> reinforcing elements like rebar and tension cables pre-installed inside the forms eventually. Without these you have a weak shell not a liveable structure. C

> reinforcing elements like rebar and tension cables pre-installed inside the forms eventually. Without these you have a weak shell not a liveable structure. Concrete doesn't have tensile strength for shear and compressive loads. I watch a new building go up nearby. It was 4-5 days of welding rebar and pouring concrete took 4-5 hours.