What is the weight of a concrete lid that is 7ft diameter x 1ft thick?

Question

1 cubic foot of concrete weighs 150 lb.

Answer 1

Reinforced normal weight concrete weights 12.5 psf per inch of thickness. 12.5 psf x 12" =150 pcf. Sorry DOC, your stronger than you realize.
Total weight 5773#

Answer 2

Here is a link, and obviously you've done some homework, but the stats are not entirely accurate.

Assume for a moment that an 80 pound bag equates to approx. 1.5 cu. ft....Certainly add to that the minimal weight of water to create the inevitable.

http://search.yahoo.com/search?ei=utf-8&fr=slv8-msgr&p=weight%20of%20a%20cubic%20ft.%20of%20set%20concrete

Without knowing at all why you ask...I'll ask why?

Also it might also depend on any structural support added to that size to keep it intact.

Finally, and with no offense; if a cubic ft. of concrete ended up weighing 150 pounds; I would have quit pouring and manuevering years ago.

Steven Wolf

I think for an OVER THE TOP weight you might assume the diameter as a square and do the math in a square that approximates 49 sq. ft. x 1 ft.

Answer 3

The volume of the lid is pi (3.14) times the radius (3.5ft)squared times the thickness (1 ft). 3.14 X 3.5 X 3.5 X 1 = about 38.5 CuFt. Therefore, if your estimate of the weight per CuFt is correct, the lid would weigh about 5770 pounds.

Bert

Answer 4

DIY Doc is correct.... and what he meant by the structural weight to keep it intact, was is there any metal screening in the lid or re bar? This can add quite a bit to the weight

Answer 5

approx. 5800 lbs......diy doc , dont quit pouring just quit giving bad info...80 lb. bag...2/3 of a cu. ft. not 1.5...