The sinister effects of inhaling crystalline silica—which, like asbestos, slowly leads to lung disease and cancer—have been known for years. Only recently have tools that trap the deadly dust become widely available. Slide Show Photo: Tudor Van Hampton / ENR This year’s World of Concrete attracted many new options in dust control. DeWalt now offers cordless portability in dust control “There’s been a drumbeat,” says Matt Gillen, senior scientist at the Washington, D.C.-based National Institute for Occupational Safety and Health. Over the last decade, more suppliers have brought out controls designed to capture dust at the source: the business end
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.