Lightweight Concrete In Bridges


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Title: Lightweight Concrete In Bridges

Author(s): Robert E. Philleo

Publication: Concrete International

Volume: 8

Issue: 11

Appears on pages(s): 19-22


Date: 11/1/1986

Deck replacement on two pioneer lightweight concrete bridges and the construction fo the world's longest lightweight concrete span are described. Lightweight decks were placed on the two high-level Cape Cod Canal bridges in 1933-35. After 45 years service, the bridges required major rehabilitation or replacement. The decision was to replace them iwht a lightweight concrete-filled steel grid, construction of which would take place during the off-tourist season. The world's longes such span, the Parrott's Ferry Bridge in California, has a total length of 1290 ft (393 m) with a mian span of 640 ft (195 m). It was erected by the cantilever method without using falsework. There were 78 box girder sections each 16.5 ft (5 m) long. Concrete was cast in place and was delivered by pumps which were initially placed on the ground but ultimately on top of each pier.