An Exodermic bridge deck is a lightweight modular deck system that lends itself to rapid construction. It combines an unfilled steel grid with a 90 mm to 115 mm reinforced concrete slab, making efficient use of the constituent materials, handling spans over 4.4 meters between supports, and weighing as little as 245 kg/m2. It is in use on over 40 bridges in the United States. By reducing deck dead load, an Exodermic deck permits a bridge to achieve a higher live load rating. An Exodermic deck typically weighs 35% to 50% less than the reinforced concrete deck that would be specified for the same span. Reduced dead load can minimize or eliminate structural strengthening required to achieve a required load rating. A contract has been let to re-deck the famous Eads Bridge over the Mississippi River in St. Louis. The weight savings possible with the Exodermic design was crucial in the rehabilitation of this bridge for vehicular traffic. In addition, the Exodermic design chosen allows the deck to span continuously over floor beams spaced on 3.66 meter centers, eliminating the need for steel stringers. For the covering abstract see ITRD E106406.


  • English

Media Info

  • Features: References;
  • Pagination: p. 608-16

Subject/Index Terms

Filing Info

  • Accession Number: 00801588
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-2854-7
  • Files: ITRD
  • Created Date: Nov 8 2000 12:00AM