Smart paint promises to make it easier to identify & repair cracks or corrosion in bridges & other infrastructure

http://www.economist.com/node/21548497

/ damage wind turbine mixture fly-ash fine-grained waste product coal-fired power stations carbon nanotubes cylindrical molecules elemental carbon two binding agents sodium silicate sodium hydroxide similar to cement suitably tough paint it dries fly-ash coating withstand elements exposed places conduct electricity cracks corrosion painted surface conductivity affected by cracks corrosion conductive inundated chloride ions corrosion by salt water their conductivity increases monitor damage /