They are rebuilding a concrete highway next to my house. A thing I thought was really interesting is that they broke up the old concrete (which surprising to m

They are rebuilding a concrete highway next to my house. A thing I thought was really interesting is that they broke up the old concrete (which surprising to me had no rebar in it), and then ran it through a rock crusher and used all that rock to build up the road bed and I assume also used as aggregate in the new concrete they put down. I thought that was neat because I've read a bunch of places that old concrete isn't really ever re-used for anything.