Efficient concrete overlays

Concrete overlays have a long history and proven success in the state of Iowa. Mitchell and Worth counties in north central Iowa have led the way. In the past three years, they have put down approximately 241km of 102mm concrete overlay. Concrete Foundations Inc. (CFI), based out of Hiawatha, Iowa, has slipformed almost 80km of the counties' overlays, including 45km this paving season near the town of Osage. CFI has slipformed most of the overlays with its GOMACO two-track GP-2600 paver. This season, the co
February 15, 2012 Read time: 2 mins
Efficient concrete overlays are being achieved with the use of stringless controls

Concrete overlays have a long history and proven success in the state of Iowa. Mitchell and Worth counties in north central Iowa have led the way. In the past three years, they have put down approximately 241km of 102mm concrete overlay.

Concrete Foundations Inc. (CFI), based out of Hiawatha, Iowa, has slipformed almost 80km of the counties' overlays, including 45km this paving season near the town of Osage.

CFI has slipformed most of the overlays with its 218 Gomaco two-track GP-2600 paver. This season, the company added the Leica Geosystems stringless system and a new GOMACO four-track GHP-2800 paver to the inventory. Both were put to work on the project near Osage.

The new unbonded concrete overlay is 6.7m wide, and the material is placed directly on the existing asphalt surface of the roadway. The surface only has to be swept clean before the mix is dumped on it and concrete slump averages around 13-25mm.

The firm has seen increased production with fewer people needed for stringline maintenance and setup. Five site personnel who normally worked with the stringline are now used elsewhere during the paving process. The lack of stringline also allows them to focus more on quality and production rather than stringline maintenance.

The GOMACO GHP-2800 is pulling burlap for a burlap drag finish behind the paver. Finishers work behind the paver with bull floats before a texture/cure machine applies a longitudinal tine and white spray cure.
Concrete milling, paving & compaction

For more information on companies in this article

Related Content

  • Thin surface whitetopping for busy roads
    April 5, 2017
    In the US, considerable experience has been gained with thin white-topping (TWT), with the technique now being used in other countries as well. In the US hundreds of km of TWT is being paved every year, much of it across the mid-western states. A variation of white-topping is being used in Oregon to replace badly rutted asphalt truck lanes on primarily long uphill grades with durable, continuously reinforced concrete pavement (CRCP). Oregon has carried out several of these concrete inlay projects over the
    Read More
  • Novel concrete paving method used in Germany
    January 25, 2017
    A novel dual-layer concrete paving technique has been used on jobsites in Germany on the country’s high-speed Autobahn network This technique allows the construction of a strong and durable roadway structure able to cope with heavy traffic loads and offer a long working life. In four German states, Wirtgen SP-1500 slipformers have been employed by four different contractors to carry out dual-layer paving. The method allows a noise-reducing, non-skid exposed aggregate surface to be placed over a bottom
    Read More
  • Innovations are pushing boundaries in the concrete road paving sector
    February 18, 2013
    The concrete road paving market continues to develop - Mike Woof reports Concrete road paving technology continues to evolve, with new equipment and techniques coming to market. Although concrete road construction has been used for many years, problems with early generation technologies affected this market segment. The first concrete roads were constructed in sections, which led to problems at joints but these were addressed many years ago with the advent of slipform paving. Concrete roads constructed in t
    Read More
  • US highway rebuild uses hard-wearing asphalt
    July 18, 2012
    Guntert & Zimmerman equipment is being used to create a new hard-wearing asphalt surface on a key Interstate highway in the US state of Kansas as Mike Woof reports A busy Interstate highway in the US is now benefiting from a new, long-lasting surface. The road, Interstate 70 in Western Kansas, was in need of resurfacing. The full-depth asphalt roadway, up to 508mm thick in certain sections, had reached the end of its working life.
    Read More

Highlighted Content