If you know of current building projects, see if you can't check out the construction site firsthand.
Any construction site can leave concrete chunks, hard-packed dirt, and other problems behind.
Pre-cast concrete walls: These are pre-fabricated and delivered to the construction site.
One of the few times it's probably best to not wear a tie is at a workplace such as a construction site where everyone works on difficult and dirty tasks, and wearing a tie might even be dangerous.
Wearing dress clothes to a construction site would actually be considered inappropriate.