Engineering360: "Researchers Developing Concrete Wood for Construction"

Quickly, and I need to check my memory against facts, wasn't a similar project undertaken with concrete freighters, some of which survived the war? I know about the ice and wood chip/sawdust ones - even speculated to aircraft carrier size...BUT the concrete ones?

Great idea if the can sort out the fire thing robustly - I think that, the fire rating, will be the hardest part of selling the stuff. (Specially if it is flammable under some conditions)