I've done 4' x 8' panels with the same simple portland and paper mix.
While I was experimenting with boric acid, clay, sand, joint compound,
and other materials in mixes I saw no additional value. I used to use
significantly less Portland, but I was not happy with the flammability,
strength, dry time, warped shapes, and shrinkage.
On Wed, Jul 04, 2007 at 12:25:46AM -0000, Ernie Phelps wrote:
> Do most folks add sand or other agregates? I don't either, although
> my mix is alot lighter on the portland than Mike's. So far it is
> serving my purpose, although if I was building big walls I might add
> some sand.
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