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  #31  
Old 12-30-2009, 01:17 PM
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Default Re: brickless dome on a shoestring oven

Congrats! It looks like it's going great. I'd still keep an eye on the dome in the future, but it looks like you probably are going to be fine. I didn't get any cracks until about the 3rd or 4th big fire; but I'm fairly confident in my dome's ability to stand up at this point. I think you should be as well. So far, so good on the experiment with the homebrew refractory... keep us informed about it's longterm performance!
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  #32  
Old 01-05-2010, 08:03 AM
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Default Re: brickless dome on a shoestring oven

New Years Pizza party was a huge success. Cooked many pies. The oven has since had
several 'scary' fires and no signs of failure. I would recomend this method of construction to anyone building an oven. It was low cost and quick to build. No tile saw or brick cutting needed . The sand form worked great and built a perfect dome. The oven heats up in less than an hour and 90 second pizzas were not a problem.

brickless dome oven gallery here...Gallery | bricklessoven
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  #33  
Old 09-19-2011, 04:38 PM
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Its been about 20 months since you finished your oven....How is it doing after that much time and use?
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  #34  
Old 09-19-2011, 05:57 PM
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Default Re: brickless dome on a shoestring oven

Oven still working great. Just had a huge all day party 2 weeks ago. Cooked maybe 50 pies. One of the guests was pizza chef and he was impressed by the oven.

Still no cracks in the dome. Oven working great and makes great pizza.
Let me know if you have any other questions. I'm actually building another oven based on this design.
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  #35  
Old 09-20-2011, 08:47 AM
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Default Re: brickless dome on a shoestring oven

Do you have details on the mixture ratio for your high temp mortar (%fireclay, %cement, %sand, %lime)? I'm weighing costs right now and your approach sure looks attractive. Do you think it could be done without the rebar cage or using metal mesh (1/4") instead? Thanks.
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  #36  
Old 09-20-2011, 11:58 AM
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Default Re: brickless dome on a shoestring oven

The mix I used is the high temp mortar mix which is
One part Portland cement
One part lime
One Part fireclay
Three parts sand.

Mix well dry and slowly add water until it is saturated enough to be wet.

I wouldn't skip the rebar. I think it adds substantially to the strength of dome structure. Rebar is cheap enough. We used a simple angle grinder to cut the rebar to short lengths and mig welded it with a gasless 110 volt wire feed gasless welder. The rebar was done in less than one hour with three people helping.

I was anticipating cracks as the oven aged and believed that the rebar would hold in the broken pieces. So far no cracks!
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  #37  
Old 10-23-2011, 03:59 AM
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Default Re: brickless dome on a shoestring oven

HI
I am really thinking making my build the same, just a question. Is the home brew mortar setting as hard and as long lasting as brought castable? And do you have any current photos to show how a few years have gone?, any dressing up of the oven etc
Thanks
Rob

Last edited by robertjusher; 10-23-2011 at 04:02 AM.
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  #38  
Old 11-11-2011, 01:29 PM
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Default Re: brickless dome on a shoestring oven

A sand mould is not difficult and getting the form right is simpler than you would think. Here are a couple of tips.
1. Cut a stick to the exact internal height you want the dome to be and place it in the middle, then pile the sand around it .

2. Use moist sand (10% water if you want to be really fussy)

3. Tap the outer surface with the flat of a trowel, eyeing the profile as you do this. It will become remarkably accurate.

4. Cover with strips of wet newspaper prior to "mudding over".

5. Chop up some sisal rope or add animal hair to the mix to assist water removal (it burns away leaving mini pipes that steam can find its way out.
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  #39  
Old 11-11-2011, 01:35 PM
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Default Re: brickless dome on a shoestring oven

While rebar reinforcing may seem like a great idea to increase strength, remember that heat will accelerate any corrosive reaction. I think rust will eventually prove to be the undoing of this idea in the long term. When rebar rusts substantially it increases in volume producing stress cracks in the refractory material. The standard reinforcing for refractory is stainless steel needles presumably for the previously mentioned reason.
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  #40  
Old 11-11-2011, 07:38 PM
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Default Re: brickless dome on a shoestring oven

Um, I don't see any exposed rebar - why would it be at risk?
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