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  #61  
Old 12-01-2012, 01:35 PM
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Join Date: Nov 2012
Location: Austin TX
Posts: 60
Default Re: foam concrete

I'm new to a lot of the WFO stuff, but is this likely to be the method of choice for hearth insulation, pouring an insulated layer on the hearth rather than using ceramic boards or the like? is that the 'end goal' behind the experimentation?

I think I read correctly that it is a very liquid mix, so would you anticipate being able to use it anywhere else? Build a form around a completed dome and pour to embed the dome in a solid cube of foam concrete?

Lastly, are you using your home-made foamer for the tests still, but using the 'official' foaming liquid?

Thanks in advance! I'm just starting thinking about getting materials together right now, would definitely like to know if there is a better / cheaper option for insulation under the floor or over the dome.
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  #62  
Old 12-01-2012, 03:11 PM
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Location: Townsville, Nth Queensland,Australia
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Default Re: foam concrete

Quote:
Originally Posted by pfennigthecat View Post
I'm new to a lot of the WFO stuff, but is this likely to be the method of choice for hearth insulation, pouring an insulated layer on the hearth rather than using ceramic boards or the like? is that the 'end goal' behind the experimentation?

I think I read correctly that it is a very liquid mix, so would you anticipate being able to use it anywhere else? Build a form around a completed dome and pour to embed the dome in a solid cube of foam concrete?

Lastly, are you using your home-made foamer for the tests still, but using the 'official' foaming liquid?

Thanks in advance! I'm just starting thinking about getting materials together right now, would definitely like to know if there is a better / cheaper option for insulation under the floor or over the dome.
Yes, I use my homemade foam generator, it works fine, but you need the correct foaming agent which produces foam that does not deflate and is chemically compatable with the cement. Calcium silicate board is probably a superior solution, but it is expensive (for where I live at least)
Forget about using foamcrete over the dome, unless you have some sort of outer mould to contain it. It refuses (in my experience at least) to work up to a plastic mix. If you are doing an enclosure it is probably better to use loose dry perlite or vermiculite, although you could cast a solid cube of foamcrete, let it dry and stucco over the surface for strength.Come to think of it you could easily sculpt the foamcrete cube into whatever form you wanted.

Last edited by david s; 12-01-2012 at 03:31 PM.
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  #63  
Old 12-11-2012, 12:54 PM
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Default Re: foam concrete

Here are some photos of my homemade foam generator that I've been using successfully for a while now.The first shot shows the internal bit, the second one shows the position used when adding compressed air with the tap in open position. It takes about three minutes for the foam to start coming out the tap.The last shows the position I use when pushing the foam out. I use bike floor pump for this as it is a better controlled way of pushing out the foam. As you can see it produces 20 litres of foam from a charge of 20 ml concentrate and 2 litres of water (this needs to be calculated in the total water addition of the mix). You make up a slurry of cement, then add the foam to it either in a mixer or barrow. It is ridiculously simple.
Attached Thumbnails
foam concrete-pc120169.jpg   foam concrete-pc120168.jpg   foam concrete-pc120167.jpg  

Last edited by david s; 12-11-2012 at 12:57 PM.
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  #64  
Old 12-11-2012, 09:45 PM
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Join Date: Oct 2012
Location: Waikato New Zealand
Posts: 48
Default Re: foam concrete

so what do you use as a foaming agent? Dish washing liquid?
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  #65  
Old 12-11-2012, 09:49 PM
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Default Re: foam concrete

Quote:
Originally Posted by waikato pizza View Post
so what do you use as a foaming agent? Dish washing liquid?
http://www.fornobravo.com/forum/f44/...tml#post139631 (foam concrete)
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  #66  
Old 12-12-2012, 12:43 PM
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Join Date: Jul 2012
Location: North Carolina
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Default Re: foam concrete

I salute you for building a foam generator! From some earlier reading, there was a problem in exporting organically based foaming agent to India; blood was used in the production. If I remember correctly, the inorganic agent was sodium lauryl sulphate.

As an alternative to clay slip, there are castable refractories available, and investment casting, (sort of a lost wax process). They are designed to gain strength from drying or curing, then even greater strength when they are fired.

Carry on! I'm back to your pdf's
roger
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  #67  
Old 12-12-2012, 04:36 PM
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Default Re: foam concrete

Quote:
Originally Posted by RogerQ View Post
I salute you for building a foam generator! From some earlier reading, there was a problem in exporting organically based foaming agent to India; blood was used in the production. If I remember correctly, the inorganic agent was sodium lauryl sulphate.

As an alternative to clay slip, there are castable refractories available, and investment casting, (sort of a lost wax process). They are designed to gain strength from drying or curing, then even greater strength when they are fired.

Carry on! I'm back to your pdf's
roger
Using the foam in conjunction with castable refractory is on my to do list. Unfortunately there are way too many other things higher on the list.
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  #68  
Old 12-12-2012, 04:55 PM
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Default Re: foam concrete

Quote:
Originally Posted by RogerQ View Post
I salute you for building a foam generator! From some earlier reading, there was a problem in exporting organically based foaming agent to India; blood was used in the production. If I remember correctly, the inorganic agent was sodium lauryl sulphate.

As an alternative to clay slip, there are castable refractories available, and investment casting, (sort of a lost wax process). They are designed to gain strength from drying or curing, then even greater strength when they are fired.

Carry on! I'm back to your pdf's
roger
Gudday Rodger and Davids
Blood and bone was the main component of the old style fire fighting foam. Its use has been taken over by AFFF which main component is of course sodium lauryl sulphate, Sodium lauryl sulphate is also found in most hair shampoes ( check the label out on yours). Sounds like making this foam cement might be lot more achievable by the home handyman than I first thought.

Regards Dave
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  #69  
Old 12-12-2012, 09:46 PM
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Default Re: foam concrete

The chemical composition of the stuff is on post no. 14 on this thread.
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  #70  
Old 12-13-2012, 12:01 PM
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Default Re: foam concrete

Oops
Regards dave
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