Photo by Tudor Van Hampton Building a cement plant is key to survival, local firm says. Rendering courtesy Ozinga Bros. Inc. Ozinga filed an Illinois permit application for its proposed plant under a new business unit, Universal Cement, in December 2008. It expects a decision later this year. Related Links: U.S. Cement Production Flat Following 2009's Big Decline A fourth-generation, family-owned concrete company in Chicago wants to build its own cement plant so it can become more vertically integrated.Ozinga Bros Inc., founded in 1928, has proposed building the 1-million-ton-per-year plant on a 50-acre parcel it owns on Chicago's South Side.
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.