Contractor Park Construction paves a perfect surface inside U.S. Bank Stadium in Minneapolis, Minnesota.
“We’re doing something that nobody in the industry has done before—putting an asphalt layer down underneath an athletic field,” says John Lenarz, Park Construction.
The team met the challenge of paving a stadium bowl that is oval-shaped, and includes concrete drainage and other details like conduit for end zone cameras.
The use of 3D paving helped the Park Construction crew quickly place a high quality surface.
A Cat® AP1055E Paver with an AS2302C Screed laid down the mix with AccuGrade™ PCS900 is integrated with the Cat Grade Control factory 2D system.
A Cat® CB66B roller was used for breakdown aided by a PS360C rubber tire roller and a CB64 roller. A CB24B roller (three-ton) served as finish/touchup roller.
In the end, the paving job was picture perfect.
John Lenarz, paving supervisor and superintendent, says, “There were a lot of eyes on us. We’re doing something that nobody in the industry has done before—putting an asphalt layer down underneath an athletic field. With that and just working with all the other trades and contractors on the site, the logistics of moving about and getting your work done, it was challenging.”
"The support that the paving crew and myself received from Caterpillar, Ziegler Cat, and Trimble was crucial. It was truly a team effort," says Lenarz.
Morning meetings with prime contractor, Mortensen Group, included logistics of getting asphalt trucks in and out. “They would ask how many trucks for the day, how many tons for the day. They wanted to keep us moving along with our work, and maybe reroute some of the subcontractors to a different day,” Plieseis says.
Hot mix left the asphalt plant at 280-290 degrees Fahrenheit, and the goal was to have mix delivered to the site at 250 degrees Fahrenheit. “We had several laborers staged throughout the project to flag traffic, and make sure trucks weren't sitting on the street an excessive amount of time and that they could back in safely,” Plieseis says.
A Cat CB66B Steel Drum Roller running at low amplitude and high frequency was used for breakdown, with 90 to 91 percent compaction. A PS360C Rubber Tire Roller, and a CB64 Roller aided in compaction. A CB24B Roller (three-ton) served as finish/touchup roller. Final compaction of 93-94 percent exceeded the density targets of 92 percent.
In the end, the paving job was picture perfect. Before leaving the stadium, Bloch took several cell phone photos of the finished product. “It was smooth, not a roller mark or anything,” he says. “That’s because of the 3D paving system that we used. That’s the flattest, smoothest surface I’ve ever seen. It looks just perfect.”
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