The Servopac is a fully automated, servo-controlled, gyratory compactor designed to compact asphalt mixes by gyratory compaction. Compaction is achieved by the simultaneous actions of static compression and the shearing action resulting from the mould being gyrated through an angle about its longitudinal axis.
A number of ergonomic features have been designed into the Servopac to ensure operator safety and minimise manual handling of the hot and heavy asphalt-filled moulds. The mould slides from a bench, directly into the compaction chamber, and following compaction, to the pneumatically operated specimen extraction device, thus eliminating any lifting. The compaction chamber is completely enclosed, and the access door is fitted with safety glass to allow the operator to view the compaction process. The door closes and opens automatically and a safety interlock prevents the machine from operating while it is open. An emergency stop button is provided.
The Servopac has a four column frame for increased rigidity. Vertical stress is measured by a load cell and is accurately controlled during compaction. The gyratory motion is also servo-controlled, enabling the gyratory angle to be accurately controlled during compaction, irrespective of load and minor flexing of the machine’s components. The servo-control operation of the machine allows the vertical stress, gyratory angle and speed to be quickly modified from a hand-held control pendant or PC.
The optional PC ‘Windows’ interface provides a screen to input test parameters and display and plot either height, density or angle against gyratory cycles in real time. Test data may be stored and retrieved or transferred to other software analysis packages. The Servopac is designed to comply with SHRP Superpave asphalt mix design requirements.
For accurate, parallel trimming, of the compacted specimen ends see IPC Auto-Saw.
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