#11  
Old 08-05-2011, 04:54 PM
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Default Re: Who has used the calcium aluminate option for mortar?

Search for ciment fondu
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  #12  
Old 08-14-2011, 02:03 PM
Peasant
 
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Default Re: Who has used the calcium aluminate option for mortar?

Hi
Around here RPC has what is called Luminite Cement. So ask for it. What I have found is it would be the replacement for Portland in the mix. It is not a premix like others mentioned.
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Old 08-14-2011, 10:13 PM
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Default Re: Who has used the calcium aluminate option for mortar?

Search for a local 'refractory', they will likely have ciment fondu.
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Old 08-15-2011, 10:09 AM
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Default Re: Who has used the calcium aluminate option for mortar?

I recently demo'd my first oven as part of building my new one. I found some issues I have posted about elsewhere on the forum, but the homebrew was not on of them. It is hard as a rock and adhered so strongly to the bricks I gave up on chipping it off because the brick breaks before the mortar. I've resorted to cutting it off on the bricks I'm reusing. I jus dont see a reason to use anything else.
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Old 08-15-2011, 02:38 PM
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Default Re: Who has used the calcium aluminate option for mortar?

Quote:
Originally Posted by shuboyje View Post
I recently demo'd my first oven as part of building my new one. I found some issues I have posted about elsewhere on the forum, but the homebrew was not on of them. It is hard as a rock and adhered so strongly to the bricks I gave up on chipping it off because the brick breaks before the mortar. I've resorted to cutting it off on the bricks I'm reusing. I jus dont see a reason to use anything else.
But if your oven is less than a couple of years old and has therefore had little use and you have not tried a calcium aluminate mortar, how can you make any kind of comparison?
But I think you are right, for the temps we fire to the home brew has proved quite adequate.
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Old 08-15-2011, 02:55 PM
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Default Re: Who has used the calcium aluminate option for mortar?

I didn't mean to make a comparison, sorry if it somehow came out that way. My point is the only reason to use calcium aluminate IMHO is if there is some issue with the standad home brew you are trying to avoid. I've found no such issue after building two ovens with it and inspecting one after about 100 firing. Calcium aluminate is more expensive, harder to find, harder to work with, and calcium aluminate mortars seem to be more prone to cracking based on observations on this forum. If our application does not require it for structurally integrity why use it?
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Old 08-15-2011, 03:39 PM
Serf
 
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Default Re: Who has used the calcium aluminate option for mortar?

Hi picked up your thread, I am using Ciment Fondu from Kerneos Inc. . I am using their aggregate called "Alag" in Fine and Coarse mixture. The mix will be 3 x Alag to 1 x Ciment Fondu. dry mix for min 6 minutes and then radually add water until a good flow in the hand is achieved. Grab some wet cement and bounce it in your hand, it should be firm but not too wet or dry. I was told I will, with limited experience know when it is right. When cast this will be good for temps in oven to 1200 deg. Advice came from a team member in their Purfleet office, here in Grays, Essex, England. I have not cast yet still prepping. The materials to cast will be the only new product I will use as I am attempting to use recycled products that are surplus from local building projects.
I will in due course be posting some pictures. I will be using wet sand as the mould,base diameter 36 inches, dome height 40, entrance height to oven 23 inches. Diameter of entrance 16inches. Above wet sand I will be placing at least 3 sheets of wet newspaper.
I was advised that if casting in above 25 degrees to assemble a shade and to spray the cement to stave off too rapid hydration. I am told it "goes off" in a little over 2 hours and therefore workable to my needs. A little apprehensive as I have never attempted anything like this before but......
Piscatorsalmotrutta (trout fisherman!)
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  #18  
Old 08-15-2011, 05:08 PM
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Default Re: Who has used the calcium aluminate option for mortar?

Quote:
Originally Posted by shuboyje View Post
I didn't mean to make a comparison, sorry if it somehow came out that way. My point is the only reason to use calcium aluminate IMHO is if there is some issue with the standad home brew you are trying to avoid. I've found no such issue after building two ovens with it and inspecting one after about 100 firing. Calcium aluminate is more expensive, harder to find, harder to work with, and calcium aluminate mortars seem to be more prone to cracking based on observations on this forum. If our application does not require it for structurally integrity why use it?
Yes, I agree with everything you said.
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  #19  
Old 08-15-2011, 05:14 PM
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Default Re: Who has used the calcium aluminate option for mortar?

Trout fisherman,
When you first start using the stuff do not make up too much. You can make up small batches as you go, the stuff goes off pretty fast and is expensive so don't waste any.I find covering the casting in cling wrap as soon as it's finished works well to lock in the required moisture for hydration. Curing for 24 hrs is all that is required because the hydration is complete in that time. You can then remove it from the mould.
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  #20  
Old 08-16-2011, 05:04 PM
Serf
 
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Default Re: Who has used the calcium aluminate option for mortar?

Hi David S, I plan to cast the mix over a sand mould in one go, I was a little worried that doing it i steps it might not bond correctly, I was planning on mixing my 3 to 1 twice and immediately casting it over the sand mould. I have now emailed Genine, the scientist at Kerneos who has been kindly advising me. I thought I would have a couple of wt hours to work the mix over the mould and get it right, so to speak.
Piscatorsalmotrutta (Trout fisherman!)
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