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The density of concrete is 2400 kg / m3.
A 40 pound bag of concrete plus water probably weighs about 60 pounds I would guess.
60 pounds = 27 Kg.
Volume = Mass / Density.
= 27 Kg / 2400 kg / m3
=0.01125 m3.
1 m3 = 1.308 yd3
Therefore, 0.01125 m3 = 0.014715 yd3
1 yd3 = 27 ft3
= 0.4 Ft3 (not much)
= a piece of concrete 12" wide x 12" long x 4.8 inches deep.
Cheers.
Keep in mind, Concrete doesn't "dry", it cures. It's a chemical reaction between the water and the cement. The mass of the water becomes part of the mass of the concrete. The water does not evapourate (well a bit of it does).
Concrete will harden under water even.
Once you mix it, it hardens.
If you ever need to retard the rate at which concrete cures, you can just add sugar believe it or not.
Last edited by james t kirk; 04-09-2004 at 07:21 PM..
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