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Rosphalt Waterproofing Wearing Surface System Applications in Ohio By John Tortorete, Chase Construction Products/Royston or Superpave designs. Using a Rosphalt solution designed to 2 percent air voids or less enables the design as a waterproofing system that has proven to be better at waterproofing than most other systems. The sec- ond reason it is chosen is its performance primarily with advantages in less rutting and shoving. The owners choose Rosphalt where corro- sion, traffic loading, pavement life and expedient repair are necessary. Most of the bridge projects were one-day installations with Rosphalt. The Steubenville project is the largest structure using Rosphalt at this time, while the State Route 36 project in Urbana consisted of three two-lane bridges. For the Urbana area project it was necessary to pave on one side of the bridge at a time, and allow traffic on the other. In Green and Summit counties, Rosphalt was placed over new Fiber Reinforced Plastic (FRP) decks. Rosphalt can be produced in either drum or batch plants. In drum plants, Rosphalt is delivered in bulk tankers and is introduced through a mineral filler silo. In a batch plant, Rosphalt is supplied in bags that melt in the mixing process when it enters the pug mill via conveyor or by manual feeding. Paving with Rosphalt is similar to conventional paving. It is delivered in well-covered asphalt trucks; applied with a typical paver; and rolled with smaller compaction equipment compared to Superpave or stone matrix asphalt (SMA) mixes. Typically, in about an hour after paving the surface can be opened to traffic. For more information on Rosphalt, contact Mike Freisthler, the area representative, by e-mail at Mike@asi-roads.com, or by phone at (cell) 937-726-0861 or (office) 937-498-4802. You can also contact John Tortorete at jtortorete@chasecorp.com for technical assistance. Ohio has used Rosphalt-50, a waterproofing wearing surface system, on bridges throughout the region, such as in Steubenville with Lane Industries; in Green County with Barrett Paving; in Sidney with Freisthler Paving on the Emerson loading dock; in Summit County with Mar-Zane Asphalt; and in Urbana with Valley Asphalt. In 2008, Rosphalt is scheduled to be used on a bridge in Toledo with Gerken Paving. The reason Rosphalt is used for these jobs was to provide a water- proofing system as well as a long-life wearing surface without degra- dation. These bridges received both the required waterproofing and a long-life wearing surface in a “One-Step” operation, saving in both mobilization and traffic control. Rosphalt is useful for much more than just bridge decks. In Sidney, Emerson Company was looking for a fast repair using a long-lasting flexible paving surface to rehabilitate its loading dock area. Use of concrete was too time consuming – and the docks could not be out of service for more than one day – and too expensive. Regular asphalt was not ideal since it could not hold up under heavy-load conditions with the trucks moving and utilizing sharp turning radius. Another advantage using Rosphalt is the docks could be in service as soon as one hour after paving. Rosphalt is not considered in the same category as other asphalt designs since it is a “dry mix” additive that modifies hot mix asphalt OA 20 Winter 2008 Ohio AsphaltPDF Image | Porous Asphalt Pavement
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