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  #51  
Old 11-07-2013, 09:56 AM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

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Originally Posted by Tscarborough View Post
$8.48 per SqFt here: Ceramic Fiber Board

And much cheaper in bulk, I am sure.
Thanks! Checking now.
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  #52  
Old 11-07-2013, 10:44 AM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

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Originally Posted by RocketStoveBuilder View Post
We are not using Portland cement in our mix.
That is a wise move. I wish you well on your mix design, and your venture.
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  #53  
Old 12-03-2013, 05:42 PM
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Thumbs up Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

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Originally Posted by RocketStoveBuilder View Post
"So you are going to use 3:1:1:1 for commercial production based off a test fire and a one off recommendation, in spite of what is understood about Portland ratios industry wide???? I hope you have a good warranty policy....I'm done with this."


We are not using Portland cement in our mix.
RocketStoveBuilder, What is your mix? I am wanting to cast a dome out of a homebrew, have heard a few times it works, but am concerned with an explosion...lol... I'd really appreciate your help on gettingthis mix right as I too am a starting a small business (not rocket stoves) and can not afford to invest in a ton of commerical grade refractory cement. All I want to do is build one oven!! Please and thank you.

Ps Love your persistance and bravery!
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  #54  
Old 12-04-2013, 03:54 PM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

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Originally Posted by kira View Post
RocketStoveBuilder, What is your mix? I am wanting to cast a dome out of a homebrew, have heard a few times it works, but am concerned with an explosion...lol... I'd really appreciate your help on gettingthis mix right as I too am a starting a small business (not rocket stoves) and can not afford to invest in a ton of commerical grade refractory cement. All I want to do is build one oven!! Please and thank you.

Ps Love your persistance and bravery!
michelevit made a brickless oven on a shoestring (see the thread with that title) using the homebrew mix of 3:1:1:1 of sand, clay, lime and Portland cement.
Look further back in this thread, and you will see he is adamant that it works and is robust.
If you make sure it has fully dried and heat it very gently at first, giving any water a chance to migrate out slowly, it should not explode.
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  #55  
Old 12-05-2013, 05:45 PM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

thank you michelevit, does anyone know anything about Reno Bond 3000? Ive been told it can be used to cast an oven... Thanks!
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  #56  
Old 12-06-2013, 04:15 AM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

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Originally Posted by wotavidone View Post
michelevit made a brickless oven on a shoestring (see the thread with that title) using the homebrew mix of 3:1:1:1 of sand, clay, lime and Portland cement.
Look further back in this thread, and you will see he is adamant that it works and is robust.
If you make sure it has fully dried and heat it very gently at first, giving any water a chance to migrate out slowly, it should not explode.
Add polypropylene fibres to assist in safer water removal. They melt and burn away leaving a network of tiny pipes that steam can escape through.
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  #57  
Old 01-13-2014, 01:49 PM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

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Originally Posted by kira View Post
RocketStoveBuilder, What is your mix?
1:1:1 Fireclay, perlite, fine sand (30/40).

Dry mix.

Add.

3/4 Rutland 211 Refractory mortar. (any similar refractory cement/mortar should work.)

Dry mix.

Start with 3/4 water and check for consistency. After several castings we tend to think more water is better, but the drying time and the slower burn in process takes longer.

This has been working for us. Hope it helps.
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  #58  
Old 01-13-2014, 03:25 PM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

For an oven you want a strong dense mix, not an insulating one, so don't add perlite. The rocket stove application is different.
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  #59  
Old 03-16-2014, 01:14 PM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

Hey all!

Has anyone tested CSA (calcium sulfoaluminate) cements in a high-heat situation? This type of cement is available at the Home Depot under the name "Cement-All"- the bagged mix contain about 50-50 cement/aggregate, plus "air" (unless you are in California) and a low-range superplasticizing agent. Possible other things.
Pure CSA can be ordered from most concrete countertop suppliers.
Also, why not add pozzolans to the homebrew mix- fly ash, silica fume, metakaolin, etc? Probably could add some strength.
I also happen to have on hand hydrous potassium silicate, also known as "water glass". This is used in refractory applications, such as sealing radiators and hot water pipes- the silicate precipitates and is slightly expansive at high temperatures. From what I heard, anyway. 5 gallons costs less than $50.
I haven't tested this mix yet, but the following might yield a slightly more durable homebrew castable refractory- not suitable for rocket stoves, kilns, or the like, but possibly good enough for a pizza oven:
3 sand
1 pea gravel (larger aggregate size gives higher compressive strength)
1 fireclay
1/2 cementitious

The cementitious consists of 80% OPC, 10% silica fume, and 10% CSA. Too much CSA and the mix will set too fast for most people's comfort level.

I would mix the wet ingredients at 20% potassium silicate to 80% water...

Maybe I'll test it sometime...

I made my oven in the usual way from firebricks, using fireclay/portland mortar, and it's holding up great! I am curious about castable ovens because I think it would be fun to make a little one that could heat up faster and possibly be portable. Also, pretty darn easy and cheap. Why not?
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  #60  
Old 03-17-2014, 03:58 AM
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Default Re: Your Advice Re: HomeBrew Castable Mix Greatly Appreciated

Calcium sulfoaluminate (CSA) cement is not the same as calcium aluminate cement (CA). The CSA loses around half it's strength when heated to around 300 C, so I don't think it would be suitable. Stick with CA cement, but by all means give it a shot and report back. It may be better than the portland and lime homebrew.
Here's a good reference.

http://www.cementchina.net/web/uploa...2794825313.PDF

Last edited by david s; 03-17-2014 at 04:03 AM.
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