Why are pieces of stones used to cover the ground at electric switchyards instead of just having a concrete floor ?

Question

Why are pieces of stones used to cover the ground at electric switchyards instead of just having a concrete floor ?

In: 4541

Answer 1

Also, concrete needs a grid of rebar to keep it from collapsing under its own weight and cracking/ shifting. I can’t imagine that being a good thing at an electrical switchyard..