Improved Durability of Patched Concrete Bridges Against Corrosion by Using a Fiber-Reinforced Polymer Overlay

Shallow depth overhead and vertical surface patches applied to damaged concrete bridges typically crack extensively due to shrinkage and corrosion. Cracking and full or partial delamination of the patching material, mostly damaged by corrosion from the concrete substrate, is generally unavoidable. To provide more durable patches, the use of a fiber reinforced polymer (FRP) fabric applied as an overlay on top of a traditional patching material was investigated. The FRP overlay has the potential of keeping the patch in place for a longer period by serving as secondary reinforcement, restraining the diffusion of moisture and chloride ions, slowing the corrosion process, and also improving the performance of the patch by shifting the crack pattern. Finite element simulation was used to select an FRP material and configuration that would perform adequately as an overlay. An accelerated corrosion test was conducted to experimentally assess the impact of using an FRP overlay on corrosion in patched concrete beams. The strain due to corrosion was measured on specimens with and without FRP. These measurements showed a reduction in strain and crack propagation on specimens with an FRP overlay. The change in stress distribution in the concrete and patch due to the application of the FRP overlay was further investigated using finite element simulation, and revealed the mechanism for the development of concrete and patch cracking due to corrosion and the delay in the onset of cracking.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Photos; References; Tables;
  • Pagination: 13p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01046265
  • Record Type: Publication
  • Report/Paper Numbers: 07-2594
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 7:17PM