The first of two floating concrete batch plants is now in operation on the $3.9 billion Tappan Zee Bridge replacement project. Workers are constructing a new bridge to supplant an aging span between New York's Rockland and Westchester counties, and with materials delivered by barge, the plant removes all trucks from the roadways. According to this report in The Rockland Times, the plant "can cast about 125 cubic yards of concrete per hour." The original cantilever bridge was completed in 1955, and plans for a replacement have been in the works for more than a decade. It is expected to be taken off line when the new bridge opens in 2016. Read More