3000 psi
By using IS code(456-2000) for reinforced cement concrete.
It is the length of the main bar provided at the column beam junction or column footing junction to allow for the development of stresses to its design strength.
The minimum covering of reinforcement for roof slab is 30mm
Stihl web page lists minimum as 110 lbs of compression
It is the distance between two points of maximum compression (or minimum compression).
25kg to 50kg /m3 of concrete
10 psi
maximum spacing assording to IS 456 = 300mm
120 psi minimum
40 times diameter
The amount of steel required in concrete as reinforcement is measured using a formula that calculates the amount of pressure that will be put on the concrete. There are different formulas to identify the minimum and the maximum amount of needed steel, depending on if you are making a beam, slab, or column.
It should have a minimum of 70 psi.