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  #11  
Old 10-04-2012, 07:52 AM
Serf
 
Join Date: Jul 2012
Location: North Carolina
Posts: 3
Default Re: foam concrete

There is a product generically called Autoclaved aerated Concrete. Here is a link for their site in Georgia: SafeCrete.com - AAC Internet Sales / AAC Products / AAC Information / AAC Construction The company recommends the product for firewalls.

I stacked up some of the block for a hot smoker. When I add wood, the firebox is glowing red hot, while the exterior is just warm to the touch. After several firings, the block facing the fire seems slightly chalky on the surface. This material can be cut with a handsaw. Here is another link:
http://extension.ucdavis.edu/unit/gr...d_concrete.pdf
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  #12  
Old 10-06-2012, 12:40 AM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,858
Default Re: foam concrete

Foam concrete is quite different to Hebel or AAC. They use Aluminium powder to react with lime producing hydrogen which creates the bubbles. Foam concrete relies on generating the foam first then mixing it into the cement slurry, a far simper process by the sounds of it and should be a workable solution for the small operator.
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  #13  
Old 10-06-2012, 04:17 PM
Master Builder
 
Join Date: May 2011
Location: South Australia
Posts: 565
Default Re: foam concrete

I reckon the hardest part about making concrete with the aluminium powder and lime method would be getting the aluminium powder.

Our local explosives manufacturer used aluminium powder to boost the heat, and therefore the power, coming from his mining explosives.
That'd be the only largeish scale of industrial consumption other than Hebel that I've ever heard of.
So has your foamer turned up yet?
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  #14  
Old 10-06-2012, 06:39 PM
david s's Avatar
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Default Re: foam concrete

Mick,

No the foamer has not turned up yet. They are trying to sell me a $1000 machine to generate the foam, but I think I can build my own. At around $20 per litre incl. freight that's not too bad (even though it's 85% water) since they claim it will make 1000 L of foam. Only problem is that it's a min. order of 10L that's then 10000 L foam. Slight problem if you only wanted to generate enough to make one insulating slab.
Here is the chemical composition of the stuff. I told you the name would be long. Let me know what you think as you are the chemist man.

Dave

WATER 7732-18-5 81.0 - 85.0%
DIETHYLENE GLYCOL BUTYL ETHER CAS number 112-34-5 8.0 - 9.0%
ALKYL SULFATE AMINE SALT +(6076P) --- 3.0 - 4.0%
SODIUM ALKYL SULFATE +(6079P) --- 1.0 - 2.0%
SURFACTANTS +(6082P, 6058P) --- 3.0 - 4.0%
TOLYL TRIAZOLE CAS number 29385-43-1 < 0.5%

Last edited by david s; 10-06-2012 at 06:52 PM.
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  #15  
Old 10-06-2012, 06:54 PM
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Join Date: Dec 2011
Location: Qld
Posts: 367
Default Re: foam concrete

Can you make it foam without the machine ?
and if you can Im sure there are people who would gladly buy some of the litres required of you.... me included. (and possibly a few more here in town)
Im about 8 hours south of you.
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  #16  
Old 10-06-2012, 07:00 PM
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Join Date: Oct 2009
Location: Ausitn
Posts: 3,128
Default Re: foam concrete

Why would they not sell it without the water, to be added at the site?
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  #17  
Old 10-06-2012, 08:09 PM
david s's Avatar
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Default Re: foam concrete

Quote:
Originally Posted by TropicalCoasting View Post
Can you make it foam without the machine ?
and if you can Im sure there are people who would gladly buy some of the litres required of you.... me included. (and possibly a few more here in town)
Im about 8 hours south of you.
Sorry, but it is against the forum rules. I could be accused of touting for business.
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  #18  
Old 10-06-2012, 08:10 PM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
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Default Re: foam concrete

Quote:
Originally Posted by Tscarborough View Post
Why would they not sell it without the water, to be added at the site?
No, that is the % water in the concentrate. you have to dilute it to make the foam.
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  #19  
Old 10-07-2012, 04:35 PM
Master Builder
 
Join Date: May 2011
Location: South Australia
Posts: 565
Default Re: foam concrete

Quote:
Originally Posted by david s View Post
Mick,

WATER 7732-18-5 81.0 - 85.0%
DIETHYLENE GLYCOL BUTYL ETHER CAS number 112-34-5 8.0 - 9.0%
ALKYL SULFATE AMINE SALT +(6076P) --- 3.0 - 4.0%
SODIUM ALKYL SULFATE +(6079P) --- 1.0 - 2.0%
SURFACTANTS +(6082P, 6058P) --- 3.0 - 4.0%
TOLYL TRIAZOLE CAS number 29385-43-1 < 0.5%
Hmm, two solvents (the water and the butyl ether), three soaps/detergents, and a corrosion inhibitor (the tolyltriazole)
Interesting. Its essentially some concentrated detergent, though the organic solvent and corrosion inhibitor must play some part.
Foaming it should really only require bubbling lots of compressed air through it, I reckon. If their foaming machine is "only" $1000, it's not going to be very complicated.
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  #20  
Old 10-07-2012, 09:17 PM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,858
Default Re: foam concrete

Thanks Mick, very interesting.
I plan on using a compresser, car tyre valve, some stainless tubing and a plastic jerry can with a tap to generate the foam. I think it should work. We shall see, still haven't got the foam yet.
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