There are so many things that are effected when the requirement for placing steel, or other fixed reinforcement, is eliminated or reduced. Not only is the weight of the entire structure reduced significantly, but the labor intensive placing and tying is gone. Gone!
The ability to pour reinforced concrete as fast as it can be pumped is extraordinary. Not only is the weight of steel greatly reduced but inconsistencies in aggregate are leveled up by the continuous, high strength fibers spanning all areas of the structure. The concrete itself and its compressive strenth is now the brace for the fibers to enhance tensile strength. And unlike steel reinforced concrete, the UHMWPE reinforcement can go to the very edge of the structure without being concerned about environmental corrosion issues.