Volvo Construction Equipment, Shippensburg, Pa., plans to introduce the Volvo Intelligent Compaction (IC) system for select Volvo asphalt compactors available in two packages — Volvo IC and Volvo IC with Density Direct. In addition to offering the pass mapping, temperature mapping and data storage features of the Volvo IC system, the company said the Volvo IC with Density Direct includes the industry’s first real-time density mapping technologies. The system will be available for purchase in fall 2015 and will be sold, installed and supported by the Volvo Construction Equipment dealer network.
“Density mapping has been described as the ‘holy grail’ of intelligent compaction. The first to come up with the technology will be the one to radically advance the paving industry, it was said, and that’s exactly what Volvo has done,” said Fares Beainy, research engineer, Volvo Construction Equipment.
“For years, contractors have relied on IC systems with stiffness calculations instead of density, which is not the true metric by which contractors are evaluated and paid. With Density Direct, operators have real-time access to the metric that ultimately determines the success of their work, density,” Beainy said.
Within the Density Direct system is a calibration screen, where the user sets the target density for the project. Once fully calibrated with data specific to the application, the Volvo Intelligent Compaction with Density Direct system produces a density calculation that is designed to be accurate to within 1.5 percent of core sampling, providing a real-time reading of density values over 100 percent of the mat.
Calibrations also are “saved” by the machine, so operators can assign calibrations to certain elements of a job, and switch back and forth between calibrations to meet the demands of specific
The user interface of Volvo IC with Density Direct depicts a density map, showing each square foot of rolled asphalt in a color representing density, and also provides a real-time numerical density reading displayed in the corner of the screen. Both Volvo IC and Volvo IC with Density Direct are designed to offer real-time temperature and pass mapping data.
Using the 8-in.-by-10-in. color monitor of the Volvo IC system, the pass mapping function captures each compactor pass and drum overlap with an individual color, so that the operator can see gaps and work to maintain uniform coverage. Temperature mapping provides the operator with a temperature map that shows the path of the compactor overlaid with the last recorded surface temperature.
Data gathered from pass mapping, temperature mapping and density mapping is stored on the IC system’s internal 14 GB hard drive, which provides enough space for about seven months of data logging. Data can be backed up to USB drives in VEDA format — the freeware system 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 accurate to within 0.5 in. Both Volvo IC packages meet state DOT and FHWA requirements for intelligent compaction specifications. RM