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Post by martyn on Nov 6, 2018 5:35:21 GMT -8
I was wondering what is the recommended material for bonding fire bricks when constructing a brick bell?
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Post by wiscojames on Nov 6, 2018 10:00:19 GMT -8
Clay/sand mortar works really well. (assuming you've filtered out the large bits)
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Post by martyn on Nov 6, 2018 23:48:07 GMT -8
Ok thank you, although I did not realise clay and sand would actually stick to the brick once it is heated and dried out?
In the wood oven or pizza oven world we use something called “home brew” this is a mix of sand, clay, portland cement and lime. The mx is 3 1 1 1 and it works extreamly well for that use.
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Post by pinhead on Nov 30, 2018 6:20:05 GMT -8
Ok thank you, although I did not realise clay and sand would actually stick to the brick once it is heated and dried out? In the wood oven or pizza oven world we use something called “home brew” this is a mix of sand, clay, portland cement and lime. The mx is 3 1 1 1 and it works extreamly well for that use. You'd be amazed as to how well clay/sand sticks to bricks - without the cement. I add ash to mine to make it even more sticky (and more heat tolerant). |
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Post by yohedge on Jan 16, 2019 1:49:37 GMT -8
You'd be amazed as to how well clay/sand sticks to bricks - without the cement. I add ash to mine to make it even more sticky (and more heat tolerant). Hi !
So a clay-sand mix could be used for permanent building ? I thought it was for test builds !
I built one mockup that work well (post coming) but he is showing crack. I used clay sand to be able to modify my prototype easily, and I did a lot !
I love the ability of removing bricks, scratch the dry clay sand mix, add water and use it again !!
Maybe my mortar layers are too thin, and assemble / disassemble moved the bricks.
So coool, I 'll re-build it with clay/sand mix again with thicker layers this time  and maybe I'll add ashes too.
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Post by BenAlexanderT on Jan 19, 2019 9:53:05 GMT -8
I've built this whole contraption with only clay/sand mix. So far I have no problem and I also built a test masonry heater before I make my main one and I pushed the wall more than enough to make sure that it holds. And you have the added benefit that you can tear it down without damaging the bricks if you like it too  Link with the build: photos.app.goo.gl/Ykx6sqWMHAHkYnb87 |
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Post by stephenson1 on Apr 5, 2019 17:21:53 GMT -8
Hi Ben. Your heater looks great! I'm curious about the long term durability of clay/sand mortar. How long have you been burning your device regularly? Also, what's your ratio for the mix?
Best,
Mark
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Post by BenAlexanderT on Apr 10, 2019 12:50:14 GMT -8
I used it from January to March and it holds really well. I actually test it regularly by putting my weight(110 kg, ~240 pounds) on it and it doesn't budge at all. I don't see it budging any time soon. You will need a lot more than my weight to make it budge. Concerning the mixture, I just used my backyard soil which is high in clay concentration and then I added some extra sand. I don't remember ratios but it won't do you any good. Every soil has a different concentration in clay. My suggestion is, as most people suggest, make test mixtures and try them. It's the only way to know. Worst case scenario by testing; you learned something new  |
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and maybe I'll add ashes too.
