Performance of thin bonded epoxy overlays on asphalt and concrete bridge deck surfaces.

Details

• Creators:
  Young, Logan Michael ; Durham, Stephan ; Liu, Rui
• Corporate Creators:
  University of Colorado at Denver
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bridge decks
  • Overlays (Pavements)
  • Epoxides
  • Deicing chemicals
  • Anti-icing
  • Bond strength (Materials)
  • Skid resistance
  • Permeability
  • Surface texture tests
  • Costs
• Publication/ Report Number:
  CDOT-2014-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Colorado
• Corporate Publisher:
  Colorado. Dept. of Transportation. Applied Research and Innovation Branch
• Abstract:
  This study is the evaluation of two thin bonded epoxy overlays: SafeLane (marketed by Cargill), and Flexogrid ; (developed by PolyCarb). SafeLane is advertised as an anti-skid/anti-icing overlay that stores deicing chemicals for ; release during winter events. Flexogrid is an anti-skid overlay. These two products were compared on the basis of ; physical properties, including mean texture depth, surface friction, bond strength, ability to stop chloride intrusion, ; and anti-icing properties, as well as traffic safety and cost. Both overlays worked as intended when they were initially ; applied on the bridge decks. Mean texture depth and friction testing have shown that they both provide a durable ; wearing surface with good traction. All the SafeLane bond tests exceeded 250 psi (1.72 MPa). Flexogrid had initial ; high bond strengths, but had varied failure modes. However, the delamination of the Flexogrid overlay was identified ; on the bridge deck even after this product was reapplied. Permeability and chloride testing of the underlying concrete ; decks indicated that both overlays work well to protect bridge decks from chloride ingress. Permeability was high, but ; the chloride counts did not increase with age. The anti-icing property of SafeLane is effective when pre-charged with ; deicing chemicals. The three sites evaluated in this study indicate a reduction in crashes, but further study is needed to ; monitor the long-term performance in crash reduction. ; Implementation ; CDOT should use the information contained within this report to develop construction specifications for thin bonded ; overlays. SafeLane can be considered for use on high crash rate bridges, where its high cost can be offset by an ; increase in traffic safety. If SafeLane is to be used as an anti-icing overlay, it should have deicing chemicals applied ; more often, and in smaller amounts. Pre-charging should be used when possible. Installation of Flexogrid should not ; be considered on bridges before the reasons causing the delamination are investigated. Studies of both overlays should ; continue so their long-term impacts on traffic safety can be analyzed.
  More +
• Format:
  PDF
• Funding:
  84.14
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27472/dot_27472_DS1.pdf
• File Type:
  [PDF - 16.88 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b4bb7dee6a76d413477ea755ae9bf5d21ccdf2bce55dd9fe4cf95c8c3631873a