how much to fill 8" sona tube?

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  #1  
Old 04-07-03, 02:55 PM
raphster
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how much to fill 8" sona tube?

how many bags of cement do I need to fill an 8"x3' sonatube that I'll use for a footing?

should I use quick set cement or regular?
 
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  #2  
Old 04-07-03, 04:00 PM
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1.04 cubic feet. If a bag is .66 cubic feet then, one and one-third bags.
 
  #3  
Old 04-08-03, 07:19 PM
pbj
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please correct me if I'm wrong, but I don't think 1.3 bags of cement will fill a 3 foot sona tube, visually the tube will take 3 bags easily.
by my calculations it will take a little more than 6 bags.

formula I used 2 x pi x Radius x Height / 144
 
  #4  
Old 04-09-03, 07:51 PM
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old guy's math check

Volume of a cylinder formula that I used. This one dates from the early 1960s, so it may be out of date.
pi times the radius squared times the height
pi*r^2*h

3.14*4^2*36=1808 cubic inches

1808 cubic inches / 1728 cubic inches per cubic foot = 1.0463 cubic feet

If a sack of mix is .66 cubic feet then it would take 1 -1/2 sacks or so, rather than 1- 1/3.

Of course, some sacks of mix have different amounts in them. I think that Quikrete makes 2/3 cf, but Sakrete is 3/4. Anyway, a label check should settle that.

Anyhow, that is the method I used.
 
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Old 04-10-03, 09:54 PM
bungalow jeff
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I'll just chime in and confirm that AREA x height equals volume as Chris stated. Pbj, you have the perimeter in your calcs.
 
  #6  
Old 04-11-03, 04:09 PM
raphster
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Sorry to cause the confusion, but I can put an end to any questions.

I just bought a 4' long sonatube that was 8" wide, according to the chart on the tube, it states that it will require:

1 50lb bag of cement per 1ft length.
4/5 of a 60lb bag of cement per 1ft length.

1 3/4 bags if using 60lb of cement per 1ft length(12" tube)
2 bags if using 50lb of cement per 1ft length(12" tube)

Thus for a 4' tube 8" wide, it will require 4 bags
 
  #7  
Old 04-11-03, 09:14 PM
bungalow jeff
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There's more confusion for you. Chfite is talking about industry standard bags of cement. The Sonotube instructions are for home center sized bags.

Raphster, I'm just glad you hot your info. I'd hate to see you looking for something to do with a lot of extra concrete. Or worse, standing next to your half-filled tube curing in the sun.

Good luck with your project.
 
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