sonotube fill

Old 09-20-15, 06:32 PM
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sonotube fill

how much cement to fill an 18 inch sonotube 5 ft long with rebar in it??
I was wanting to do it by bags if possible...
Old 09-20-15, 06:57 PM
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The formula is V=πr2h. I love querty keyboards V=3.14 x.75(squared) x5 or 8.8 cu ft. 15 each 80 lb bags of sackrete per hole. What volume does your rebar take up?

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Old 09-21-15, 03:15 AM
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volume = radius squared ( that's radius multiplied by radius ) X pi ( that's 3.14159 + much more----- ) X 5',,, ea 80#b has its volume printed on it,,, i expect you'll leave more in the wheelbarrow after mixing than displaced by rebar,,, trying to be tactful here - conc's only $4 per 80#b or, in your case, roughly $53.00 - cylinder volume was 7th grade geometry in my day + its easily avail on the i-net if you use google or, probably, ANY other search engine,,, best of luck ! enjoy your day ! happy to help !
Old 09-21-15, 05:56 PM
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here's a site with a little script on it which will calculate yards needed to fill a particular size/shape.

conversion from yards to bags should be simpler, and will depend on how you're making your concrete.

Volume Calculator - Sonoco Construction Products

this is such a simple calculation, it seems weird to me that some version of it isn't just printed on the sonotube itself, missed opportunity for marketing there.
Old 09-21-15, 06:50 PM
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I love querty keyboards
That's "qwerty". Just like it appears on the keyboard.
Old 09-22-15, 09:37 AM
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So simple, a typical 4th-grader could do it.

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