Re: how to figure weight of concrete

Posted by John in La on June 08, 2019 at 20:21:36 from (24.158.216.181):

In Reply to: how to figure weight of concrete posted by tedregentin on June 08, 2019 at 18:23:54:

I figure it a little different.

Russ says concrete is 150 lbs per cu ft.
You want 25 lbs so that is 1/6 of a cu ft.

Now we need to figure the volume of your pipe per inch.
Radius x radius x height x pie
1.5 x 1.5 x 1 x 3.14 = 7.065
So you have 7.065 cu in per inch of pipe.

1728 cu inches in a cubic foot and you need 1/6
1728 / 6 = 288 cu inches

So you need 288 cu inches to make 25 lbs and your pipe holds 7.065 cu inches per inch.
288 / 7.065 = 40.764
So your pipe needs to be 40.764 inches long or just over 40 3/4 inches.

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