Caterpillar B Series tandem vibratory rollers (CB64B, CB66B, and CB68B) are 12- to 14-metric-ton machines that feature wider drum widths, high-flow water spray systems, operator comfort enhancements, and a number of technological features.
Many of the technological upgrades are offered through Cat Compaction Control. They include Auto-Adjustable Compaction (AAC), Pass-Count and Temperature Mapping, Machine-to-Machine Communication, and Compaction Meter Value (CMV).
AAC optimizes compaction by delivering the highest amplitude possible without de-coupling or over-compacting, according to Cat. The technology includes both the front drum and rear drum. The system is able to adjust through the full range of amplitudes in as little as 4 seconds for uniform compaction throughout the mat.
Pass-Count and Temperature Mapping systems provide real-time visual references of the passes made and asphalt mat temperatures present. The Machine-to-Machine Communication system helps keep rolling patterns in sync by sharing coverage and pass-count maps between the operating displays of multiple machines. By viewing the color display, operators can monitor areas of coverage and the number of passes made. If a trailing operator sees an area of missed coverage, they can pick it up to ensure the entire rolling pattern gets the attention that is needed. This system is helpful when performing echelon compaction when multiple machines are executing five or seven pass rolling pattern.
CMV technology uses a drum-mounted accelerometer to measure and record forces of the vibrating drums. A calculation derived from the recorded forces is used to create a unit-less value that provides an indication of stiffness. This unit-less value calculation is referred to as a “composite stiffness value” that indicates stiffness of the current and supporting layers beneath the drum. The system is capable of utilizing RTK-level accuracy to provide the highest level of GNSS positioning, the company says, and is able to correlate compaction, frequency, and pass-count data to specific location.