I am making a tandoori oven using two 18" ceramic flower pots that are attached top to top with chicken wire. I found a recipe online for refractory cement and I don't think this will work. 1.5 parts portland cement, 2 parts sand, 2 parts perlite and 2 parts clay. I slathered this all over my pots and it is now cracking. The stuff that fell next to pots is grey and very crumbly.
What should I use to cover the outside of my pots?
When I fill my outer container with insulation, is perlite and lava rack sufficient?
Re: Tandoori Problem
Forno Bravo sells a fabulous refractory mortar mix...well worth the money for most folks. Making your own "home brew" refractory mortar is discussed at length in the thread I've noted below.
I've never seen perlite in anything other than an insulating component (never in a refractory mortar). Lots of good info in the above thread. Plenty of documentation in the forum on insulating with perlite or vermiculite. Insulation tends to be either a ceramic fiber blanket or perlite/vermiculite with just portland cement (usually recommended ratios anywhere from 6:1 to 10:1 as non-structural material). Portland cement does not stand up to the high temperatures of a WFO or Tandori, so in those cases the additional components in refractory mortar are really important...lime and/or calcium aluminate being the major structural materials that stand up to high heat.
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