#11  
Old 05-07-2014, 04:51 AM
Apprentice
 
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Default Re: Ciment Fondu / Refractory Castable Question

Thanks for that! I think I'll go with the tried and tested though... since I can at least find all the materials for that!

I have some questions about my build... I've posted them here: http://www.fornobravo.com/forum/f6/i...hts-20644.html (Initial build ideas - thoughts?)
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  #12  
Old 05-07-2014, 05:35 AM
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Default Re: Ciment Fondu / Refractory Castable Question

Just to clarify, that is 2% of the portland, not the total.
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  #13  
Old 05-07-2014, 05:38 AM
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Default Re: Ciment Fondu / Refractory Castable Question

Quote:
Originally Posted by Tscarborough View Post
Just to clarify, that is 2% of the portland, not the total.
Oops...I thought I mentioned that. I don't recommend taste testing either.
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  #14  
Old 05-07-2014, 10:30 AM
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Default Re: Ciment Fondu / Refractory Castable Question

This link seems to suggest adding gravel/crushed brick to the mix (whether you use portland or ciment fondu). How come this is not present in the home-brew mix?

Most mixes I've seen suggest crushed brick, but I'm finding that hard to find. Would a mix with ciment fondu, gravel and sand (in the correct proportions) perform better than the home brew mix?

Is it better to compromise the cement quality (heat resistance) or the aggregate?
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  #15  
Old 05-07-2014, 10:37 AM
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Default Re: Ciment Fondu / Refractory Castable Question

Homebrew is MORTAR, adding grogg makes it CONCRETE. DO NOT use gravel, buy cheap brick or firebrick and crush it up. Normal aggregate leads to explosive spalling under fire.

http://youtu.be/CNcFwByeUzw

Last edited by Tscarborough; 05-07-2014 at 10:41 AM.
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  #16  
Old 05-07-2014, 10:41 AM
Apprentice
 
Join Date: May 2014
Location: France
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Default Re: Ciment Fondu / Refractory Castable Question

Quote:
Originally Posted by Tscarborough View Post
Homebrew is MORTAR, adding grogg makes it CONCRETE.
Ahhh... this is useful information :-)

Do people generally crush the brick themselves, or buy it that way? I guess it's better if it's crushed firebrick, but is that necessary?
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  #17  
Old 05-07-2014, 11:16 AM
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Default Re: Ciment Fondu / Refractory Castable Question

The thermal co-efficient of expansion needs to be as close as possible to the matrix, so firebrick is very close, common brick is close enough. Hard stone aggregates or limestone are not.
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  #18  
Old 05-08-2014, 12:59 AM
Apprentice
 
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Default Re: Ciment Fondu / Refractory Castable Question

Thanks for that - appreciate it.

How would you identify "common brick"? I guess the composition varies depending on where you are?
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  #19  
Old 05-08-2014, 01:50 AM
Apprentice
 
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Default Re: Ciment Fondu / Refractory Castable Question

In what proportion do you add crushed brick to the homebrew recipe for a good concrete castable mix?
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  #20  
Old 05-11-2014, 12:02 PM
Apprentice
 
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Location: France
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Default Re: Ciment Fondu / Refractory Castable Question

Hi folks,

So far, I've come across a number of ciment fondu based castable recipes. Here is a summary:

CIMENT FONDU®
Grog / Sand / Ciment Fondu: 48 / 30 / 22%

Refractory concrete mixing recipe | Heat resistant concrete ingredients for wood fired pizza ovens.
Grog / Sand / Ciment Fondu: 43 / 29 / 29%

Four ŕ pain romain en argile - Page 1 - Four ŕ pain romain en argile
Grog / Wet self-harvested clay / Sand / Ciment Fondu : 47 / 20 / 20 / 13%

My question is regarding adding clay - here they say only to add it to portland cement based castables. Can I / should I add clay to a ciment fondu based castable recipe? For me, it looks like the biggest cost will be getting grog... if clay can somehow reduce the volume of this I need it would be good... also, does it in any way increase the setting time?
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