On the Job
The rolling hills of the region are one of the most beautiful features of the new course. Those same hills also were challenges when laying the sub-base and surface materials. "The machine can climb hills very easily," Sanchi said.
Work began with a Cat excavator digging a trench at a depth of 20 cm (7.8"). The paver actually placed the sub-base, which included aggregate of 30 mm (1.2") or smaller. The depth of the stabilised lift was 20cm (7.8"). A small dump truck delivered the materials to the paver, which placed it as it would a normal asphalt surface. It was compacted by a Bitelli roller.
The AP300 then made a second pass, placing a 3cm (1.2") lift on the sub-base. The surface material included a mix of small native stone and a transparent resin that provided the look of a natural color and grain, but with long-term durability.
"The machine can place any type of material without problems: asphalt, cement, gravel, sand, polymers," said Sanchi.
The plant providing the materials was about 35km (22 miles) away. A large truck delivered the materials to the jobsite. The surface materials than were loaded to a mini-dump, which transported them directly to the paver.
"The haul truck delivered the materials to different locations so the mini-dump would only have to travel a maximum of 500m (1,640')," Sanchi said.
Material segregation wasn't a concern because of the independent augers on the machine, Sanchi said. There were no specifications for density, given the use of the path. Still, the mat had to be compacted. "The sub-base and surface were built to handle some fairly heavy weights," he said. "The path can be traveled on by vehicles exceeding 9tonnes (10 US short tons) without a problem."
The compaction process started with the Cat AS3173 Screed. "The screed lays material to the desired width and depth while providing a smooth finish with initial compaction," Sanchi said. A Bitelli mini-roller, in vibratory mode, completed the compaction process with two or three passes, depending on the conditions.
Production was good, with the paver placing the surface course at a pace of better than 1 km (0.6 miles) per day.
"It was a great job," Sanchi said. "It's a beautiful, prestigious course that we're honoured to be part of. We're also thrilled to do our part to contribute to the course: to create a path that fits so naturally into its surroundings.
"The hills and curves were a challenge, but nothing that couldn't be overcome.