BONDED, POST-TENSIONING AT BWI AIRPORT

This article discusses the unique design and construction aspects related to a new parking garage at Baltimore Washington International (BWI) Airport. Bonded, post-tensioned, cast-in-place concrete was selected in order to minimize joints and promote long-term durability. The post-tensioning system used was specifically chosen to minimize life-cycle maintenance costs. Bonded systems offer significant design advantages that lead to life-cycle savings. Hardened grout locks the movement of the post-tensioning strands to that of the surrounding concrete. Hence, the force in a bonded strand is a function of the deformation of the surrounding concrete. Bonded post-tensioning also has an inherent capacity to provide resistance to progressive collapse. The bonded post-tensioning system used in this project provides total encapsulation of the strands using a high-density plastic duct with watertight mechanical duct-to-anchorage couplers. Permanent end-caps are included to completely seal the anchorages and high-performance grout pumped through the tendons provides an additional layer of protection. When the project is completed in late 2003, more than 73,000 cubic yd of cast-in-place concrete will have been used to construct the foundations and superstructure during the fast-track construction cycle. Careful preplanning, preconstruction mockups and collaborative input by all project participants are considered the key success factors for this project.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/4163061
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Loper, J
  • Sanschagrin, D
  • Crigler, J
  • Kline, D
• Publication Date: 2003-5

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 105-110
• Serial:
  • Concrete International
  • Volume: 25
  • Issue Number: 5
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0162-4075

Subject/Index Terms

• TRT Terms: Airport parking facilities; Anchorages; Bonding; Case studies; Cast in place concrete; Concrete construction; Construction management; Durability; Encapsulation; Grout; Life cycle costing; Maintenance; Parking garages; Posttensioning; Service life; Structural design; Tendons (Materials)
• Identifier Terms: Baltimore Washington International Airport
• Subject Areas: Construction; Design; Finance; Highways; Maintenance and Preservation; Materials; Terminals and Facilities; I32: Concrete; I50: Construction and Supervision of Construction;

Filing Info

• Accession Number: 00942369
• Record Type: Publication
• Files: TRIS
• Created Date: May 5 2003 12:00AM