around twenty kgs
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Concrete weighs about 150#'s per cubic foot. Given that your measurements are 2'x2'x4', the block contains about 16 cubic feet. 16 cubic feet of concrete at 150#'s is about 2400#'s per block.
29 lb
The standard 6 by 8 by 16 cinder block weighs 28 pounds. They have a compression strength of 1900 psi.
8 inch x 16 inch concrete block is actually 2/3 foot x 4/3 foot block Area of one block is 2/3 x 4/3 = 8/9 square feet Number of blocks in 310 square feet = (310)/(8/9) = (310) x (9/8) = 155 x 9/4 which is 1395/4 = 348.75 blocks
There are 128 square inches in 8x16 inches. There are 144 square inches in a square foot. So, the side of an 8 x 16 block is a little smaller than a square foot. There are 0.89 square feet in the side of a 8 x 16 block