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  #41  
Old 10-19-2012, 10:36 PM
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Default Re: foam concrete

Hi David,
How do you plan to test it with heat/fire?
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  #42  
Old 10-19-2012, 10:50 PM
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Default Re: foam concrete

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Originally Posted by Laurentius View Post
Hi David,
How do you plan to test it with heat/fire?
No, I said strength. I do plan, however to try the foam in conjunction with clay slip and also calcium aluminate cement, can't see why it won't work, but I'll find out.
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  #43  
Old 10-19-2012, 11:03 PM
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Default Re: foam concrete

Yes, I know you said strength, but if it holds up, it will be use as the insulation layer between the floor bricks/tiles and the stand base,right?
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  #44  
Old 10-19-2012, 11:05 PM
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Default Re: foam concrete

Yes, just like a regular vermicrete slab.
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  #45  
Old 10-20-2012, 12:03 AM
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Default Re: foam concrete

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Yes, just like a regular vermicrete slab.
So, will you test your trial foam-concrete for its insulation value in comparison to the regular vermicrete slab?
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  #46  
Old 10-20-2012, 12:47 AM
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Default Re: foam concrete

No, probably not as it's a 50/50 vermicrete, air brew, which would presumably be better than all vermiculite vermicrete. I wouldn't expect the difference to be great, so I won't bother. I'm more interested in it being cheaper, taking up less water and easier to pour and finish.
Perhaps when I make up the next batch I'll try a 5:1 foam, cement and test it's insulating capacity against a regular 5:1 vermicrete sample. Guess we can call it foamcrete.

Last edited by david s; 10-20-2012 at 09:34 PM.
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  #47  
Old 10-22-2012, 07:32 PM
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Default Re: foam concrete

I experimented today by making a 50/50 foam,clay slip mixture. As expected it made a very light mix that had half the specific gravity (density) of normal casting slip. The mix poured beautifully and is drying in the mould as I type. I have high hopes for this stuff and hope to be able to cast and fire a suitable insulating panel for the door. It will be easy to adjust the ratio of foam to clay and therefore the strength and insulating capacity of the panel.
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  #48  
Old 10-23-2012, 02:56 AM
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Default Re: foam concrete

It works with clay? that's awesome. It's got pretty good qualities if it can make clay particles do what you want.
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  #49  
Old 10-23-2012, 03:06 AM
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Cool Re: foam concrete

Gudday Dave
Interested to know what clay slip is exactly. Now the panel is the insulation for a door right....is it just dried or are you going to fire it like pottery? Could you cast the bolts in the insuated panel so when you bolt your front wooden face on ( i know you like the wood look) the heads remain cool?When I first stared to read this the foam cement sounded a lot like like hebel.....but this clay panel takes it to another place completely. Interested to see where you take this
Regards dave
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  #50  
Old 10-23-2012, 03:43 AM
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Default Re: foam concrete

Clay slip is basically water and clay mixed together. If you want to know more look up slip casting. You can pour it into moulds and then fire it to make it permanent, but of course you need access to a kiln.
Having experimented way too much in an effort to create a suitable insulating panel a really good safe solution still eludes me. I'm hoping this could work well. I've tried dense castable both fired and unfired, Hebel, lightweight castable fired. All have failed in the long run as they're either too heavy, don't insulate well enough or they're too weak and abrade too easily.
My current door weighs only 2.4 Kgs and I want to retain the lightweight so it can easily be used one handed.
The finished foamcrete product is essentially the same as Hebel, although it uses a different process. With the foam it is easy to control the density. By using clay it is possible to overcome the problem of Portland cements inability to handle high heat.

Last edited by david s; 10-23-2012 at 05:34 AM. Reason: clarity
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