leftturn109

i need to know how much Concrete you get from a 40 pound bag.

MSD

40 pounds




















Just kidding.
16 ft^2 @1/4" thick

kazoo

Hmmm. I've never held a 40 pound bag, but would presume I'd want to put light things in it.

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leftturn109

Ha Ha Ha Ha

Dibbler

It should say right on the bag how much you get. OR..... Look at the bag. Thats how much space the concrete is going to take up when placed. The water tends to evaporate leaving the concrete in the shape you placed it in. No more, no less....

40 pounds... That's funny....

agball

I dont know about that, I've gotten 2 pounds of shit in a one pound bag! so maybe the answer is 80 pounds?

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Fat_Boy

I don't even want to know what you were doing when you did that!

theemaan

Have to agree with Dibbler. It will be almost exactly the size of the bag-whatever shape hole you pour it in.
In Florida they take the whole bag -pile them with rebar sticking through them and make walls and culvert ends. Sorry, I'm rambling

slacker00

It depends on the type of concrete (or shall we say cement). If you grabbed a bag of ready-mix all you will need to do is add water, you will get concrete (although based on the purpose of the mix you may need to add larger aggregate (stone)).

If you grabbed a bag of cement, it is up to your mix design (water:cement:coarse aggregate:fine aggregate:air) at how much you will get. If you are interested in a standard mix design I am sure I can dig something up for you if you are in need.

Slacker00

james t kirk

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.

Vogad

..last time I looked, Readymix 40lb = 1/2 cubic foot. therefore...1.5 square feet (18"x 12") at the 4 inch thick standard...

yournamehere

I think a 40 lb. bag is 0.3 cu. ft.
a 4" slab would give you 0.9 sq. ft. (basically 11" x 11" x 4")

Read the bag - it'll give the volume.

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crfpilot

Like the others said read the bag it should give you the volume. Also make sure to read the directions on how much water to add, you don't want to have too high water/cement ratio.

pmkuon

Get some powdered Spic and Span. Mix with a little water to make a thick paste. Spread it on the spot and let it sit till it drys out. Remove it with a pressure washer and all or at least most of the stain will be gone. Repeat if necessary.

Good luck