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Cement
Jan 26, 2015 7:32:00 GMT
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Post by my2girls on Jan 26, 2015 7:32:00 GMT
Hi all A question !!! I work on a building site and can have as much ready mixed darbo as I want . I have read about the homebrew mix but is there a way I can use the ready mix I can get from work and add the lime , fire clay and vermiculite ? Has anyone done this ? I'm trying to save where I can you see by using wat I can for free ! Thanks in advance Mark
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simon
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Posts: 33
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Cement
Jan 26, 2015 12:29:37 GMT
Post by simon on Jan 26, 2015 12:29:37 GMT
Do you mean the tubs of mortar? I've only used them a few times, and I think you have options of retardants, and it will probably have plasticiser as well. I don't imagine that these would matter though.
So I'd say go for it, although the home brew mix does not contain vermiculite! It's sand, cement, lime, fireclay, and of course water.
The only problem might be the strength of mortar you are 'liberating', so for normal above ground mortar you'll also have to add cement to get the ratio that most users work to. Expect the ready mix to be about 6:1 sand cement, I've seen ratio of 3:1:1:1 most commonly quoted for the home brew.
You'll have to work out how much extra cement, add that, then twice as much lime, and twice as much fireclay.
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Cement
Jan 26, 2015 13:40:14 GMT
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Post by my2girls on Jan 26, 2015 13:40:14 GMT
The mortar on site is in a silo and I can take it mixed with water or dry ( I will take it dry and mix at home )
The mix in the silo is 6:1
Wat mix would you advise I use ?
As for the vermiculite , I was getting a little confused Thanks
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Cement
Jan 27, 2015 3:27:20 GMT
Post by cobblerdave on Jan 27, 2015 3:27:20 GMT
G'day ukwoodfiredovenforum.proboards.com/thread/2043/homebrew-fire-proof-mortar-ovensIs a bit on how homebrew mortar works. The 3:1:1:1 mix is a bit low on the sand. That 6 to 1 should turn out alright with the addition of 1 part hydrated lime ( it get harder in the higher temps) Don't know about clay though, it's probably got some already or a plasticizer of some description. If you can get some from work that's a bonus you always find there's bags of mortar ingredients left over. You can always use that mix again with lime as a render too. Regards dave
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Cement
Jan 27, 2015 4:23:41 GMT
Post by cobblerdave on Jan 27, 2015 4:23:41 GMT
G'day Sorry forgot about the vermiculite/ pearlite. Its mixed with strait Portland cement. No sand as it degrades the insulation value. 1:5 as the hearth insulation at 100 mm thick 1:8 as the dome insulation at 100 mm thick Regards dave
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Cement
Jan 27, 2015 7:33:54 GMT
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Post by my2girls on Jan 27, 2015 7:33:54 GMT
Thanks for the info very usefull thanks
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simon
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Posts: 33
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Cement
Jan 27, 2015 16:06:34 GMT
Post by simon on Jan 27, 2015 16:06:34 GMT
You typically won't have any clay in the mortar mix. I've seen a number of posts from Australians talking about mason's or bricklaying sand that has clay mixed in, but this is not something I've seen in the UK.
Although exactly what's in a silo I honestly couldn't say. There may be lime in it already, you might want to check. Only used it once, and that was also liberated from a site (by the home owner we were working for). It made nice mortar. In loose form it was incredibly dusty (fine dust), so I recommend you use some kind of mask when using.
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Cement
Jan 27, 2015 18:24:12 GMT
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Post by my2girls on Jan 27, 2015 18:24:12 GMT
Hi Simon
I think you right about the lime in it , on the silo it says Tarmac , no1 in lime mortar , so I will need to investorgate !
It is extremely fine, yes
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Cement
Jan 27, 2015 21:52:09 GMT
Post by kstronach on Jan 27, 2015 21:52:09 GMT
i would add more lime as dave suggested 1 part, most folk also add fireclay to the mix, i didn't bother my ovens fine 2 years on
keith
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Cement
Jan 28, 2015 18:56:11 GMT
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Post by my2girls on Jan 28, 2015 18:56:11 GMT
Hi Keith , Wat was the mix you used then ?
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Cement
Jan 28, 2015 21:53:24 GMT
Post by kstronach on Jan 28, 2015 21:53:24 GMT
i can't remember exactly but it was something along the lines of 4-1-1-1 (4 silica sand, 1 sharp sand, 1 lime, 1 cement and feb) i used silica sand as i'm sure i read somewhere it was better at handling higher temperatures
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Post by steve14 on Aug 26, 2015 8:39:12 GMT
Is there a mix of cement for the brick building that can be bought where water can just be added? Just to make life easier and ensure the mix is correct.
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simon
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Posts: 33
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Cement
Aug 26, 2015 11:43:24 GMT
Post by simon on Aug 26, 2015 11:43:24 GMT
Is there a mix of cement for the brick building that can be bought where water can just be added? Just to make life easier and ensure the mix is correct. If you mean the regular brickwork (ie not the firebricks) then if it's out there it will probably be an expensive way to buy. Simply use a container to measure out to keep the colour (and strength) consistent. If you mean the firebricks, there is "Vitcas outdoor oven cement".
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