Louis Katz on fri 22 aug 03
Even "dry" concrete has water chemically combined with it. You still
need to fire slow. I don't know when concrete dehydrates but suspect
that it happens in stages rather than at a single temperature. I would
not fire concrete if you c ant afford some damage to your kiln.
Louis
David Hendley on fri 22 aug 03
These questions are related, at least in my mind. I think that both
rocks and concrete will crumble if fired to pottery temperatures.
Concrete, after all, includes a large percentage of rock as aggregate.
The cement part of concrete is lime (calcium).
So, I would not try to glaze rocks because they will just break.
But, to make a concrete glaze I would fire a chunk of concrete and
then ball mill the resulting rubble to 100-200 mesh.
You could do tests to formulate a concrete glaze, but it would be
most expedient to simply add a small percentage of the concrete
powder to an existing glaze.
As someone mentioned about firing rocks, be sure the concrete is
totally dry and fire slowly, to prevent an explosion.
Everything I've said is just my best guess. I have no experience doing
any of this. Try it at your own risk!
David Hendley
david@farmpots.com
http://www.farmpots.com
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