Abu Dhabi has launched a drive to bring 55 billion dirhams ($15 billion) of private capital into its infrastructure build-out. Until now, the emirate has mainly used public-private partnership deals for power and water projects. It now wants to broaden that out to a far wider range of assets, including dams, roads, schools, sports facilities, and urban landscaping. A slate of 24 projects is due to be launched this year and next year under the ex…