Rethink Your Life!
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The Work of Art and The Art of Work
Kiko Denzer on Art
mixing cob in sandy soilgoshawk at gnat.net goshawk at gnat.net
Mon Jul 7 01:14:41 PDT 1997
I came up with a way of making cob with my soil that seems to work fairly well. I think it's geared toward the sandy soil though. Basically I have this old electric cement mixer I picked up for $50. My soil has very little clay or organic matter in it. I must get clay from the local sand pit (Kaolin clay mainly) I put this in the cement mixer with water and let it run creating a clay slip that's a bit like thick chocolate milk. Once the slip is made I take the slip and add about 6 to 7 large coffee can's full into a wheel barrel full of sand. I mix this till the the moisture is about uniform and then add some straw, mixing again. The mixture is a bit drier than cob because using the super adobe bags you are working more like rammed earth. I have made some bricks with this (I had to add a bit more water to make the bricks) it seems to work good. Getting the slip mixed uniformly in the sand is easier (relatively speaking) than using a screen to break the clay up and mix it dry with with the sand. When I make cob to for building without bags, I will add a couple more cans of slip to increase the moisture content so it will be more workable. Pat Mauk Georgia "Any sufficiently advanced technology is indistinguishable from magic" Arther C Clark
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