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Post by pyrolyse on Mar 23, 2017 15:55:54 GMT -8
Can concrete bricks/slabs be used for the outer shell of a heater (i.e not in contact with fire)? Will it withstand the frequent heating and cooling cycles in a stove? The reason I ask is because this material can be picked a lot of places for free in my country. The 'bricks' i'm refering to look like this: wals.dk/images/a-supply_billeder/314214gf-p.jpg |
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Post by peterberg on Mar 24, 2017 1:13:20 GMT -8
Yes, it has been done before, there are some restrictions though. No steel rebar or something like that, and when used as first bell with a batchrocket core everything above the riser end should be lined with firebrick or equivalent. Could be split bricks, larger plates or whatever. Maximum allowable temperature for portland cement products is around 400º C. Oh, and use soft mortar like lime/portland/sand or even clay/sand in order to allow flexibility.
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Post by pyrolyse on Mar 25, 2017 5:37:45 GMT -8
Thanks for the quick answer, Peter.  |
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Post by patamos on Mar 26, 2017 13:31:08 GMT -8
Thanks Peter, I've been wondering what the ceiling temp is.
Also recalling Karl's post about portland cemented concrete wanting to spall once the temperature is rising more than 5c in 1 minute.
Maybe the moisture it has soaked up just can't get out quick enough. But not sure about that one...
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