Photo Courtesy Gate Precast Co. The striking gray panels feature both concave and convex radii. Related Links: See all of the Best of the Best Projects 2012 Winners Precast Concrete Museum Challenges Project Team Entries for ENR's First Global Best Projects Competition Are Due Feb. 28 Occupying a 170-ft-tall building that sits on a 180,000-sq-ft site, the Perot Museum of Nature and Science in Dallas features a facade that is made up of more than 700 unique precast-concrete panels that cover the museum's tower, atrium and plinth.Project team members faced multiple obstacles in the production, quality and installation of this
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.