Rethink Your Life!
Finance, health, lifestyle, environment, philosophy
The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] topsoilHenry Raduazo raduazo at cox.net
Sun Jan 17 06:21:01 PST 2010
Making bricks is the best test of a potential cob material. I mix sand with the base material and try to find the ideal material and then try to get it approximately right not precisely wrong. The first time I did this I mixed 0, 1, 2, 3, and 4 parts of sand with one part soil. Every one of my blocks was suitable for building, I thought 2 parts sand and one part clay soil was the best, but I tried for a 1 to 1 mix because clay was free and rock dust cost $22.00 per ton and had to be transported one pickup truck load at a time. In the end a 10 foot high wall shrank about 3 inches top to bottom. The double pane glass that I embedded in the wall with 2 inches of foam padding survived, but the outer pane cracked so I now have a 45 x 32 inch single pane of glass imbedded in an 8 ton cob wall. Dry cob is unaffected by freezing, but if water is allowed to soak deeply into the wall and freeze it will damage the wall. Normally the dry cob with a roof over it sheds water and wicks it away from the surface so quickly that by the time serious freezing occurs the wall is unaffected. Cob walls have thermal inertia too so that if you have hard rains followed by cold freeze the cob walls will resist deep freezing long enough to prevent damage. I have several walls in the Washington, DC area with no roof. We have lots of rain followed by freezing and as you would expect the walls are deteriorating over time. Other walls that occasionally get wet are undamaged. Ed On Jan 16, 2010, at 11:06 PM, Janet Standeford wrote: > How far down should you go to get beneath topsoil in a vegetation rich > environment? I went down 6-8 inches and found soil in a tiny valley > that > had some miniature root stragglers and since it was already wet I > squeezed some together and found it to be nearly pure clay. It is > sticky so I had to scrape it off the shovel and when pressed, it held > together until it was down to about 1/8 of an inch then it started to > fall apart.. > > Thought I'd run this by you guys before I use it for my samples as I > have limited time to get these tested so can't spend a lot of time > playing with it. > > By the way, does clay not freeze? The first 4-6 inches of dirt was > frozen then it became very easy to shovel out. > > Hoping to make some initial sample blocks this weekend but need to > know > where to find a small amount of hydrated lime and a small amount of > portland cement. > > Any ideas? I am really grateful to have the support of such a great > group of people. Some of the individual emails make me feel like > extended family. Thank you. > > > _______________________________________________ > Coblist mailing list > Coblist at deatech.com > http://www.deatech.com/mailman/listinfo/coblist
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