Hey Wayne I think what you wish to do is something like what was done in a Mother Earth News article back in the 70's. Go to their web site and do a search for cement tipi and you should get something. There is also an article about a cement dome type building erected about that time too. From what I recall, they just used portland. But best read the article first. Best of luck. Victor @ The Stoneybog --- On Thu, 11/11/10, Wayne <huon@intas.net.au> wrote:
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