Originally posted by michelevit
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I've been looking at my company's refractory knowledge base. Alumino silicate refractories that are extremely robust at temperatures over 1830F, are not so robust at pizza oven temps unless first fired over 1830.
i.e high temp refractories are not necessarily so good at low temps. They need the high temps to cure.
The info discusses "low cement" bricks, which have some calcium aluminate cement in them, plus other binders that harden by different mechanisms, to allow for when the CAC passes through a weak zone from about 660 degrees up. Yep, CAC hardens by hydration, and although better than Portland, can still potentially breakdown at pizza oven temps.
Homebrew. arguably, has cement that hardens by hydration, lime that hardens by drying and carbonation, and clay that hardens by drying.
So in fact it is a pretty good "low temp" refractory.
You built it, it works and it has lasted.
I for one, feel more confident about the mortar in my oven just because you have taken the risk and demonstrated the durability.
Thank you very much for increasing the knowledge.
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