Alan Scott Oven - Hearth Slab (help!)
Alright Folks! I've just about lost my mind... trying to source a concrete for the hearth slab of my bread oven. I'm pretty much following the plans exactly, except that I plan on making the slab and dome a little thicker for longer heat retention.
In the slightly dated book, they recommend using a Calcium Aluminate cement (around 40%)- specifically something like Ciment Fondu (http://www.kerneos.com/content/en/Our-solutions/Products/CIMENT-FONDU/). However, this company does not sell small quantities and according to them, there are no retailers that carry it.
Kerneos pointed me toward Harbison Walker- they carry a sack mix castable refractory concrete specifically for bread and pizza ovens called Ovenzz castable. The only problem is that It costs $38 for a 55lb bag.. putting the slab alone around $500..
Who has built this oven? Did you open to build the hearth slab with just Portland? Did you buy a refractory? Is there some sort of cheaper Portland based high heat concrete that I should be looking at? How much did you spend? Has your slab already split in two? Help me out! Please :)
I'm based in South Jersey, close to Philadelphia.