There are too many variables that are not quantified in the question to answer this. What kind of concrete? (There are different kinds.) Is the concrete reinforced? How is the square of concrete supported? What is the nature of the load and how is it distributed on the slab? We could go on.
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It is all dependant on how thick the concrete is. You take the square footage and turn that into cubed feet (where the thickness comes in) if its 1" thick you multiply the square footage by.083, if its 2" thick you multiply by.17. To come up with this number you take the thickness say 3" and divide that by 12 (12 inches in a foot), so for 3 inches you get .25. So back to the question at hand, say your 30 square feet of concrete is 6 inches thick, your equation would look like this: 30 X .5 = 15. So 15 is your cubed footage. You then multiply this number by 150 which is the weight in pounds of 1 cubic foot of concrete. The number you come up with is 2,250. That is the amount in pounds of your 30 square feet of concrete assuming it is 6 inches thick.
By the yard ... 4" thick and an area 3' by 3' square.
we can weight one sheet and calculate the unit weight we can weight one sheet and calculate the unit weight
Depends on how thick the concrete pad is. At 4 inches thick and allowing for a little waste and imprecise measurements, about 350 square feet. You can check out more options with the concrete calculator below.
Concrete is sold in cubic (volume) measurements not square (area) measurements.
157 pounds
Approximately 800 Newtons.
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This question can not be answered because square feet are a measure of area and a cubic meter is a measure of volume.
100 mmm = 0.100 meter 28 x .1 = 2.8 cubic meters
It depends on how thick you want the concrete.
GSM means grams per square meter in measurement. It is the measure of the weight and type
That depends on how thin you spread it. If it's a meter thick, it only covers one square meter. If it's a centimeter thick, it covers a hundred square meters.
How thick is it
27 square feet at 1 f thick
It is 0.03 cubic metres, so would be about 0.03 x 5000 kilograms, 150 kg.