A mid high unemployment and a credit freeze that has delayed or eliminated construction plans, a dip in cement consumption drove down prices during the first half of 2010. Cement prices have fallen in six of the last seven months, including relatively large monthly declines of 1.5% in April and 1.4% in May, according to the Bureau of Labor Statistics’ producer price index. Related Links: ECONOMICS: With Stimulus Spending Running Out Recession Will Keep Grip on Costs CONFIDENCE SURVEY: Industry Firms Begin To Believe The Worst May Soon Be Over COMPENSATION: Recession Squeezes Salaries HIGHWAYS: Soaring Asphalt and Fuel Prices
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.