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To determine how many 60-pound bags of sand are needed for 4 yards, first convert yards to pounds. One cubic yard of sand weighs approximately 1,000 to 1,200 pounds, depending on the type of sand. Assuming an average weight of 1,000 pounds per yard, 4 yards would weigh around 4,000 pounds. Dividing 4,000 pounds by 60 pounds per bag gives you about 67 bags of sand needed.
To determine how many bags of sand are needed to make 1 cubic yard, you first need to know the size of the sand bag. A standard bag of sand typically contains 0.5 cubic feet. Since there are 27 cubic feet in a cubic yard, you would need 54 bags of sand (27 cubic feet divided by 0.5 cubic feet per bag) to make 1 cubic yard.
are these concrete blocks and allowing for mortar. 12.5 per square metre, 62.5 per cubic metre with mortar
11 bags
7 bags per 1000 on mortar mix and half a truckload of "mortar" sand aught to do it.
65 BLOCKS PER 74 POUND OF MORTAR (THAT YOU ADD SAND TO) 80 POUND PREMIX MORTAR JUST ADD WATER 27 BLOCK 8X8X16
it is 100 bags of sand/ballast
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I'll use the density of dry, packed sand, which is 100 lbs per cubic foot, 50/100 is 2 50 lb bags of sand
To determine how many bags of sand are needed to make 1 cubic yard, you first need to know the size of the sand bag. A standard bag of sand typically contains 0.5 cubic feet. Since there are 27 cubic feet in a cubic yard, you would need 54 bags of sand (27 cubic feet divided by 0.5 cubic feet per bag) to make 1 cubic yard.
are these concrete blocks and allowing for mortar. 12.5 per square metre, 62.5 per cubic metre with mortar
The volume of sand weighs 455x 2/12 *100 pounds per cubic foot = 7600 pounds so you need about 152 bags.
11 bags
If a 20kg bag of cement=0.1m3 with 100 lots o 0.01 to 1m3 then you will need 12.5 bags per m3. So you need approx 11.5m3 of sand and 144 bags of cement (144 x 0.01 = 1.44m3) to give you a total of 12.94m3
About two bags per square foot.
not a lot. but assuming 9"x3" and using this brick calculator it works out at 0.0003 cubic meters of mortar or 0.91kg of sand and 0.25kg of cement per brick.