hpmer
Full Member
Posts: 240
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Post by hpmer on Feb 23, 2010 8:54:24 GMT -8
Is it reasonable to think I can cast the burn tunnel from clay and vermiculite or, given the temps reached, should it remain fire brick and just use the castable for the heat riser?
Also, I know it's been said that sand does not belong in the mix, but is the clay a sufficent binder or do I need to use a cement based product?
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Post by Donkey on Feb 24, 2010 15:31:38 GMT -8
Depends on your clay.
If it's good stuff, I'd say cast it and go. I've done a bit of play on this subject.. With my clays, it just isn't a problem.
Basic cement can't handle the heat and will fail. You gotta use the special stuff if you really need to go there at all.
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hpmer
Full Member
Posts: 240
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Post by hpmer on Feb 24, 2010 16:05:47 GMT -8
OK, I guess I'll try it and see.
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Teach
Junior Member
Posts: 89
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Post by Teach on Feb 25, 2010 13:05:51 GMT -8
Along this same line, if I wanted to fire my clay that I recently found to find out how it would harden and toughen up for such a use or perhaps to make bricks first etc. How long would the dry clay have to be fired to get a good indication as to how it would survive and function in such an application?
Also, can the fire itself within the rocket serve to fire the clay? Or should it be fired first?
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Post by Donkey on Mar 6, 2010 11:59:14 GMT -8
I've built all adobe rocket stoves, so far they've worked just fine.
I took 'em apart for inspection after a good, hot firing. The adobes were fired about 1/4 to 1/2 inch deep where they were in the hottest part of the fire.
I could be wrong, but my feeling is that you don't need to fire 'em first. You just need to play with the mix a bit to find the right combination that won't crack apart under heat stress, etc.
As to firing time, I really couldn't tell ya.. It's gonna be one of those "it all depends" kind of answers.
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