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How many bags of pre-mixed concrete teletubby6 09-21-2007
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Posted by Doug Miller on September 21, 2007, 7:55 am
wrote:
>4' x 4' =16 SF x .33333 = 5.33 CF x 155#/CF =826.66 lbs / 60# per
>bag = 13.77 bags by my calculations.

That 155 pounds per cubic foot includes the water, thus leading you to
overestimate the amount of dry mix needed. I put it at 11 bags.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.

Posted by Doug Miller on September 21, 2007, 7:53 am
wrote:
>How many 60lb bags of pre-mixed concrete will I need to make a 4 foot
>by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I only
>found one web based calculator and it said I need almost 40 bags. That
>cant be right.

No, it's not. An 80# bag will make about 2/3 cubic foot of concrete when
mixed. You need 4' x 4' x 1/3' = 5-1/3 cu ft; divide that by 2/3, and you get
eight **80** pound bags, or eleven 60-pound bags. I'd get one more, to be on
the safe side.

> Heck, the bags are close to 4 inches thick

Measure one, and you'll find it's a lot closer to 2-1/2".

> and they
>are larger than a square foot.

And it takes up *less* space after you mix in the water.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.

Posted by Steve Barker LT on September 21, 2007, 8:28 am
12 according to this: http://www.quikrete.com/Calculator/Main.asp


steve

> How many 60lb bags of pre-mixed concrete will I need to make a 4 foot
> by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I only
> found one web based calculator and it said I need almost 40 bags. That
> cant be right. Heck, the bags are close to 4 inches thick and they
> are larger than a square foot. Math is not my thing....
>
>



Posted by beecrofter on September 21, 2007, 10:46 am
On Sep 21, 7:24 am, teletub...@hotmail.com wrote:
> How many 60lb bags of pre-mixed concrete will I need to make a 4 foot
> by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I only
> found one web based calculator and it said I need almost 40 bags. That
> cant be right. Heck, the bags are close to 4 inches thick and they
> are larger than a square foot. Math is not my thing....

60lb=1/2cu ft


Posted by DanG on September 21, 2007, 11:55 pm
No way. A cubic foot of concrete weighs between 140 and 155
pounds.

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net



> On Sep 21, 7:24 am, teletub...@hotmail.com wrote:
>> How many 60lb bags of pre-mixed concrete will I need to make a
>> 4 foot
>> by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I
>> only
>> found one web based calculator and it said I need almost 40
>> bags. That
>> cant be right. Heck, the bags are close to 4 inches thick and
>> they
>> are larger than a square foot. Math is not my thing....
>
> 60lb=1/2cu ft
>



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