I imagine most concrete applications in the world are actually reinforced concrete applications. Without rebar, I don't think you can build most spanning concre

I imagine most concrete applications in the world are actually reinforced concrete applications. Without rebar, I don't think you can build most spanning concrete structures that we're use to. This would leave block/stone to mostly go into pure vertical loading applications. It'd probably be reasonably useful for some wall applications, but that seems pretty limited. Even for a true foundation application, it seems like large stone blocks embedded in a concrete matrix would be pretty heterogenous, and you could potentially end up with weird stress concentrations that would be more difficult to model (and perhaps have less desirable failure modes) than rebar concrete. Another benefit of the "break down and put back together" approach of concrete is that it allows you to get very accurate and precise predictions of behavior. Large blocks will be less predictable. This will likely lead to requiring higher safety margins (which means more material/energy/cost).