Volvo Construction Equipment will soon introduce the Volvo Intelligent Compaction (IC) system for select Volvo asphalt compactors. The new system will be available in two packages—Volvo IC and Volvo IC with Density Direct—the latter package providing the pass mapping, temperature mapping, and data storage features of the IC system, says Volvo, but adding the industry’s first real-time density-mapping technology.
According to Dr. Fares Beainy, research engineer at Volvo, IC systems typically report material stiffness, which, he says, is not the true metric used to evaluate and pay contractors. With Density Direct, says Beainy, “operators have real-time access to the metric that ultimately determines the success of their work—density.”
Within the Density Direct system is a calibration screen that allows setting target density for the project. Once fully calibrated with data specific to the application, the system produces a density calculation that is accurate to within 1.5 percent of core sampling, says Volvo, providing a real-time reading of density values across the entire mat.
Benefits of the system, says the company, include the ability to make compaction adjustments during the paving process, fewer core samples for verification, improved mat quality, and greater uniformity, compared with nuclear-gauge testing. The system saves calibrations assigned to certain elements of a job, says Volvo, allowing operators to switch among calibrations to meet the demands of specific job elements.
The user interface for the Volvo IC with Density Direct depicts a density map that shows each square foot of rolled asphalt in a color representing density and provides a real-time numerical density reading displayed in the corner of the screen. Both Volvo IC and Volvo IC with Density Direct offer real-time temperature and pass mapping data.
The pass-mapping function captures each compactor pass and drum overlap with an individual color, according to Volvo, allowing the operator to see gaps and to work toward uniform coverage. Temperature mapping shows the path of the compactor with an overlay depicting the last recorded surface temperatures.
Data gathered from pass mapping, temperature mapping, and density mapping is stored on the IC system’s 14 GB hard drive, which provides enough space for approximately seven months of data logging, says Volvo. Data can be backed up to USB drives in the VEDA format —the Freeware system, says the company, promoted by the Federal Highway Administration (FHWA) for IC systems. With optional differential GPS, the data gathered from Volvo IC is linked to location information said to be accurate to within half an inch. Both Volvo IC packages meet state DOT and FHWA requirements for intelligent compaction specifications.
According to Volvo, Density Direct was developed and tested as part of the FHWA Highways for LIFE Technology Partnerships Program. The technology was used on various full-depth and overlay asphalt-pavement projects and later evaluated by independent users at sites throughout the country. The results, says the company, were overseen by University of Oklahoma researchers and showed that Density Direct calculations were within 1.5 percent of core samples at 180 test locations.
Volvo IC and Volvo IC with Density Direct will be available in Q4 2015 on new Volvo asphalt compactors, initially including models DD110B, DD120B, and DD140B sold in North America. Aftermarket availability for Volvo asphalt compactors will follow exclusively through Volvo dealers.
Volvo has released this promotional video: