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Re: concrete for hearth slab
From the WFO board
Posted by Jon
In Reply to: concrete for hearth slab posted by ken
I just built a pizza oven completely from concrete. Concrete does not do well with fire so I think it works best if you keep fire from coming in contact with the concrete by lining the fire box with granite, heavy Mexican style clay tile, or some sort of stone slab. The same goes for the area above the fire. Use plenty of rebar in the slab too. In fact, use rebar everywhere you don't want the concrete to crack.
Quickrete is fine, but if you are going to do very much - it seemed I mixed dozens of loads - buy a bag of Portland Cement (around $7 or $8 here in the states)and a load of gravel and sand. Directions are on the back of the bag. it's cheaper.
Jamie and Katrina's brick oven with temperature gauge, in Victoria.
Concrete blocks used for the oven’s outer walls. By Joe in Connecticut USA
Wood fired family oven and chimney project by Robert in Austria
My oven with fireplace, cook food and heat water, by Joel in Philippines
Baking sourdough breads in quantity in Canada
Pizza oven and hut built by Tony in Philippines