#41  
Old 08-17-2011, 09:52 PM
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Default Re: Jake's In Mass (Started July 3, 2011)

Oh, and that was all mixed about 5:1 vermiculite to portland.
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  #42  
Old 08-17-2011, 09:57 PM
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Default Re: Jake's In Mass (Started July 3, 2011)

Next, to nerd it up. This is a picture of my lates thermocouple reader. This uses an analog/digital MUX in order to cut down on the number of very expensive MAX6675 ICs for temperature sensing.

I also dropped from an Arduino Pro to a PICAXE 14M2. This wend from about a $20 part to about a $4 part. There are definitely cheaper ways to go, but I am not an "embedded" programmer so I need at least a little hand holding and both Arduino and PICAXE are very hobbyist friendly.

I am working on redoing my schematic and board layout and will post those if anyone is interested.

What you don't see in the picture is the Bluetooth modem and the LiPo battery supply, but they are both part of the design.
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  #43  
Old 08-17-2011, 10:13 PM
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Default Re: Jake's In Mass (Started July 3, 2011)

One last note for tonight:

I ended up using 4 1/2 bags of vermiculite for the hearth That's about 18 cuft of material and my form was about 11 cuft. That is about a 60% yield/40% compaction. Not too bad I guess. I hand mixed some and machine mixed some, compaction was the same.
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  #44  
Old 08-18-2011, 04:19 PM
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Default Re: Jake's In Mass (Started July 3, 2011)

Glad you got the new phone. Keep the pictures coming!

So you used 18 cf of vermiculite and at 5:1 that means you used 3.6 cf of portland cement. By my calculations that's about 7 94# bags.
Is that right?

I'm not trying to challenging you on this, it's just that this is my next step and I have 12 cf of perlite ready to go (hopefully this weekend) with 1.5 cf of cement (3 94# bags) to fill 9 cf. Sounds like I need to plan to mix it all together and use as much as I can - and hope I have enough. Worst case is I'll leave a 'hole' in the middle and fill it in when I get more perlite and cement.

Thanks,
-jeff
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  #45  
Old 08-18-2011, 05:30 PM
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Default Re: Jake's In Mass (Started July 3, 2011)

Jeff - Be careful of the portland, 1 94# bag is 1 cubic foot the way I understand it.

Leigh
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  #46  
Old 08-18-2011, 07:11 PM
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Default Re: Jake's In Mass (Started July 3, 2011)

When I checked the density, it's about 198#/cubic foot.
The bags are also about the same size the 80# concrete mix, which is about 0.59 cubic feet.

So how many bags of cement did you wind up using?
In any case, it looks great.

I hope a few other people will weigh in on this.

-jeff
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  #47  
Old 08-18-2011, 07:29 PM
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Default Re: Jake's In Mass (Started July 3, 2011)

I did an insulation layer of vermicrete 4.5 inches thick. The calculations showed I would need 8.5 cuft. I ended up needing 10 cuft of vermiculite and (2) 94# bags of portland which gave me a 5:1 mix.

Leigh
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  #48  
Old 08-18-2011, 07:44 PM
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Default Re: Jake's In Mass (Started July 3, 2011)

Leigh
Thanks for the timely input. Maybe I'm being too technical in my thinking, but I would have thought yours was a 10:1 (assuming 1 94# bag is 0.5 cubic feet).
-jeff

Last edited by PizzaIdiot; 08-19-2011 at 05:09 AM. Reason: clarification
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  #49  
Old 08-19-2011, 08:35 AM
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Default Re: Jake's In Mass (Started July 3, 2011)

So, I also took a 94# bag of portland to be 1 cuft. A 80lb bag of ready mix is .66cuft, the 94 lb bag is slightly larger.

So, for each 20# bag of vermiculite, about 4.4 CUFT each, I use a little less than 1 bag of portland cement. That gave me somewhere between 4:1 and 5:1 at 5" thick.

Overall the mix looked just about right, it is strong, but airy.
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  #50  
Old 08-19-2011, 08:38 AM
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Default Re: Jake's In Mass (Started July 3, 2011)

Also googling around, Dan the brick Man says....
"a bag of portland cement is exactly 1 cu. ft. ...to this you would add 2 cu. ft. of sand and 3 cu. ft. of gravel... a six bag mix of concrete (3500 psi mix) would contain 6 bags of portland...so roughly 1/6th of a cu yd..."
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