BOX GIRDER BALANCING ACT

Maine's new four-lane, 2,972-ft (906-m) Sagadahoc Bridge will replace the vehicular portion of the Carlton Bridge when it opens to traffic in October 2000. The project broke new ground as the state's first design/build project and broke a bridge span record in the process. To minimize the number of piers constructed in the water, designers made each span as long as possible. A total of 202 precast-concrete box girder segments were cast at a riverbank yard just upstream of the project. The precast cofferdam with a steel follower cofferdam attached, was floated into position above the previously drilled shafts at high tide. The superstructure was constructed in cantilever fashion because of the long span lengths needed, including the record-breaking 420-ft (128-m) span. Because durability is a major concern, the bridge incorporates features that ensure a long life with minimal maintenance. The 6,000 psi (41,370 kPa) concrete for the superstructure includes fly ash for decreased permeability and calcium nitrate for corrosion resistance. The superstructure is posttensioned both longitudinally and transversely. The replaceable asphalt wearing surface features a waterproof membrane, and the erosion-resistant granite cladding on the pier bases provides protection against the tidal zone of the Kennebec River and will break up floating ice. A 5-year warranty covers the bearings, sign and light supports, sign panels, luminaires, pavement and granite pier construction; while a 10-year warranty applies to the bridge deck joints and the waterproof membrane.

Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/10480594
Corporate Authors:
American Society of Civil Engineers

1801 Alexander Bell Drive
Reston, VA United States 20191-4400
Authors:
- Phipps, A R
Publication Date: 2000-3

Language

English

Media Info

Features: Figures; Photos;
Pagination: p. 34-39
Serial:
- Civil Engineering
- Volume: 70
- Issue Number: 3
- Publisher: American Society of Civil Engineers
- ISSN: 0885-7024
- Serial URL: http://www.pubs.asce.org/ceonline/newce/html

Subject/Index Terms

TRT Terms: Box girder bridges; Bridge piers; Bridge superstructures; Cantilever bridges; Cofferdams; Corrosion resistance; Design build; Durability; Erosion; Fly ash; Granite; High strength concrete; Length; Permeability; Posttensioning; Precast concrete; Warranty; Waterproofing materials
Uncontrolled Terms: Calcium nitrate
Geographic Terms: Maine
Subject Areas: Bridges and other structures; Construction; Design; Highways; I24: Design of Bridges and Retaining Walls; I53: Construction of Bridges and Retaining Walls;

Filing Info

Accession Number: 00789039
Record Type: Publication
Files: TRIS
Created Date: Mar 27 2000 12:00AM