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Post by peterberg on Sept 14, 2017 13:01:02 GMT -8
A special product do exist to reinforce refractory concrete: stainless steel needles. And there are brands of refrac concrete that contains little polypropyleen fibres which will melt away and leave small voids which in turn act as a reinforcement structure. Very similar as the straw in structural cob, by the way.
Many years ago I tried something you talk about: in my case it led to utterly disappointment and based on that I would recommend against it.
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Post by Vortex on Sept 14, 2017 15:09:59 GMT -8
What if you use castable refractory reinforced with regular iron rods (wires), I know the problem of different temperature expansion but I guess that if using 3 or 4 mm wires this should not be critical - Do you agree?. Or to be on a safe side you can cover 10 mm rods with some material (maybe regular paper or pvc foil) to allow expansion this should also add some strength to castable. Or simply fist of 1mm wire cut at 3cm length or better some metal clips mixed in concrete. Would any of this be a good idea? I've found the very fine lightest grade of chicken wire works very well but anything larger causes cracking.
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Post by ronyon on Sept 17, 2017 12:04:06 GMT -8
I've been adding rock wool to high tempature cement. The rock wool is cheap, and refractory to high tempatures. It's has been noted here that it won't survive on its own when exposed to the flame path, thus it needs to go inside refractory cement or cob, etc.
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