it's possible i'm misunderstanding, but you seem to be asking whether making crushed stone is more or less environmentally damaging than recycling old concrete. the answer is that neither of them results in significant environmental damage in itself, but trucking them to construction sites does
also can you elucidate which goals you meant to say were usually mutually exclusive? it isn't clear from context
also, i asked two questions in my previous comment that you haven't answered: are they offering you money for your old concrete? how much are they paying?
They are offering money. As for how much, I imagine it depends on the area. All things gravel and stone are expensive at the moment. People are getting caught stealing sand, that's the world we're in today.
it's not true that gravel, crushed stone, and sand are expensive, by most definitions of 'expensive'. they cost pennies per kilogram. yes, that's enough for people to make a profit from stealing
That it can be made into something more expensive doesn't imply that it is also environmentally sound.
In fact, those are almost always mutually exclusive goals.
My question is about what will be used for roads, and whether acquiring that product will be more environmentally sound.
I'm not immediately opposed to the technology. I'm just at least as skeptical as all scientists should be.