That would depend on the height of the wall...
To prevent injury.
rebars
C 11 specification
There is no constant value for the ratio of the rebars and concrete volume. The rebars depends on the structural designer's safety factor and the factors affecting the framing like wind, earthquake and soil.
Middle strip
350x450mm with 12-16mm rebars on 5m span
The unit weight of 16 mm reinforcement is 1.58 kg/m
average of 0.12tons of rebars per cubic meter of concrete.
Waist slab is used in case of stairs. The rebars are bent at some angles on which steps are built.
The placement of steel reinforcing is dependent on the requirements of the strength and load-bearing of the concrete. A structural engineer should be contacted in this regard.
sir, i want to take core test for the length of 75cm in concrete if the rebars obstruct what have to do?
use 400x400mm with a rebars of 8-16mm dia. for 4-5m span.