#11  
Old 01-25-2012, 11:33 PM
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Default Re: cast in place with home-brew ??

HI
All very interesting, A lot of people in the "it will work camp" and enough people still unsure. I expext to use my oven a lot, so I want it to last more then a few years.
It is going to be a lot cheaper to do an entire home brew dome but if I have to rebuild it every few years ???
I am interested to find out how many pure clay/sand domes are out there working after many years of hard service.
It was the original wfo for many thousands of years and they worked.
Mine will be in the open but will have insulation and a water resistant render, afire brick base and first course.
I need to get my mind made up soon, I rendered the blockowrk today and hope to start the oven next weekend
ROb
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  #12  
Old 01-26-2012, 12:06 AM
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Default Re: cast in place with home-brew ??

Quote:
Originally Posted by robertjusher View Post
It was the original wfo for many thousands of years and they worked.
And probably rebuilt every year too.
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  #13  
Old 01-26-2012, 01:08 AM
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Default Re: cast in place with home-brew ??

When we were in Europe in 2010 we saw lots of really old ovens. I was amazed to see how roughly built many of them were. Often large rocks rather than bricks were used and presumably some kind of clay or lime mortar in between. Because of the inaccesability of many of them I doubt whether they had been rebuilt on a regular basis. I think this is testimony to the dome form which is self supporting.

Last edited by david s; 01-26-2012 at 01:11 AM.
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Old 01-26-2012, 01:45 AM
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Default Re: cast in place with home-brew ??

Quote:
Originally Posted by david s View Post
Often large rocks rather than bricks were used and presumably some kind of clay or lime mortar in between.
But not made entirely of home brew mortar?
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  #15  
Old 01-26-2012, 02:07 AM
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Default Re: cast in place with home-brew ??

Quote:
Originally Posted by brickie in oz View Post
But not made entirely of home brew mortar?
No.

On a scale of strength from weakest to strongest I think it would be
1. Cob (unfired clay)
2. Lime castable (Homebrew)
3. Unfired calcium aluminate castable
4. Firebrick/ fired (to 1200 C, partially vitrified) calcium aluminate castable

All of them work

Last edited by david s; 01-26-2012 at 03:06 AM.
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  #16  
Old 01-26-2012, 05:00 PM
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Default Re: cast in place with home-brew ??

Castable refractory is to soft for a floor unless it has been fired, you can scratch the floor easily. Fired castable is still not the ultimate. Fired bricks is the way to go. The homebrew is a poormans sustitute and whilst it will "work ", it is not recommended. Heck, Cal.Sil board would work, but who the feck would use it.
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  #17  
Old 01-26-2012, 06:23 PM
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Default Re: cast in place with home-brew ??

Quote:
Originally Posted by Johnny the oven man View Post
Castable refractory is to soft for a floor unless it has been fired, you can scratch the floor easily. Fired castable is still not the ultimate. Fired bricks is the way to go. The homebrew is a poormans sustitute and whilst it will "work ", it is not recommended. Heck, Cal.Sil board would work, but who the feck would use it.
Castable refractory (unfired) is softer than firebrick, but harder than soapstone, which is often used for floors.
Cal. Sil might be refractory enough, but has no density to store any heat and is way too soft.
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Old 01-27-2012, 09:10 PM
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Default Re: cast in place with home-brew ??

Hi,
I built my oven 2 years ago using a concrete mix made from Blue metal (crusher dust), Ciment Fondu, water and Antec melt extract fibers. It works out a lot cheaper than castable and after 14 firings it has no cracks. The recipe is on the Kerneos Ciment Fondu site Ciment Fondu®
Regards John
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Old 01-27-2012, 09:29 PM
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Default Re: cast in place with home-brew ??

Hi Johnb,
can you post some pictures of your oven?
Also, do you own a sloop?
Dave
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  #20  
Old 01-27-2012, 09:55 PM
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Default Re: cast in place with home-brew ??

Dave, Sorry I don't own a sloop. Don't like water and probably too expensive. I have attached 3 photos to give you an idea.
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cast in place with home-brew ??-29042010-002-.jpg   cast in place with home-brew ??-20052010.jpg   cast in place with home-brew ??-26042010-003-.jpg  
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