Equipment to Pave Thick and Thin
The ultrathin bonded wearing course (UTBWC) treatment is a gap-graded surface layer that incorporates an asphalt emulsion tack coat immediately followed by a 3/8- to 3/4-inch polymer-modified asphalt pavement. To achieve this, contractors are advised to use a paver equipped with a spray bar in front of the screed.
During a presentation to industry May 30, 2023, representatives of the National Center for Asphalt Technology (NCAT) and MnRoad shared data from a variety of test sections and trafficked roadways where open-graded friction course (OGFC) and UTBWC surfaces had provided information for researchers and departments of transportation (DOTs). Amid the presentations, the use of spray pavers to get best results was discussed.
One participant shared the Alabama DOT requires micro-milling and the use of a spray paver on UTBWC projects. Another participant spoke of the need to either purchase or rent a spray paver to bid on these projects in the state of Minnesota. Share your experiences with getting a UTBWC executed perfectly on our facebook page when this article goes live. In the meantime, check out the spray pavers that original equipment manufacturers (OEMs) have taken the time to bring to your attention with AsphaltPro.
Astec Industries of Chattanooga offers the Astec SP-200 Spray Paver with a Tier 4F, Cummins® QSB 6.7 230-horsepower engine. Its spray system comprises:
- A spray bar containing three rows of spray nozzles that are controlled automatically by a microprocessor
- The spray bar can extend with the screed extensions
Visit https://www.astecindustries.com/road-construction for more information.
Dynapac North America of Fort Mill, South Carolina, offers the SD2500CD PROTAC spray paver. Its spray system features:
- 25 independent nozzles that are automatically activated by moving the spray bar or extending the screed.
Visit https://dynapac.com/en/products/paving?tab=products for more information.
Vogele of Antioch, Tennessee, offers the SUPER 1800-3i SprayJet paver with a Cummins B6.7 – C173 173-horsepower engine. Its SprayJet module comprises:
- 24 spray nozzles with a spray pressure up to 43.6 psi on five spray bars that pivot two ways.
- Spray width of 8 feet, 4 inches to 19 feet, 8 inches.
Visit https://www.wirtgen-group.com/ocs/en-us/voegele/voegele-products-94-c/ for more information.
Additional paving and pavement maintenance equipment for all paving methods and treatments are found in the product galleries of this publication. Check out the entries below for those the industry was ready to share with you this month.