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Post by Donkey on Jun 7, 2010 13:01:12 GMT -8
So, as an experiment I built a basic rocket elbow out of adobe. The frame.  Drying bricks  Two kinds of adobe: one regular old adobe mix and one that's rice hull/clay. I wanted to try out the rice/hull clay thing as insulator.  The test bed  The stove. I didn't have very many rice hull bricks, so I put 'em at the bottom of the heat riser, the hottest place.  Burnin, nice an clean.  Post mortem, look'in down the riser, at the rice hull bricks.  Broken rice hull brick.. Just lookin.  |
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hpmer
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Post by hpmer on Jun 7, 2010 13:08:09 GMT -8
Did they harden brick-like with the heat??
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Post by Donkey on Jun 7, 2010 16:26:16 GMT -8
Did they harden brick-like with the heat?? Yep, on one side.The regular adobe ones did. With the rice hull/clay ones, the clay fired and the hulls cooked out leaving voids, char and fine ash. They stayed quite fragile, though (as I've said before) I don't think that's a problem as where they go best there will be little physical shock, that is banging around. |
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Post by netcarver on Jun 19, 2011 6:58:17 GMT -8
Hmmm,
as a newbie to stove making (and this forum), living in an area lacking readily available rice hulls, I wonder if I could use puffed rice as an alternative to the hulls?
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hpmer
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Post by hpmer on Jun 19, 2011 7:22:09 GMT -8
Donkey has also suggested wood ash in the past which I've used with success.
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Post by netcarver on Jun 19, 2011 14:52:39 GMT -8
Thanks for the reply hpmer.
I found the thread you were talking about. In it you mentioned you were going to finish off your heat riser with the ash/clay bricks. Can I ask how durable the combination turned out for you?
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hpmer
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Post by hpmer on Jun 19, 2011 15:50:01 GMT -8
Worked quite well, though I didn't use bricks but rather used forms to create the shape. The outer part is made from metal duct, and the inner from wood floor underlayment which burned away on first firing. The ash/clay mix in between did harden with the heat in brick-like fashion.
Since the outer shell is duct, I really can't tell if it fired all the all the way through, but I'm happy with the results.
I made test pucks first and they are quite light yet not crumbly at all. That might be the best suggestion...make some test pucks with different ratios, fire them and compare.
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