Dive summary:

• By introducing carbon nanofibers into the cement used to make concrete, researchers at the University of Alicante in Spain have turned concrete from a solid electrical resistor into a conductor that will pass current.
• Among the benefits they see are heating buildings directly by warming their walls and preventing ice building up on bridges and conventional road surfaces and on airport runways.
• The researchers say that the nanofibers have no effect on the concrete's structural behavior, so conducting concrete can be used exactly like traditional concrete.

From the article:

This new product has a great versatility, since any existing structure or surface can be coated with it, keeping thermal control in it by applying continuous electric current. ...