Automatic Wehner/Schulze Friction Test Device

Complete laboratory testing device for skid resistance prediction and polishing resistance of asphalt, concrete and aggregates by Wehner/Schulze method according to EN 12697-49:2014

After many years of research work in different Universities and material testing institutes a new FAP device is developed, which includes the conclusions of experiences and results.
APS didn´t change the original technical measuring concept, but modernized and optimized the technicalcomponents and handling of the system according to international technical requirements and industrial standards in mechanics, electronics and software solution.
Extensive comparative studies were carried out for clear comparison with the results of the previous models.

 


Main features for model FAP 1000:

  • Polishing station with polishing rolls (original technical concept)
  • Better function of pump and mixing system for abrasive-water-mixture 
  • Skid resistance measuring station (original technical concept) with new developed high accuracy torque measuring system
  • Combined fully automatic test procedure for polishing and skid resistance measuring
  • Stainless steel construction for long lifetime and corrosion protection
  • New corrosion resistant temperature control system
  • High quality industrial controller with touch panel and graphic display for simultaneous monitoring of measured values and test procedures
  • Different control modes and functions with graphic output are available
  • Programmable test cycles for polishing, cleaning and measuring procedures, including definition of traveling speed of test table
  • Control, data acquisition, monitoring and test report with advanced software solution for windows 10
  • Different moulds for mounting the samples in the Wehner/Schulze test device available

The following settings are included for the polishing process:

  • Fully automatic test procedure
  • Speed of the polishing head typically: 500 rpm
  • Selectable number of overrollings (typically: 90.000)
  • Constant temperature control for abrasive-water-mixture (typically 14 +/- 2°C)
  • Constant load for polishing head with 392 +/- 3 N
  • Flow rate of the water/quartz flour mixture of 5 l/minemperature control of the water/quartz flour mixture from +5 to +40 °C (typically 8 - 16 °C)

 

The following test parameters are includes for the test process:

  • Fully automatic test procedure
  • Test Freely selectable discharge speed (test start) of the test head, from 0 - 100 +/-5 km/h
  • Flow rate of the test water typically: 20 l/min
  • Constant test load of 253 +/- 3 N (weight of the test head)

 

Dimension including electronic cabinet and 

abrasive mixture station (HxWxD)

2500 x 2600 x 1200 mm
Power supply 400 VAC (3Phase) / 16 A
Weight

1.800 kg

(Machine 1.500 kg, Control box 300 kg)

Environmental condition

+5 to +40 °C,

max. 40% rel. humidity

 

Technical requirements:

  • Compressed air for 6 mm nozzle, min. 6 bar
  • Water supply, min. 2-3 bar
  • Water drain system (pipes or underground) Ø 50 mm, max. 150 mm above floor level
  • Electrical connection: 400 VAC, 3 Phase

 

Technical specifications for research model FAP 1000-R

The following setting options are available for the polishing process:

  • Manual, semi-automatic and fully automatic control of test procedures
  • Freely selectable speed of the polishing head, from 0 - 600 min-1 (typically: 500 min-1)
  • Unlimited (max. 2 millions) settings of overrollings (typically: 90,000)
  • Flow rate of the water/quartz flour mixture between 0 – 30 l / min (typically: 5 l/min)
  • Selectable temperature with control of water/quartz flour mixture from 5 - 40 °C (typically 20 +/- 2°C) with 0.1 degree accuracy
  • Load of polishing head 392 +/- 3 N (optional changeable) 

 

The following setting options are available for the skid resistance measuring test process:

  • Manual, semi-automatic and fully automatic control of test procedures
  • Freely selectable discharge speed (test start) of the test head, from 0 - 105 km/h
  • Flow rate of the test water between 5 - 30 l/min (typically: 20 l/min)
  • Selectable temperature with control system of test water between 5 - 40 °C (typically: 14 +/- 2°C) with 0.1 degree accuracy
  • Load of test head for skid resistance measurement 253 +/- 3 N (optional changeable)
  • Measurement of torque with an accuracy of 0.05% or better 0.025 Nm

 

Supplied with following equipment:

  • Testing machine with polishing and skid resistant measuring testing station, as well as supply units in the substructure
  • Control cabinet, upper section with control panel (touch), Ethernet/PC interface, control and safety devices
  • Incorporated container in the lower section for quartz flour/water treatment and pump
  • 1 set of rubber inserts (1 set = 3 pieces)
  • 1 set of polishing rolls (1 set = 3 pieces)
  • 1 bag of 10 kg quartz flour
  • Not available
  • Not available
  • Detailed information will follow soon
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