I had some interesting thoughts while walking my dog this morning.
Let's assume there has been some catastrophic event that leaves the world habitable, but kills off a large amount of people (99% of the world population) and breaks down governments and global supply chains. All that are left are small groups of survivors that band together and might be the only people for dozens of miles.
One of these groups happens upon a subdivision and starts ripping apart houses looking for useful things (let's say they've set up in one of these houses or in a nearby area). My expectation would be that most of the contents of the house would be the first to be pillaged (food, appliances, furniture, etc), followed by the materials that made up the house (drywall, wiring, wood beams that make up the supports and walls), but I can't figure out if the concrete that makes up the foundation and driveways would be useful in any way.
Is there any good use that can be made of concrete that would be worth breaking it up and hauling it out?