#31  
Old 12-08-2008, 02:22 PM
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Default Re: Mark's WFO

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I have that same bucket! Now my question is what to do with the brick bits and my leftover 1/2 bricks...
I still have some of those brick pieces, a sample of the vermiculite concrete and a sample of the casting material I used for my vent on the potting bench near the oven. I call it "the museum", my wife says it is trash...
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  #32  
Old 12-08-2008, 02:27 PM
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Default Re: Mark's WFO

Mark - did you use the 5/1 mix? The fact that you only have air exposed to the top surface, I would think it will take longer than normal to dry. In regard to covering it, only if it's going to freeze or rain. I don't think the stuff is prone to crack (mine didn't anyway)

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  #33  
Old 12-08-2008, 02:34 PM
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Default Re: Mark's WFO

Les,
Thanks for the reply, I can always count on you. Yes, I used 5/1 mix. There definitely won't be a freeze, maybe a few sprinkles. Any idea on time to set up.

Mark
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  #34  
Old 12-08-2008, 02:37 PM
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Default Re: Mark's WFO

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I got the insulating layer poured today. I was surprised it took EXACTLY two bags of vermiculite. I wasn't short and had zero leftover.

Mark
I don't believe you. It's been scientifically proven to be impossible to actually buy the correct amount of any building material the first time. :-)

James
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  #35  
Old 12-08-2008, 02:37 PM
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Default Re: Mark's WFO

Les,
It took a minute to understand! I have air to ONLY the top surface, because of the way I poured. That makes sense.

Mark
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  #36  
Old 12-08-2008, 04:26 PM
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Default Re: Mark's WFO

Hi Mark,

I used the same mix; it just took a few days and really didn't shrink. It was firm but soft enough to dig into. It doesn't get hard like concrete, well at least mine didn't.

Looks like you're off to a great start!
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Old 12-08-2008, 04:54 PM
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Default Re: Mark's WFO

James,
The science still stands! It did take exactly two bags but I only bought one the first time and had to run back to HD to buy a second bag.

Mark
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  #38  
Old 12-09-2008, 03:44 AM
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Default Re: Mark's WFO

Mark i would suggest covering it and keeping it dry, the stuff is pretty porous and you don't want it getting full of water. Besides its a chemical reaction that sets it, so it doesn't really need air for it to dry.
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  #39  
Old 12-09-2008, 07:32 AM
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Default Re: Mark's WFO

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Besides its a chemical reaction that sets it, so it doesn't really need air for it to dry.
It is true that it is a chemical reaction. But in order for it to dry, the water needs to evaporate – that’s where the air comes into play. Here is a short article about the subject.

http://www.dri-eaz.com/VAULT/PR/DryingConcrete.PDF

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  #40  
Old 12-09-2008, 09:53 AM
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Default Re: Mark's WFO

Thanks guys, I have a question about my next step. How fast does the fireclay and sand mix set up. Will I have time to spread the whole floor and still make sure all the bricks are even.

Mark
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