#11  
Old 06-29-2008, 08:47 AM
Apprentice
 
Join Date: Oct 2007
Location: SC usa
Posts: 126
Default Re: TIP: Mixing Vermiculite Concrete

Wiley,
I had so many bags of vermiculite that I wasn't really keeping count when making the oven complex, but I starting getting concerned about quantity when doing the pool bottom. About Halfway through, I figured I was getting about 3 cubic feet out of a bag and had to adjust my depth accordingly to make sure that what I had covered the area. Then at the end, I ended up with 7 bags left over, so thought that maybe they were about 3 & 1/2 feet.

I noticed they were actually packed by weight and not by volume... I think there is a lot of settling, plus the act of mixing compresses out the air spaces...
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  #12  
Old 04-24-2009, 05:51 PM
Serf
 
Join Date: Apr 2009
Location: Raleigh, NC
Posts: 5
Default Re: TIP: Mixing Vermiculite Concrete

Wiley,

I just mad concrete using 4 cubic feet of vermiculite and .6 cubic feet of portland and filled 16 sq. ft. 3" deep. That works out to 4 cu.ft.
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  #13  
Old 04-25-2009, 10:29 AM
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Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: TIP: Mixing Vermiculite Concrete

"For the pool vermicrete, I could have borrowed a neighbor’s concrete mixer"

I found that using my concrete mixer tended to "break down" the vermiculite particles. This made for a higher density - not as good for insulating. I now mix it by hand using a small garden shovel and wheelbarrow.

Also consider adding perlite (large granules). This seems to improve the workability if you are using a screed to archive the dome shape.
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  #14  
Old 04-25-2014, 12:37 PM
Serf
 
Join Date: Apr 2014
Location: new Prague mn
Posts: 1
Default Re: TIP: Mixing Vermiculite Concrete

Does anyone know if you can lay the oven floor on the vericrete or do I need to pour a slab over the top of the vermicrete. If so how thick should this be??
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