Concrete can be considered low environmental impact if it uses recycled aggregate. And it can of course be crushed & recycled & used all over again.
Recycled aggregate is rare. I don’t know of any concrete plant that uses it. Although I do know of recycled asphalt in use. And of course to recycle concrete you have to rip it up, transport it, crush it, grade it, transport it again, mix it, and then transport it again
We do stock recycled concrete in our yard, but it’s only used as bulk fill or sub-base