I'm stuck on a realism thing here. One of those situations were a quizzical expression forms on my face as I consider what I just wrote. This isn't an especially high quality concrete floor. The antagonists in my story gathered around something on this floor and smashed it with sledgehammers for about half an hour. Pulping it, essentially. I'm wondering what the state of the floor would be, if it was totally flat to begin with. Would chips and gouges be noticeable, or is it not possible to inflict that kind of damage with only manned hammers? Would the handles of the hammers break long before the floor does?