TEMPORARY POST-TENSIONING ACCELERATES BRIDGE REHAB

The article describes the extensive substructure rehabilitation of the I-95 Bridge crossing the James River in Richmond Virginia. The need was determined for immediate repair of the substructure in order to preserve the structural integrity and load rating of the bridge. In addition to the repair of the cracked delaminated and spalling concrete, the substructure required some measure of protection against further reinforcing steel corrosion and concrete deterioration. All reconstruction was required to be done from beneath the bridge deck in order to maintain uninterrupted traffic flow. This was accomplished by designing a staged sequence of concrete removal and repair for columns and hammerhead pier caps. A structural steel underpinning system was designed to support the bridge deck if the concrete was found to be deteriorated to the extent that an entire cap required replacement. A cathodic protection system was designed using conductive coating and tri-metal anode wires to induce extremely small direct current to reverse the electrolyte action in the concrete and thereby prevent future reinforcing steel corrosion. Three repair methods were developed to allow repair of caps without compromising load carrying capacity. Details of the project are briefly described.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/11660022
• Corporate Authors:

  Scranton Gillette Communications

  380 E Northwest Highway, Suite 200
  Des Planes, IL  United States  60016-2282
• Authors:
  • Raczon, F
• Publication Date: 1989-4

Media Info

• Pagination: p. 38-40
• Serial:
  • Roads & Bridges
  • Volume: 27
  • Issue Number: 4
  • Publisher: Scranton Gillette Communications
  • ISSN: 8750-9229
  • Serial URL: http://www.roadsbridges.com/rb/

Subject/Index Terms

• TRT Terms: Bridge piers; Bridge substructures; Bridges; Corrosion protection; Driver rehabilitation; Posttensioning; Reinforcing steel; Spalling; Structural supports; Traffic flow
• Uncontrolled Terms: Rehabilitation; Temporary; Underpinning
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00484097
• Record Type: Publication
• Files: TRIS
• Created Date: May 31 1989 12:00AM