I work in aggregates processing, and I respect my knives wayyyy too much to take them with me to the jobsite.
This post is going to end up somewhere in the middle of about ten posts advocating for some kind of Chris Reeve product, and somebody is going to come along and suggest Benchmade and Spyderco. Chances are, you've already heard these answers.
Mine is going to be unique, but boring.
Head over to the auction site and find yourself an old, American-made boxcutter. Maybe by Stanley, or even Klein, if you're feeling fancy. Leave the "nice" knives at home, because I promise that you will eventually drop it off the rafters, onto the concrete.