3000 psi. with 3/4 rock should do it . but you could go higher psi which would be over kill.
4 quarts approx.
PSI = Pounds per Square Inch. Bar - is one atmosphere (14 PSI)
A 6 X 12 will hold more weight than a 4 X 8 of the same material because there is more surface area. Concrete strength is measured in psi, so a larger cylinder = more square inches = more pounds.
27 cubic feet okay from hayesconcrete.com 81 sq ft is= 4 inches 54 sg ft is = 6 inches
4&1/2 sack type 1 type 2 mix is quite standard in the industry but 5 sack mix is very common also. the higher the sack mix the greater the concrete breaking strength.
3000 psi. with 3/4 rock should do it . but you could go higher psi which would be over kill.
Between $4-$8
4 grams. hence the name 40 sack (assuming the bud is $10 per g.)
4
.4 psi
800lbs
96 cubic feet of concrete
About 4 tons PSI
about 2 psi. (0.5 psi / foot of depth)
Depends on the height. You gain approximately 0.4 psi for every foot of elevation; so at 10 foot elevation you will have ~4 psi.
The answer is 576.