You will require 111.6 imperial tons.
As a rule of thumb, 0.112 tons of asphalt (2" thick) will cover 1 square yard or 9 square feet. Thus 1 tone of asphalt (2" thick) will cover 8.93 square yards or 80.36 square feet. ------------------------------- Another (possibly more accurate) way of doing this is to use standards 1 ton [long, UK] = 2240 pounds Density of compacted Asphalt = 147 pounds per cubic foot (1728 cubic inches) 12 inches times 12 inches times 2 inches = 288 cubic inches Thus the weight of 288 cubic inches of compacted asphalt will be (288/1728)* 147 = 24.5 pounds. Therefore a tone of asphalt will cover 2240/24.5 = 91.43 square feet to a depth of 2 inches.
Calculate the volume of mix needed by multiplying 20x20x9. This gives cubic inches. Then divide that answer by 144 cubic inches per cubic foot, and you have the volume in cubic feet. A cubic foot of asphalt is a different weight depending on the weight of the rock in contains, but let's 158 pound of asphalt hotmix per cubic foot. Multiply the volume in cubic feet, above, by 158lbs, and you have the weight of mix per 20x20x9. Divide the answer by 2000 to convert to tons. Divide the tonnage by the weight per cubic feet calculated above in the second paragraph.
The answer depends on how deep you want the asphalt layer to be!
Multiply 47 inches by 32 inches to find the square inches: 47 X 32 = 1504 square inches.
217,000 square inches.
As a rule of thumb, 0.112 tons of asphalt (2" thick) will cover 1 square yard or 9 square feet. Thus 1 tone of asphalt (2" thick) will cover 8.93 square yards or 80.36 square feet. ------------------------------- Another (possibly more accurate) way of doing this is to use standards 1 ton [long, UK] = 2240 pounds Density of compacted Asphalt = 147 pounds per cubic foot (1728 cubic inches) 12 inches times 12 inches times 2 inches = 288 cubic inches Thus the weight of 288 cubic inches of compacted asphalt will be (288/1728)* 147 = 24.5 pounds. Therefore a tone of asphalt will cover 2240/24.5 = 91.43 square feet to a depth of 2 inches.
36 tonnes
The amount of square feet in a ton of asphalt will depend on the thickness of the asphalt. If the asphalt is three inches thick it will have to cover the area three times. The type of asphalt used is also a factor towards weight.
You have not said what substance you are using a ton of to cover the asphalt.
You needed to specify to what depth the asphalt is being laid.
Approximately 721 Kg/CuM or 1586 pounds per cubic meter or 121 pounds per cubic foot or 20 pounds per square foot of 2". This IS crushed Asphalt. There or various types. source- http://www.contractortalk.com/f83/weight-asphalt-46232/ so one ton of asphalt would make 100 square feet of 2" thick pavement.
Inches of water x 0.03613 equals pounds per square inch (psi).
You will need 200 cubic feet.
12" x 8" = 96 square inches
Approximately 16.33 square feet.
144
184.08 square feet is needed.