The Cube will be "world's first building made of carbon concrete"

Researchers at the Technical University of Dresden have been working with German architecture firm Henn to create the first concrete building to be reinforced with carbon fibres instead of steel.
Currently under construction at the TU Dresden university campus in Germany, The Cube is billed as the "world's first building made of carbon concrete".
Building reinforced with carbon fibre
This newly developed type of concrete offers the same structural strength as concrete reinforced with steel rebar