Uncertainty over reauthorization of a federal transportation bill could curtail future concrete consumption, said attendees at the World of Concrete show held last month in Las Vegas. A protracted wait time for a new bill creates long-term budgeting uncertainty for municipalities that could result in smaller, less ambitious projects. Photo: Tudor Van Hampton For ENR Vendors showed wares in Las Vegas, as experts noted that renewal of the highway bill is needed to bring back the lagging cement market. Photo: Tudor Van Hampton For ENR Related Links: World of Concrete 2011: Around the Exhibit Hall “We’re hearing that we could
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.