#11  
Old 08-01-2009, 09:48 AM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Rammed earth base.

Quote:
I think I need to use a form of sand on something similar to shape the oven, as mine is going tobe quite low.
Remember - clay shrinks a LOT when it dries, and sand doesn't. You're going to want to dig out that form before the lengthly process of drying out that much clay.
__________________
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
  #12  
Old 07-05-2010, 09:10 AM
wood-fired's Avatar
Serf
 
Join Date: Jul 2009
Location: bradford on avon, UK
Posts: 16
Default Re: Rammed earth base.

I live quite close to you on the wiltshire/somerset border and we specialise in both wood-fired ovens and rammed earth, part of my landscape business. I'd like to know how you get on with your build, or even come and see you. I'm one of the founder directors of EBUK, set up to promote earth as a resource and have done a garden in Bath using only what we dug out of the ground, both clays and stone. spacemagic garden : projects p3
yes, ALL the stone and clay came out of the ground in lower Weston, Bath.
The rammed earth we used was made up from the friable clay, crushed concrete, grit sand and a small percentage of white cement. To adapt this to your project, it might go, clays 80%, aggregate 15% and high alumina cement 5%. It may work even without the cement as the heat will bake the clay anyway. I reckon you could build the whole thing with rammed earth and perhaps incorporate Leca in an insulating layer over the whole thing.
If you build it, I'll promote it on my website Wood-fired Ovens : Welcome

good luck and contact me if you want to meet up info@wood-firedoven.co.uk
Reply With Quote
  #13  
Old 08-01-2010, 03:51 AM
Serf
 
Join Date: Jul 2009
Location: UK
Posts: 24
Default Re: Rammed earth base.

Well, I gave up in a way. I had problems sourcing clay where I live, and realised that this year at least I did not have the time to make an oven. Under different circumstances I would have made my own, and I still want to do that one day.

I went out and bought a bespoke oven that arrived and I put in the back garden. The big problem for me with ready made ovens and also with many opens people make is that I only need an oven to make 2 - 6 pizzas in one session. Using bricks is fine if you need the retained heat for many pizzas and consistency over time. Also this material needs significant warm up time.

So, I went for a rapid heat up oven that uses modern materials and does not used the retained heat principle. Therefore I get an oven that can be up to heat in 50 minutes, and uses the minimum amount of wood. Heat is retained in the fire, and it cools down quite rapidly after cooking. The oven is only designed for pizzas and I also do coffee beans in it.

So thats where I am now, and I am very happy with the results.

I had a look at your website and it was very interesting. I might purchase some products from you in the future.

John
Reply With Quote
  #14  
Old 08-01-2010, 04:47 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,698
Default Re: Rammed earth base.

If you intend to make the clay permanent by firing you need to get it over. 573 C This is called quartz inversion and renders the clay permanent, ie it will not return to mud when wet. Vitrification is an entirely different process which renders the clay body non porous and usually takes place well over1200 C, depending on what fluxes are present. You might get your oven a tad over 500 C but 573 is doubtful although I'm sure some of the surface clay would reach this temp. All kinds of things happen at around these temps and potters always take this stage slow and controlled, something that is almost impossible in a WFO. I don't think it is worth the effort. You are more likely to create sets cracks in the structure.
Reply With Quote
  #15  
Old 08-01-2010, 04:48 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,698
Default Re: Rammed earth base.

Sorry set cracks should read stress cracks.
Reply With Quote
Reply

Tags
clay wfo, rammed earth

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
Deciding on a Base Allen Newbie Forum 16 12-15-2010 01:10 AM
Earth Oven Completed stellawood Other Oven Types 2 05-10-2009 10:46 AM
opinions on strength requirement of base Capt. Toddy Tools, Tips and Techniques 3 01-22-2009 01:30 PM
Basic questions on building base / installing Toscana 90 giambra Newbie Forum 1 11-04-2008 05:28 PM
ovens and earth bag construction Annie Getting Started 19 07-09-2008 07:25 AM


All times are GMT -7. The time now is 03:48 AM.

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