#11  
Old 12-19-2013, 09:13 PM
Journeyman
 
Join Date: May 2011
Location: South Australia
Posts: 468
Default Re: Agricultural lime in home brew

Here comes another long winded reply.

Quote:
Originally Posted by skywalker View Post
I have noticed a that my homebrew is not very strong. When I installed the chimney on the anchor plate, the bricks that the anchor is screwed onto came loose. So I had to glue them back together with high heat cement. Hopefully I did a good enough job with the brick work in the dome and it truly is self supporting.

That's interesting. One of the guys on this forum (TXCraig? Tscarborough? can't remember) pointed out that the stronger the mortar, the weaker the bond between the mortar and the brick. So, if your bricks pulled away, either the mortar is strong or it was still "green" maybe.
Anyway, lots of bricklayers will tell you that the real job of the mortar is to keep the bricks apart and allow for minor differences in size and shape.
So, if you can imagine, in your oven, as long as the mortar is strong enough to not crumble and collapse, it is just another masonry unit, that is perfectly fitted to fill the gap between the bricks , if that makes sense. So if your mortar doesn't crumble back to dust, the oven consists of a heap of blocks, some brick, some mortar, that fit together perfectly. So well, it doesn't matter much if they aren't actually glued together.
Also, I'm assuming you have vermicrete over the outside? So the whole thing is encased in a block of concrete foam and the bricks can't slide anywhere?
It's gunna take a lot for this thing to fall down, bro.
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  #12  
Old 12-19-2013, 09:28 PM
Serf
 
Join Date: Oct 2013
Location: Apex, NC
Posts: 6
Default Re: Agricultural lime in home brew

That makes a lot of sense. I wouldnt glue bricks on the inside. But the ones that came loose (because of me over -tightening the chimney to the anchor plate) are holding the chimney in place so those have to stay put.

No vermicrete, just 3" of ceramic fiber, 1" of stucco and a layer of acrylic reinforced surface bonding cement. I guess the bricks have a little bit of wiggle room in there because of the blanket, but man I think it would take an earthquake to move them...
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