Cement or concrete has high compression strength but very brittle. It can't withstand the bending stress by itself. So, we have to reinforce it with steel bar to improve the toughness and the ductility. This material is the main component of super gas rig supporting structure. The footage video belongs to BBC Richard Hammond's Engineering Connections and I don'y have any copyright for that. Thanks for watching...!!! ---------------------------------mechanicalengboy.wordpress.com---------------------------------