#11  
Old 02-28-2010, 02:22 PM
Serf
 
Join Date: Feb 2010
Location: SLC, Utah
Posts: 23
Red face Re: Monolithic dome vs pre-cast facetted dome.

Dave,
Thanks for the warning. I would probably buy a new drum.
Carol

Last edited by doughforthesoul; 03-01-2010 at 08:54 PM.
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  #12  
Old 02-28-2010, 03:28 PM
dmun's Avatar
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Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Monolithic dome vs pre-cast facetted dome.

Carol,

Refractory concrete mixes are generally sold ready to mix with water. There are homemade concoctions, but they are said to be hard to work with.

That was what Dave was politely saying about rephrasing the cement/concrete question. Maybe some specific links to the products you are considering using will get a more specific response. It's way out of my realm of expertise.
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  #13  
Old 02-28-2010, 11:59 PM
Peasant
 
Join Date: Feb 2010
Location: Northern Wisconsin
Posts: 33
Default Re: Monolithic dome vs pre-cast facetted dome.

Quote:
Originally Posted by doughforthesoul View Post
I have seen a steel barrel cut in half length wise and used as the inside of the dome then insulated. Will the thickness of the steel be thick enough to hold up to that kind of heat?
Any help is welcome.
Carol
From my experience with mobile BBQ cooking equipment, I would need to say no way. that thin gauge steel would burn through rather quickly.

One of my mobile cookers has a firebox made from cold-rolled 1/4" thick steel, and that is getting quite thin in some places after only 2 years of use, one day a week only, for four months of the year, and at much lower temperatures then are common with a WFO.

Think of a trash burning barrel, look at how quick those burn out, I think the short lifespan also has to do with the trace amounts sodium hydroxide (Lye), produced, it is a natural component in the ash from burned hardwoods and it eats steel very effectively.

Now if you were to use the thin metal from a steel drum as a form, when it burned away you would still have the masonry work for our oven in place.
(I'm thinking out loud here)
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  #14  
Old 03-01-2010, 01:48 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
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Default Re: Monolithic dome vs pre-cast facetted dome.

Carol,
If you go to a refractory supplier they will supply you with a dry product which has the refractory cement ,aggregate and other stuff mixed with it. All you have to do is add water and mix it, apply by hand over your form. The stuff sets quite quickly so do not mix more than about 20 Kg at a time. Then mix up a fresh batch and continue. The amount of water and temperature are much more important than that required for a normal concrete mix.
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  #15  
Old 03-01-2010, 06:27 AM
Serf
 
Join Date: Feb 2010
Location: SLC, Utah
Posts: 23
Default Re: Monolithic dome vs pre-cast facetted dome.

I am so glad I found this forum! Opinions needed.
Which material do you think is best for a mobile pizza oven?
Ferrocement with addition of fire clay or Refractory Concrete.
Thanks for all the imput.
Carol
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  #16  
Old 03-01-2010, 12:22 PM
Journeyman
 
Join Date: Jun 2008
Location: Melbourne Australia
Posts: 399
Default Re: Monolithic dome vs pre-cast facetted dome.

Use a refractory castable in the 1400c range, and include approx. 5% by weight s/s needles for strength.
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  #17  
Old 03-01-2010, 02:11 PM
Laborer
 
Join Date: Jan 2008
Location: Melbourne, Australia
Posts: 65
Default Re: Monolithic dome vs pre-cast facetted dome.

Quote:
Originally Posted by doughforthesoul View Post
I am so glad I found this forum! Opinions needed.
Which material do you think is best for a mobile pizza oven?
Ferrocement with addition of fire clay or Refractory Concrete.
Thanks for all the imput.
Carol
Hi Mark/Carol, I've put a fair bit of information on this site about making a castable dome. If you're interested please go to :

http://www.fornobravo.com/forum/f6/m...oven-9230.html (Mr Gs Aussie Castable oven.)

We have so far built nine ovens and have five ovens going strong using this method.

Cheers
John
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  #18  
Old 03-02-2010, 06:15 AM
Serf
 
Join Date: Jun 2009
Location: N. VA, USA
Posts: 7
Default Re: Monolithic dome vs pre-cast facetted dome.

Thanks everyone for the replies and information. I will probably go with a monolithic dome cast in place. Once the weather breaks and dsries out a little I hope to get a start excavating the base etc.

Mark
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  #19  
Old 03-02-2010, 04:46 PM
Laborer
 
Join Date: Jan 2008
Location: Melbourne, Australia
Posts: 65
Default Re: Monolithic dome vs pre-cast facetted dome.

Quote:
Originally Posted by doughforthesoul View Post
I have seen a steel barrel cut in half length wise and used as the inside of the dome then insulated. Will the thickness of the steel be thick enough to hold up to that kind of heat?
Any help is welcome.
Carol
Hi Carol, is this the sort of thing you're thinking of?

http://www.fornobravo.com/forum/f43/...oven-3717.html (Steel Dome Oven)
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  #20  
Old 03-02-2010, 04:58 PM
Journeyman
 
Join Date: Jun 2008
Location: Melbourne Australia
Posts: 399
Default Re: Monolithic dome vs pre-cast facetted dome.

Using the cut down barrel is not a smart move, after a few firings it will have flakey rusty crud falling ono the pizzas.
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