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Old 10-03-2012, 04:10 AM
david s's Avatar
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Default foam concrete

OK first up have a look at this link and you"ll get the idea of how this stuff works. There is plenty about it on the net.

Light Weight Concrete

I should think it should be possible to use it as a replacement of vermicrete. or perlcrete as under floor insulation. I have an idea that it would dry out better than vermicrete or perlite because it would contain way less water. it should also be less of a problem of acting like a sponge, but we shall see. As the stuff only costs around $15 a litre (conc) it is also way cheaper than perlite or vermiculite. one litre is diluted 30 times with water which expands another 22 times in the foam generator.That is 660 litres. A lot easier to store and freight one litre of concentrate than store bags and bags of vermiculite.
Perlite and vermiculite alone are both OK up to 1100 C by the way.

Last edited by david s; 10-03-2012 at 04:18 AM.
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Old 10-03-2012, 06:30 AM
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Location: London, UK
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Default Re: foam concrete

I don't think it'll work...

Quote:
What type of cement is appropriate for lightweight concrete ?
Lightweight concrete may be produce with any type of portland cement or portland cement & fly ash mixture. The performance characteristics of type II, type III and specialty cements carries forward into the performance of the lightweight concrete.

Portland cement spalls (violently) at 600c or so...
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Old 10-03-2012, 06:55 AM
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Default Re: foam concrete

Keep up the resarch David.
If it can be used as a cheap replacement for V/Pcrete, that would be great. That stuff is getting more and more expensive every day. I'm looking forward to when you get into the testing stage.
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Old 10-03-2012, 07:17 AM
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Default Re: foam concrete

Spinal, cement does not spall at any temperature, it simply degrades. The AGGREGATE in concrete can spall and at a lot lower temp than 600 degrees centigrade. The lightweight/foamed concrete David is talking about does not contain large aggregate that is subject to spalling and as underfloor insulation will not see extremely high temps.
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Old 10-03-2012, 01:31 PM
david s's Avatar
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Default Re: foam concrete

It would be like vermicrete, but the grains of vermiculite are substituted with air.So instead of having a mini sponge in the space you'd have an air space. Apparently the stuff does not absorb water, so that would be a huge advantage.

Last edited by david s; 10-03-2012 at 01:34 PM.
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Old 10-03-2012, 02:26 PM
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Default Re: foam concrete

Hi David,

Does this product have an insulation R-value, if so what is it?
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Old 10-03-2012, 02:44 PM
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Default Re: foam concrete

That would depend on the ratio of cement to air that you decide to use. I would imagine it would be the same as vermicrete or perlcrete.it's all about the density you choose.
eg. A 1:4 vermicrete has a thermal conductivity W/(mK) of 0.16,
1:8 is 0.09
The R value is a reciprocal of the K value.
Wiki puts air entrained concrete at R 3.9, standard concrete at R 0.08 and loose vermiculite at R 2.13- R 2.4
Sounds almost too good to be true.

Last edited by david s; 10-03-2012 at 03:27 PM.
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Old 10-03-2012, 03:53 PM
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Default Re: foam concrete

Sounds good,can you just get it from any concrete supplier?
Im not too far away from building one for the Community Garden and wouldnt mind using it under floor and over dome.
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Old 10-03-2012, 03:59 PM
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Default Re: foam concrete

You can try them, but my local "expert" concrete additive supplier had never heard of it. You may have to search the net and get it online.
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Old 10-03-2012, 06:46 PM
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Default Re: foam concrete

This looks really good. I would expect you could also trowel/screed it flat, which is hard to do with vermicrete.
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