In the never-ending war on corrosion, a patented, reinforcing-steel bar certified to last at least 100 years is receiving a second life thanks to venture capitalists hell-bent on improving infrastructure. But it is going up against a heavy tradition of epoxy-coated reinforcing bars, which are constantly on the move in an effort to stay a step ahead of the competition. Photo: NX Infrastructure An Obama-style stimulus plan would call for miles of steel reinforcing bar. Related Links: America May Gain from Materials Designed To Stretch Your Stimulus Dollars Packing in Particles Yields 100-Year Concrete Mixes Asphalt ‘Armor’ Is Wearing Well
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.