A square foot of concrete has no weight because a square foot has no thickness. A cubic foot of concrete would weigh 65 Kg (143 lb) If you ASSUMED that concrete driveways, paths, etc. are all the same thickness , which they are NOT, then let us say they are 4 inch thick (10cm) In that case, then 1Square Ft of Concrete would weigh one third of the figure given above. Therefore it weighs 48 lb which is the same as 22 Kg.. Density of Concrete is 34.4 gram per cubic Inch or 1.216 ounce per cubic inch. (since you seem to be wanting to use Imperial measure)
Most bags will make a 1/3 of a cubic foot of concrete.
One square foot is 144 square inches. If you want a specific conversion ask for which units.
Is the concrete filled with pebble or lightweight foam? This is really an impossible question. Not enough data.
They are 9 and 16
None. A square foot is a measure of area whereas a foot is a measure of length or distance. The two measure different things and it makes no sense to try to convert from one to the other.
The average weight of concrete is 150 lb per cubic foot. However, lightweight concrete can weigh as little as 50 lb/ft3 and special mix designs (like those used in nuclear power plants) can weigh up to 400 lb/ft3.
You can assume 50lbs/square foot for a one story pier/beam house with the attached fixtures not the owners posessions. You will need to go to 350 lbs/square foot for a concrete slab foundation. Be sure to add safety factors.
One ton
2500 Kg
A concrete foot generally must extend one foot below the frost line. in some cases it may have to be more or less.
ONE I THINK, SINCE THERE ARE 27 CUBIC FEET IN A CUBIC YARD OF CONCRETE (WHICH MEASURES 3 FEET BY 3 FEET BY 3 FEET).