for splat maps / decals, here is an example, a gif from the game we are developing
Of course the decal would be dependent on whatever it was that damaged the concrete, but like “small chunk” and “large chunk” seems like they would cover 99.9% of uses.
For really large damage where you can’t or don’t want to use mesh destruction, it seems like something like this: Here's how to open Cracks, Fissures or Holes on the ground in Unity URP could work possibly on a concrete wall too. No glow, just shadow in there would suffice I think.