#21  
Old 02-21-2009, 12:44 PM
david s's Avatar
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Location: Townsville, Nth Queensland,Australia
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Default Re: Mini Portable Beginnings

The reason steel and concrete work well together is because they expand at the same rate. The high temp may cause problems with the zinc coating on galv. Try using stainless steel reinforcing needles as an alternative.
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  #22  
Old 02-24-2009, 06:35 AM
Serf
 
Join Date: Feb 2009
Location: St Joe Island
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Default Re: Mini Portable Beginnings

Hey sbinder. do you have an estimate of the weight of the finished unit?
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  #23  
Old 02-24-2009, 10:15 AM
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Join Date: Nov 2008
Location: Ohio
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Default Re: Mini Portable Beginnings

I don't have an estimate. I'm guessing somewhere around 3,000 lb but that is just a wild guess. My base is 800 lb already and then with another 1500 lbs of brick...
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  #24  
Old 02-25-2009, 07:43 AM
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Default Re: Mini Portable Beginnings

David,

Thanks for the feedback on the reinforcement ideas. I had talked to a guy that sells the SS pins and he didn't feel that it would help very much. I do like the idea of the chicken wire and plan to go with that approach, especially since you have already proven that it will work.
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  #25  
Old 02-25-2009, 12:16 PM
david s's Avatar
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Default Re: Mini Portable Beginnings

Binder,
The brew I refered to was over the inner dome. On the outer shell I used a 4:1:1 sand/ lime Portland cement render and again used fine chicken wire of overlapping pieces. This shell is only 10mm thick. Again I was concerned to keep the weight down. This outer shell is like a ferrocement boat. I read somewhere that if you want it stronger you use more mesh rather than more cement. The shell is finished with about 2mm of acrylic render, but this should only be applied after ALL moisture has been eliminated.Hope this helps.
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  #26  
Old 02-27-2009, 11:06 AM
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Join Date: Nov 2008
Location: Ohio
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Default Re: Mini Portable Beginnings

Well I have the first two rows done and started on the third. Slow but sure.
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Mini Portable Beginnings-oven5.jpg   Mini Portable Beginnings-oven6.jpg  
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  #27  
Old 03-10-2009, 01:18 PM
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Join Date: Nov 2008
Location: Ohio
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Default Re: Mini Portable Beginnings

A little more progress to report. Soon I will be ready to go over the doorway. I'm also making plans for the 6" SuperVent Chimney.
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  #28  
Old 03-20-2009, 11:07 AM
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Join Date: Nov 2008
Location: Ohio
Posts: 15
Default Re: Mini Portable Beginnings

I thought it was time to add a couple more pictures. This is going slow but sure. I'm happy because the next row will go all the way around instead of having to stop for the door.
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Mini Portable Beginnings-dsc01452.jpg   Mini Portable Beginnings-dsc01453.jpg  
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  #29  
Old 04-02-2009, 11:45 AM
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Join Date: Nov 2008
Location: Ohio
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Default Re: Mini Portable Beginnings

I've got a few more rows added. I think I will wait to add the rest of the fill in morter until I can add chicken wire in for reinforcement as has been suggested by various members of this forum.
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  #30  
Old 04-17-2009, 02:18 AM
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Join Date: Jul 2007
Location: Nottingham
Posts: 66
Default Re: Mini Portable Beginnings

Quote:
Originally Posted by david s View Post
The reason steel and concrete work well together is because they expand at the same rate. The high temp may cause problems with the zinc coating on galv. Try using stainless steel reinforcing needles as an alternative.
Another alternative is to use glass fibre reinforcing - its a bit like chopped strand mat without the binder, and is just blended through the mortar mix.

Cheers

Pete
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