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Accelerated Polishing Machine
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Accelerated Polishing Machine

The Cooper-Wessex Accelerated Polishing Machine CRT-APM is the industry standard device for the determination of the Polished Stone Value (PSV)

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Wessex Engineering first manufactured an Accelerated Polishing Machine, CRT-APM over 30 years ago, and were involved both in the development of the machine and the test procedures. Wessex has sold more than 1000 APMs globally.

In 1950 increased traffic flow and higher speeds, together with concerns about road safety led to research into the relationship between road materials and skid-resistance. Research at the UK Transport Road Research Laboratory showed a significant relationship between polishing of aggregates used in road surfaces and skid resistance. Tests were devised using an Accelerated Polishing Machine and a friction measuring device(known as the Pendulum, also supplied by Cooper-Wessex), to determine a Polished Stone Value(PSV).

As the best quality market leaders Cooper-Wessex have recently been copied by low quality manufacturers. Imitators’ machines may look similar, but precision, repeatability and reproducibility come only with years of experience.

Key Features

  • High ground steel main spindle running in precision sealed ball bearings additionally protected by a labyrinth seal spindle axially loaded to eliminate end play.
  • Adjustable 3 phase motor speed control with adjustable timing belt drive, reducing power consumption and improves control.
  • Inverter drive to motor for precise speed control
  • Digital display preset timer and revolution counter.
  • Robust welded steel mainframe, standing on adjustable pads
  • Specimens manufactured and easily removed from precision machined moulds.
  • 14 Specimens located on 'Road Wheel' by rubber rings and held by simple side fixing.
  • Tyred wheel easily removed for replacing tyres.
  • Water gravity fed from high level tank through calibrated flow meter.
  • Used abrasive and water collected in easily removable tray.
  • Loaded tyre raised and lowered to the running surface by mechanical lifting device.
  • Protection by covers and guards may be easily removed for maintenance.
  • CE marked.
  • ASTM option with pneumatic wheel.
  

Key Uses

  • To produce polished stone samples of aggregates used in road surfaces, to simulate actual road conditions.

Standards

  • EN 1097-8:2009
    (formerly BS812 pt114: 1989)
  • ASTM E303-93
  • ASTM D3319-99 

Calibration & Maintenance

Calibration, Annual Service and Maintenance Contracts are available for this device.
Please enquire for further details. Note: This device should be checked annually.