#11  
Old 05-12-2010, 08:34 PM
Laborer
 
Join Date: Apr 2010
Location: Burna, KY
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Default Re: Vermiculite cement ratio question

I poured my perlite mix Sunday and by tuesday it was as hard as concrete, no pun intended. Some more experienced readers may be able to give you an exact length of time. I will say don't worry when on the second day it still has the consistency of a rice krispy treat because it will, but another day or so and it will become very firm.

view my oven at:
http://www.fornobravo.com/forum/f21/...cky-12829.html (42" Pompeii in Kentucky)

Last edited by ckdickerson; 05-12-2010 at 08:38 PM. Reason: to add link
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  #12  
Old 05-12-2010, 08:45 PM
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Default Re: Vermiculite cement ratio question

I wet-laid firebrick on mine the next day, but if you are a worrier, wait a week or a couple of days. Concrete (or perlcrete or vermicucrete) does not reach final strength in a linear fashion, it is at better than 50% within a day and 80% within a few days.

It is common to lay CMU walls on concrete that is a day or 2 old. It all depends upon the calculated loading.

Caveat: Done correctly. Allow for error if in doubt.
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  #13  
Old 05-13-2010, 03:51 AM
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Default Re: Vermiculite cement ratio question

Hey Tom,

Very interesting chart. Lot of useful information there. I'm definitely saving this info for the next build
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  #14  
Old 05-14-2010, 05:49 AM
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Location: Chesterfield, VA
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Default Re: Vermiculite cement ratio question

I was going to pour the vermicucrete 2 days ago but we had a strong storm system come thru and it's been raining on and off ever since. I was outside working with a flashlight till 11 last night getting my form all set up. Unless there is another downpour tonight, I will be pouring the mix then. I am going to do 5 inches of 7-1 mix. Then I have to find something else to do for about a week while I let it set up properly. Guess I can cut my firebrick this weekend.
Thank you everyone for all the advice.
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  #15  
Old 05-14-2010, 09:57 PM
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Location: Chesterfield, VA
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Default Re: Vermiculite cement ratio question

I did the pour tonight. Just barely beat the thunderstorm that rolled in(I covvered it before the storm came.) Shouldn't call it a pour....more of a shovel. kind of like shoveling S#%t.

Last edited by WoodchuckDad; 05-14-2010 at 10:21 PM.
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  #16  
Old 05-14-2010, 10:00 PM
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Default Re: Vermiculite cement ratio question

At Least it is light #&%@!
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  #17  
Old 05-14-2010, 10:32 PM
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Default Re: Vermiculite cement ratio question

Well I had 3 4 cf bags and only expected to use just under 2 of them....and ended up using all 3. I was planing to do 5.5 inches of vermicrete and I ran out thinking I was gonna have to do another pour....but after I skreeed it all it was 4 inches of 1/7.5 cement/vermiculite mixture. Guess it will have to be enough.
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  #18  
Old 05-15-2010, 07:32 AM
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Default Re: Vermiculite cement ratio question

I think the longer you can wait before going onto the floor the better, not because of the increased strength gained, but the drying out of the vermicrete. That moisture on the bottom is the hardest to get rid of. Taking the build slowly is better. Let nature do some of the work for you, unless you're in a real hurry.
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