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Subject Author Date
cubic feet Herb and Eneva 06-16-2007
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Posted by Herb and Eneva on June 16, 2007, 6:38 am
I`m planning on doing a small concrete job. It will be 3 12 in. wide
by 42 in.long by 4 in. thick slabs. I would like to know how many cubic
feet are in 1 80 lb. sack of ready mix. Thanx a lot


Posted by Mikepier on June 16, 2007, 7:49 am
On Jun 16, 6:38 am, hern...@webtv.net (Herb and Eneva) wrote:
> I`m planning on doing a small concrete job. It will be 3 12 in. wide
> by 42 in.long by 4 in. thick slabs. I would like to know how many cubic
> feet are in 1 80 lb. sack of ready mix. Thanx a lot

According to this calculator
http://www.quickrete.com/Calculator/Main.asp#concrete,
you would need at least 6 bags for the whole job. An 80 lb bag yields .
6 cubic feet.


Posted by Mikepier on June 16, 2007, 7:53 am
> An 80 lb bag yields .
> 6 cubic feet.

That's .6 cu ft. Forgot the decimal point.


Posted by BobK207 on June 16, 2007, 11:40 am
> > An 80 lb bag yields .
> > 6 cubic feet.
>
> That's .6 cu ft. Forgot the decimal point.

I would agree with Mike's number of .6 cu ft for an 80 lb bag

I use .44 cu ft for a 60 pound bag of "bagged concrete mix" so that
would give Mike's 80 lb bag .587 cu ft.....close enough :)


So how where does the rest of the weight per yard come from?
>>>>>>the water that gets hydrated & bonded to the cement

Dan's number of .5 cu ft per 80 bag underestimates the concrete yield
"slightly" but in small batches; waste, form volume underestimation &
form "leakage" can easily eat up that margin.

Cheers
Bob


Posted by Mikepier on June 16, 2007, 12:07 pm
> I would agree with Mike's number of .6 cu ft for an 80 lb bag
>
> I use .44 cu ft for a 60 pound bag of "bagged concrete mix" so that
> would give Mike's 80 lb bag .587 cu ft.....close enough :)

I actually got this info here on quickrete spec sheet

http://www.quickrete.com/PDFs/SPEC_DATA-ConcreteMix.pdf


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