Wheel Tracker Large Device

Optimisation of the wheel tracking test time and result accuracy through computerised control

Wheel tracking is used to assess the resistance to rutting of asphaltic materials under conditions which simulate the effect of traffic. In this machine, two 500x180mm specimens are tested simultaneously by tracking with wheels fitted with pneumatic tyres under specified conditions of load, speed and temperature while the development of the rut profile is monitored at specified intervals during the test. The moulded specimens are inserted and removed from the wheel tracker using an Easy-load system.

The Wheel Tracker Large Device CRT-WTENLD supersedes the French Pavement Rutting Tester by using a unique instrumented measurement device, linked to the data acquisition, to measure the development of rutting during testing. It allows extreme efficiency compared to any other type of devices of its type. The test procedure and conditions are controlled and data acquired using Windows™ software running on a host computer via a high speed digital interface and signal conditioning system.


  • EN 12697-22 Large device
  • NF P98-253-1
  • Key Features

  • Tests materials for roads with axle loads of at least 13 tonnes
  • Unique rut profile measurement device linked to data acquisition system
  • Integral temperature controlled cabinet
  • Test temperature range 40 to 60°C
  • Tests for specified number of cycles or to specified rut depth
  • Double glazed doors for viewing test
  • Easy-load system for specimen handling
  • Conditioning of specimens at test temperature
  • User friendly Windows™ software
  • Automatic test start/stop
  • Closed loop speed control
  • Specimens can be compacted in the CRT-RCENLD-II and then wheel tracked without de-moulding
  • Supplied with certification of a UKAS accredited calibration

  • Key Use

  • Determination of the rut resistance of asphaltic paving materials

  • Software

  • User friendly, intuitive and reliable Windows™ software developed using LabVIEW™
  • Software is designed to perform EN 12697-22 Large device
  • Integrated acquisition system for data capture and machine control
  • Software automatically starts the wheel motion and brings the specimens up into contact with the moving wheels
  • Rut depth of both specimens is monitored according to the procedure specified in the standard
  • Three linear displacement transducers are housed in a frame which slides over the moulds on each side of the machine
  • The frame is positioned at five pre-determined measurement points to allow a total of 15 rut readings to be automatically captured by the software
  • Readings are automatically stored and on-screen graphs show rut development as well as historical rut data. The acquired rut data is also saved to disk
  • Software stops the wheel tracker on completion of a test and prints a test report if required
  • The stored test data can be analysed and compared with other test data utilising a spreadsheet package
  • Utilities are included for transducer check, diagnostic routines and RTD calibration
  • Wheel Tracker Large Device software

    Wheel Load 5kN
    Mould Dimensions mm 500 x 180
    Wheel Speed 1 Hz
    Slab Thickness mm ¹ 50 to 100 mm (other sizes available)
    Rut Depth Transducer Range mm 25
    Temperature Range 40 to 60°C
    Electrical Supply 3 Phase 415 Volts @ 32A (other supplies available)
    Compressed Air 7-10 bar @ 600 L/min
    Dimensions mm (WxDxH) 1500 x 1400 x 1700
    Working space required mm (WxDxH) 5500 x 2400 x 1900
    Estimated Weight Kg 1054
    PC Included

    ¹ others available upon request

    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.

    Mould – Large Device Wheel Tracker/Roller Compactor 500 x 180 x 100mm deep
    Mould – Insert 500 x 180 x 50mm deep
    Lifting trolley specifically designed for use with the Roller Compactor and Wheel Tracker Large
    Replacement pneumatic tyre for Large Device Wheel Tracker/ Roller Compactor
    Replacement inner tube for Large Device Wheel Tracker/ Roller Compactor
    Valve Extender for tyre for Large Device Wheel Tracker/ Roller Compactor
    Please complete the form below to download the datasheet