The electrically conductive concrete, developed by researchers at the University of Nebraska-Lincoln, can de-ice roads and pavements without the need for chemicals. It is for the most part the same as regular concrete, but 20 percent of its ingredients aren't exactly standard: steel shavings and carbon particles, which give the mix enough conductivity that it can melt ice and snow while remaining safe to the touch. http://www.sciencealert.com/this-electrically-conductive-concrete-melts-snow-without-chemicals
