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Performance of thin bonded epoxy overlays on asphalt and concrete bridge deck surfaces.
  • Published Date:
    2014-06-01
  • Language:
    English
Filetype[PDF-16.88 MB]


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Performance of thin bonded epoxy overlays on asphalt and concrete bridge deck surfaces.
Details:
  • Publication/ Report Number:
    CDOT-2014-2
  • Resource Type:
  • Geographical Coverage:
  • Format:
  • 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.

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