Dynapac’s fifth-generation CA2500 through CA4000 mid-range soil compactors can be equipped with multiple levels of compaction control from the basic compaction meter with new active bounce control technology to the full compaction optimizer. With the needs of road builders in mind, the range is ready to be paired with Dynapac’s Intelligent Compaction solution, the compaction analyzer.
Design engineers worked to place these machines at the center of a system covering the three stages required for optimum results on a project: pre-rolling preparation, performance during rolling and post-rolling “validation,” which includes activities such as documentation for quality control and for acceptance.
The operator takes charge of the CA-Series roller from either an open platform or a climate controlled comfort cab with a seat that allows up to 180 degrees of movement in unison with the steering column and display cluster. All machine functions are at the operator’s fingertips and comfort is further enhanced by the tilt steering wheel and adjustable seat. Loss of traction, even in the toughest conditions, is swiftly counteracted by an easy-to-use toggling gear shifting system, or with an optional passive anti-spin traction system.
Preparation Stage
According to Shawn Cheney, Dynapac vice-president and business line manager, the preparation stage more fully supports “project planning.” He explained that equipping rollers with the Dynapac Compaction Analyzer and GPS allows operators to make a pre-compaction pass to chart ground conditions. The pass determines the properties of the material to be compacted and also will reveal weak areas before rolling starts.
For preparation at the office, before machines are even sent to a job site, Dynapac’s CompBase software provides detailed compaction planning and production information for Dynapac machines on a wide range of unbound materials. A project manager can input the machine model, material type, its thickness and the degree of compaction desired and CompBase will help determine the compaction effort necessary to achieve it, recommend amplitude settings, rolling speed and number of passes for optimum performance.
The software also provides information on the expected depth effect and density that should be achieved after any given number of passes. Optimizing compaction effort, Cheney said, saves fuel for lower cost-per-compacted yard and reduces overall environmental impact.
Performance Stage
During compaction, or the performance stage, the Dynapac compaction meter and compaction analyzer present continuously updated information to the operator’s display screen. Cheney said the operator always sees the density of the material being compacted and the exact position of the roller in relation to a selected reference line and can direct additional compaction energy to specific areas as required.
The Dynapac CA rollers in this mid-range class have static linear loads of 140 to 250 lb./in. (25 to 45 kg/cm) with amplitudes of 2.0 or 1.8 mm / 0.8 mm. Cheney said the optimization of each machine’s linear load relative to the vibratory force applied maximizes depth effect, meaning higher volume capacity for compaction with fewer passes. An added benefit of equipping the roller with Dynapac’s compaction meter is the new “active bounce control,” which stops unnecessary wear on the roller and prevents material damage from over-compaction.
Validation Stage
Dynapac’s documentation system stores information from the compaction analyzer (DCA-S) for later analysis. Performance efficiency can be studied back in the office. High quality documentation can be generated for quality assurance and acceptance inspection requirements. Results from quality control can be collected together in one system using data from the acceptance inspection.
Engine, Operating Cost
Engine offerings for the CA2500 through CA4000 rollers vary by size but include the customer’s choice of either Cummins four- or Deutz six-cylinder diesels, both interim Tier IV certified. These machines feature Dynapac’s innovative cross-mounted engine with easy-open hood to provide unparalleled service and maintenance access.
Customers who choose the anti-spin traction package will benefit from the Dynapac ECO mode fuel saving system, ensuring that the roller does not consume more power than needed at any time. ECO mode minimizes both fuel consumption and CO2 emissions.
For more information, visit www.dynapac.us.
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