refractory concrete Forum Guidelines Discuss refractory concrete in the Good Background Information forums; I'd like to make my walls in my oven using forms and refractory concrete.The only problem is that calcium aluminate ...

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I'd like to make my walls in my oven using forms and refractory concrete.The only problem is that calcium aluminate cement is almost impossible to find.Does anybody know an alternative mix for refractory concrete?Also,I know the formula for the height of an oven opening in relaton to the ovens size but what about the width.I am building a 32 by 36 oven with a dome height of 16 inches and a 10 inch high opening.Iwould like to make it about 22 inches wide.If anyone has any suggestions I would appreciate it.