by which she made it not turn sour in the vat and make it salable. There's been an awful lot of paper-whatever (padobe, for one) or even whatever-crete, not all of which has con-crete in it, IIRC. The patent relates to a composition suitable for firing, and if you made roofing tiles with paper cob and fired them you would be infringing the patent. The stuff that I make is not suitable for firing. I do not go to great length to break up the paper into individual fibers. I do not go to great lengths to remove all clumps of paper from the mix, and my waterproofing is done by applying boiled linseed oil and then possibly urethane if you want a real hard nonporous finish. (Possibly not a good idea for a wall that must breath.) I think that I use a lot more paper than the patent. I have a picture of my batching plant with all the material that went into one batch. The batches seem to bond well when boning wet plaster to dry cob or to dry plaster. The children's playhouse at Green Spring Gardens Park has had about 80 inches of rain with no roof. The paper plaster appears to be out performing lime plaster. I have not done any research on the optimal mixes. If there is anyone who wants to do another science fair project this would be a good one to try. By the way: In the earth floor science fair project Abby found that boiled linseed oil out performed all other materials tested under impact. Probably because it penetrated deeper into the earth floor material. (She tested impact resistance by dropping the head of a ball-peen hammer 5 1/2 feet through a plastic tube on the test surfaces.) More sand was better for impact resistance and there was no measurable difference between paper and shredded straw as the reinforcing material. All paper (no sand in mix) tended to get moldy. All straw (also no sand) did not. There was no structural reason to put lots of paper in a floor as small amounts of fiber and lots of sand seemed to give the best results. Ed
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