Man, I searched the web over and under for some refererence to building kiln shelves out of refractory castable and I finally (after months of searching) came up with this research article (norwegian microsilica company experiment). These guys make a synthetic micro silica that apparently helps create the best mullite matrixes ever. They are really pumped about what they do, and I got really pumped when I finally found validation for my assumptions.
Today I put together forms for these castable kiln shelves - tomorrow I cast them. All of them are 18 inches wide and 36 or 30 inches long, and last ut not least 1 3/4 inches thick. I rented a concrete vibrator to bring the material into the tightest possible relationship - a relationship that will hopefully foster a fecund grove of mullite crystals. I'll hopefully post photos after tomorrow.
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