you will need about 4 cuyds for your project.
about 26.4 is the volume i think.......
24
25 feet is equal to 300 inches. The radius of a hole is half its diameter, which equals 4 inches. The volume of the cylinder is given by the formula v = [Pi]r2h, so the volume of your hole is 3.14 * 16 * 300 = 15080 cubic inches. There are 1728 cubic inches to the cubic foot, so you'll need about 8.75 cubic feet of concrete, which is about a third of a yard. (More exactly, that's a cubic yard, but concrete guys just say "yard.")
30 minutes
It takes at least 3 days to harden.
At least a month to dry and another week to harden
it takes 28 days to fully cure, It would be advisable not to drive on it before that because of micro cracks, which will continue to migrate through time, causing spiderwebbing outside of your control joints, Depends on the cement used some quick cure cements can harden in an hour
you will need about 4 cuyds for your project.
7.1
387 cubic feet. This is because 43x18x0.5 (as six inches is 1/2 of a foot) =387.
is a scinentific method
15 cubic yards
15 cubic yards
8.25 cubic yards of concrete
30.81 cubic yards
It is about 166.67 cubic feet and you will need just over 6.17 cubic yards of concrete.