Cement weighs about 150 punds per cubic foot, and there are 1728 cubic inches in a cubic foot, so if the block is solid then it weighs 150x8x8x12/1728 = 67 pounds
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To determine how many 8-inch concrete blocks fit in a cube, we first need to know the dimensions of the cube. Assuming a cube of 1 cubic foot (12 inches on each side), the volume is 12 x 12 x 12 = 1,728 cubic inches. Each 8-inch concrete block has a volume of 8 x 8 x 16 = 1,024 cubic inches. Dividing the cube's volume by the volume of one block, 1,728 / 1,024, results in approximately 1.6875, meaning only one 8-inch block can fit in a 1 cubic foot cube.
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Assuming they are 8 inch*16 inch blocks, 144 square feet = 144*12*12 square inches. So number of blocks required = 144*12*12/(8*16) = 162
A LOT! Gunnite is make by mixing cement, sand, and water in an approximate ratio of 1 part cement to 4-6 parts sand with 1 part water using a high pressure spraying mechanism. Please note that the major component in gunnite is SAND and not cement. With this as a guideline, a 50 pound bag of cement would be mixed with at least 200 pounds of cement (approximate total mixture weight of 250 pounds). Thus,it would require approximately 8 such mixtures to equal 2000 pounds (2000 divided by 250 = 8) and since there is one bag of cement per mixture, it would require around 8 bags or 400 pounds of cement. Furthermore, one 250 pound mixture (containing one bag of cement) will cover approximately 5 square feet at a depth of 1 inch. So, to build a pool of any decent size, you will need MANY TONS of gunnite. Hope this helps ...