Photo by Tudor Van Hampton Attendance at this year's World of Concrete is expected to reach 50,000, slightly higher than last year's 48,554. Related Links: Clean Diesels Debut at World of Concrete New Concrete Transit Mixers Get a Turn McCarrans $99 Million Air Traffic Tower Takes Shape The annual World of Concrete show opened its doors with moods and traffic slightly higher than last year."There is a tinge of optimism," said Ed Sullivan, chief economist for the Skokie, Ill.-based Portland Cement Association, on the first day of this year's show in Las Vegas. "Only recently have we seen the job
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.