#1  
Old 09-20-2009, 05:29 PM
Peasant
 
Join Date: May 2008
Location: nj
Posts: 26
Default Vermiculite/ cement- set?

I poured the 4" layer of 5:1 vermiculite/ Cement mixture. I mixed it to the consistency of oatmeal- dryer than cement. After 24 hrs. it is still not set....any suggestions?

Thanks,

Patric
Reply With Quote
  #2  
Old 09-20-2009, 05:53 PM
Les's Avatar
Les Les is offline
Il Pizzaiolo
 
Join Date: Sep 2005
Location: Carson City, NV
Posts: 2,853
Default Re: Vermiculite/ cement- set?

What do you mean by not "set"? Is it dry? I didn't go that route but to my understanding - it will not be a solid, it will have some compression.

Les...
__________________
Check out my pictures here:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


If at first you don't succeed... Skydiving isn't for you.
Reply With Quote
  #3  
Old 09-20-2009, 07:26 PM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Vermiculite/ cement- set?

Keep it damp. It will take up to 6 days to set enough to load.
Reply With Quote
  #4  
Old 09-21-2009, 06:02 AM
Peasant
 
Join Date: May 2008
Location: nj
Posts: 26
Default Re: Vermiculite/ cement- set?

By "set" I mean hard- like cement. will it always be 'spoungy'
Reply With Quote
  #5  
Old 09-21-2009, 09:32 AM
egalecki's Avatar
Il Pizzaiolo
 
Join Date: Mar 2008
Location: Virginia
Posts: 1,049
Default Re: Vermiculite/ cement- set?

It will never be like plain cement. It will be sort of spongy- sort of like cork. It will also crumble around the edges if you mess with it- I know it seems as though it will never be suitable, but it does work. I have several inches of it under my dome, and it's never compressed at all- but it was a major leap of faith to go ahead and trust it!
__________________
Elizabeth


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #6  
Old 09-21-2009, 11:22 AM
Peasant
 
Join Date: May 2008
Location: nj
Posts: 26
Default Re: Vermiculite/ cement- set?

I decided to minimize the amoutn of space covered to 2" beyond the hearth foot print and am using a round form to create the round shape---I am thinking that I never want to remove it for fear over time this 5:1 mix may crumble..to dust. PS my vermiculite is not the 3/8in size but the 1/4 to 1/8 size.....see any problem permanently leaving the frame or the 1/4 size verm.?

Thanks
Reply With Quote
  #7  
Old 09-21-2009, 12:04 PM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Vermiculite/ cement- set?

Is your form wood? I'd stay away from combustibles here - not every oven avoids cracks. Your vermiculite concrete may be a bit crumbly around the edge, but it isn't going to collapse.

Your vermiculite size is fine.
__________________
My geodesic oven project:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
,
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #8  
Old 09-21-2009, 12:20 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Vermiculite/ cement- set?

What about the really fine perlite, about the consistency of laundry detergent? I posted a question about it this morning but haven't received any responses (my post's verbosity may have scared off potential readers/repliers). Is that too fine to make good insulation? I already wrote this in the other thread but my concern is that it will pack too tightly and won't leave any voids for air...which is the critical function of any insulation of course. Would the answer differ depending on loose-fill vs. permcrete or do you want the same grain size (whatever "right grain size" means, large or small) regardless of whether you are loose-filling or making 'crete?

Thanks.
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Reply With Quote
  #9  
Old 09-21-2009, 12:48 PM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Vermiculite/ cement- set?

Go for a courser perlite. Better insulation value.
Reply With Quote
  #10  
Old 09-21-2009, 01:03 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Vermiculite/ cement- set?

Thanks Neil2.
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
TIP: Mixing Vermiculite Concrete cvdukes Tools, Tips and Techniques 13 04-25-2014 12:37 PM
? on ratio of vermiculite to cement toddlungman Pompeii Oven Construction 4 12-06-2013 03:22 AM
portland cement to vermiculite istoven Heat Management 2 07-27-2009 09:52 AM
vermiculite to portland cement mrgweeto Tools, Tips and Techniques 30 07-09-2009 05:29 AM
Refractory cement in vermiculite concrete Brian Hudson Getting Started 3 03-25-2008 06:37 PM


All times are GMT -7. The time now is 04:40 AM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC