refractory concrete recipe and mould plan?

[sonomacast]

I want to build an outdoor oven (Pizza) and basically I have spent a while reading the books and studying the internet and had decided to have a go at using bricks and blocks however I have not laid a brick ever but by trade I am a shuttering carpenter (Formwork) so the obvious and easiest thing to do would be to build my own form (Mould)for the dome.
Concerns I have are, what sort of reinforcement do I use as I guess that steel re-bar would expand with the heat and crack the dome or is this not the case.
(How are the other pre cast domes manufactured?)
Does anyone know of any plans for a form to make pre-cast domes and also how do I make refractory concrete?
Any other info would be greatly appreciated. Thank you

[dmun]

you might want to look at this nearly identical inquiry today.

Refactory cement comes, like quickcrete, in premixed dry bags. I've never heard of anyone making their own, but of course I haven't heard of everything.

[CanuckJim]

You can make your own refractory concrete out of LaFarge Fondue refractory cement, pea gravel and brick sand. Just follow the proportions given on the Fondue bags. This ain't cheap.

Jim