Bridge deck resurfacing using Rosphalt 50 : interim report - first year, December 2004.
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Bridge deck resurfacing using Rosphalt 50 : interim report - first year, December 2004.

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    • Abstract:
      Most bridge decks in Maine are comprised of Reinforced Portland Cement Concrete (RPCC). Although a

      durable product, RPCC is permeable and susceptible to chloride penetration leading to corrosion of the

      steel reinforcement and eventual cracking of the bridge deck.

      To delay this from occurring, the deck surface is sealed with latex modified Portland Cement Concrete

      (PCC) wearing course or a combination of waterproofing membrane and Hot Mix Asphalt (HMA). Each

      surface treatment has a life expectancy of 15 to 25 years. The latex modified PCC is still vulnerable to

      chloride penetration but at a much lower rate. The membrane/HMA treatment protects as long as the

      membrane is intact.

      Rosphalt 50 is another product that has been used since 1983 to seal bridge decks. This is a proprietary

      asphalt additive developed by Royston Laboratories a Division of Chase Corporation in Pittsburgh, PA. It

      consists of concentrated thermoplastic virgin polymeric materials that, when added to HMA during the

      mixing process, combines with the asphalt to create an asphalt paving product that seals the RPCC deck

      and provides a wearing course in one application. Independent Chloride Ion Penetration tests have shown

      that only negligible chloride ions were transmitted through Rosphalt 50. Additional tests of Rosphalt 50

      show that it meets Superpave binder criteria at temperatures of 94˚C to -34˚C. Royston claims the product

      displays good skid resistance, resists rutting better than Superpave mix, and has a life expectancy of 20 -

      25 years. Another characteristic of Rosphalt 50 is that it retains its shape and doesn’t soften and flow

      during prolonged exposure to high temperatures.

      This paper will outline the mix design process, bridge deck surface preparation, construction, and initial

      evaluation of three bridge decks with Rosphalt 50.

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