Bridge deck resurfacing using Rosphalt 50.
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Bridge deck resurfacing using Rosphalt 50.

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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 sealed with Rosphalt 50.

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