New Green-Concrete Process Combines Seawater, Flue Gas

(Las Vegas, Nevada) -- Cement scientist Brent Constantz wants concrete to be the"hero" that cleans up dirty coal. "The reality is, coal is not going away," he says. "Weneed to meet the world’s power demands without emitting more carbon." His answer?...

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History of a Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific...

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Moveable Bridge

A moveable bridge is a bridge that moves to allow passage for (usually) boats or barges. By making the bridge moveable it may be made low, which avoids the expense of high piers and long approaches, greatly reducing the cost of the bridge. The principal...

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