Accelerated Polishing Machine

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

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 Skid Tester, also supplied by Cooper-Wessex), to determine a Polished Stone Value (PSV).
Fourteen specimen aggregate samples are clamped around a rotating Road Wheel. These samples are subjected to two timed stages of abrasive polishing under a loaded rubber tyre. First by Corn Emery grit, and secondly by Flour Emery powder.
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.


Standards

  • EN 1097-8:2009 (formerly BS 812 pt114: 1989)
  • ASTM E303-93
  • ASTM D3319-99
  • 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 Use

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

  • Road Wheel Speed 320 ± 5 rev min -1
    Tyred Wheel Set Diameter mm 200 ± 3
    Tyred Wheel Set Width mm 38 ± 2
    Tyred Wheel Hardness (69 ± 3) mm IRHD
    Applied Load on the Wheel (725 ± 10) Newton
    Electrical Supply 230v/110v. 50/60 Hz Single Phase 13amp
    Dimensions mm (WxDxH) 810 x 790 x 1230
    Water Tank Height cm 155
    Palletised Dimensions mm (WxDxH) 1200 x 800 x 1280
    Weight (max) Kg 210
    Volume cubic meters 0.79
    Calibration & Maintenance

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

    Accessories are not included in the price of main device (unless stated otherwise) and may be purchased separately if required.

    Photo? N.A CRT-APM-886
    Base Plate
    Photo? N.A CRT-APM-SAMP
    Reference Sample – Moulded Criggion – Olivine Basalt
    Photo? N.A CRT-S882/190
    Corn Emery 25Kg Bags (Graded)
    Photo? N.A CRT-S882/191
    Flour Emery 25Kg Bags (Graded)
    Photo? N.A CRT-APM-S882/200
    Control Stone 25Kg Bags (Ungraded)
    Photo? N.A CRT-APM-S882/201
    Criggion Stone 25Kg Bags (Ungraded)
    Photo? N.A CRT-APM-S882/7
    Road wheel assembly
    Photo? N.A CRT-APM-S882/1022
    Corn Feeder 24 Volt
    Photo? N.A CRT-APM-S882/1023
    Flour Feeder 24 Volt
    Photo? N.A CRT-APM-S882/0049
    Weight BS EN 1097-8:2000
    Photo? N.A CRT-APM-S882/0049/ASTM
    Weight American Standard
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