According to the Batman (DC Extended Universe) page, this feat is Small Building Level but I wish to calculate it by myself.
This feat can be found here.
Superman's leg: 60 px = 60 cm
Pillar length: 75 px = 75 cm
Method 1[]
I'm gonna assume it's a cube for simplicity reasons.
75^3*4 = 10 125 000
Using the fragmentation of concrete (6 J/cc):
60 750 000 Joules, Small Building level
Using the violent fragmentation of concrete (20 J/cc): 202 500 000, Small Building level
Method 2 (EDIT)[]
I'm gonna assume it's a cylinder. (see comments)
3.14*37.5^2*75*4 = 1 324 687.5 cc
Using the fragmentation of concrete (6 J/cc)
7 948 125 Joules, Wall Level
Using the violent fragmentation of concrete (20 J/cc)
26 493 750, Small Building level