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  #71  
Old 10-12-2013, 07:21 AM
Apprentice
 
Join Date: Sep 2013
Location: Brisbane Australia
Posts: 127
Default Re: New 36inch castable build in Brisbane

More photos,
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New 36inch castable build in Brisbane-dsc01754.jpg   New 36inch castable build in Brisbane-dsc01757.jpg   New 36inch castable build in Brisbane-dsc01759.jpg  
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  #72  
Old 10-12-2013, 02:28 PM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,878
Default Re: New 36inch castable build in Brisbane

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Originally Posted by david s View Post
Brissie,
Just had a second thought since you were asking about temp in the entry.
My heartbreak is actually between the flue gallery and the outer decorative arch. In that position vermicrete holds up ok , however if you put it between the dome and the flue gallery it is considerably hotter there. If it were me doing a vermicrete mix there I'd use some castable with the aggregate sieved out of it to mix with the vermiculite rather than using a Portland cement mix.
Dave
This area gets pretty hot. It will be hot enough to destroy Portland cement, use the sifted castable.For the mix between the entry and the outer decorative arch, Portland and vermiculite is ok.
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  #73  
Old 10-12-2013, 04:53 PM
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Join Date: Sep 2013
Location: Brisbane Australia
Posts: 127
Default Re: New 36inch castable build in Brisbane

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Originally Posted by david s View Post
This area gets pretty hot. It will be hot enough to destroy Portland cement, use the sifted castable.For the mix between the entry and the outer decorative arch, Portland and vermiculite is ok.
Thanks for the reminder David s,

I was planning on implementing your good advice. I didn't bother with the lower part of first heat break on the floor. If the cement burns away it will still have the vermiculite in place as an insulator.
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  #74  
Old 10-13-2013, 03:59 AM
Apprentice
 
Join Date: Sep 2013
Location: Brisbane Australia
Posts: 127
Default Re: New 36inch castable build in Brisbane

Filled the hole it the dome wit castable, and first heat break with 5:1 vermiculite sieved castable. I also covered this with a layer of standard 5:1 vermiculite and Portland cement. You can see the expansion joint in the photos.

I also completed the arch.
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New 36inch castable build in Brisbane-dsc01763.jpg   New 36inch castable build in Brisbane-dsc01764.jpg   New 36inch castable build in Brisbane-dsc01766.jpg   New 36inch castable build in Brisbane-dsc01771.jpg   New 36inch castable build in Brisbane-dsc01775.jpg  

New 36inch castable build in Brisbane-dsc01768.jpg  

Last edited by brissie; 10-13-2013 at 04:10 AM.
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  #75  
Old 10-13-2013, 05:34 AM
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Join Date: Jun 2007
Location: South Carolina,USA
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Default Re: New 36inch castable build in Brisbane

I'm not sure if you are leaving the backer rod in place, but if you do, it will melt. Ceramic rope works well as expansion gasket,and you can slurry paint it to encapsulate the fibers. Looking good..this has got me interested in casting a dome.
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  #76  
Old 10-13-2013, 06:26 AM
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Join Date: Sep 2013
Location: Brisbane Australia
Posts: 127
Default Re: New 36inch castable build in Brisbane

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Originally Posted by stonecutter View Post
I'm not sure if you are leaving the backer rod in place, but if you do, it will melt. Ceramic rope works well as expansion gasket,and you can slurry paint it to encapsulate the fibers. Looking good..this has got me interested in casting a dome.
No the rubber is out, The ceramic rope sounds good if you can protect the fibres. Can't seam to find ceramic rope in Aus, haven't looked to hard though. Fibre glass rope is available, the temperature rating is 500 C, 1000 F. Not sure if 500 C temp would be good enough, with heat going up the flue.
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  #77  
Old 10-13-2013, 06:33 AM
Il Pizzaiolo
 
Join Date: Jan 2012
Location: Australia
Posts: 1,053
Default Re: New 36inch castable build in Brisbane

There's a few places in Melbourne that do Google ceramic and refractory Victoria.
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  #78  
Old 10-13-2013, 11:51 PM
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Join Date: Mar 2009
Location: Whittlesea
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Default Re: New 36inch castable build in Brisbane

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Originally Posted by brissie View Post
Fibre glass rope is available,
I melted some on my oven entry....
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  #79  
Old 10-22-2013, 06:42 PM
Laborer
 
Join Date: Oct 2013
Location: sydney
Posts: 95
Default Re: New 36inch castable build in Brisbane

This is a very interesting build brissie,keep up the great work.
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  #80  
Old 10-23-2013, 07:14 AM
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Join Date: Sep 2013
Location: Brisbane Australia
Posts: 127
Default Re: New 36inch castable build in Brisbane

Decided to add extra thickness to the insulation. I used a box of 6.2M * 600* 25mm ceramic fibre, that worked out as 50mm over most of the dome, and 100mm of 10:1 Vermiculite over the fibre. I added concrete supports on the two sides. Galvanised screws into the hebel and concrete help support the extra dome width.

A screed pivot rod fits into a dimple in the castable. It was slightly out of centre, so needed to bend the rod to centre it.

Photos below.
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New 36inch castable build in Brisbane-dsc01780.jpg   New 36inch castable build in Brisbane-dsc01784.jpg   New 36inch castable build in Brisbane-dsc01785.jpg   New 36inch castable build in Brisbane-dsc01787.jpg  
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