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Post by mannytheseacow on Oct 6, 2019 11:31:27 GMT -8
Hey, everyone. I’m working on a small single skin bell made from irregular stone. I’m wondering the best mortar mix to use for this. So far I only have one lift and I used 2:1 sand/fireclay for the mortar, but it doesn’t seem to hold to the irregularities in the stone well, and I’m concerned that in an earthquake the whole thing will fall apart. It’s a small stove and will be used very infrequently so I’m wondering if I could get away with a more traditional Portland mortar. Any suggestions?
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Post by Vortex on Oct 6, 2019 11:53:44 GMT -8
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Post by mannytheseacow on Oct 6, 2019 12:12:50 GMT -8
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Post by martyn on Oct 6, 2019 13:05:08 GMT -8
Both the mortars in your link are tried and tested over many years for the use in constructing pizza ovens.
The second recipe includes Aluminate cement and will set fast and hard, the first recipe only uses Portland cement but seems to work almost as well as long as it is not in direct contact with flames .
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Post by mannytheseacow on Oct 6, 2019 18:51:02 GMT -8
I talked to a local rock wall builder about this. He couldn’t speak to the refractory component but said the purpose of the mortar is to fill the small imperfections in the joints and not for structural stability, so he thought any mortar mix would work and that I should focus on getting tighter joint surfaces in the stone.
I’m including this here because I thought it was useful information. It means a lot more work on my end working each stone by hand, but as with most things, the easiest way isn’t always the right way.
When done like this, the sand/clay mortar is quite satisfactory. I also like that I don’t need to clean up between lifts or waste any mortar because it all rehydrates nicely.
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