General Info

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The CRT-WTEN1 and CRT-WTEN2 are supplied with a UKAS certificate of accreditation validating conformance to EN 13108

Wheel tracking is used to assess the resistance to rutting of asphaltic materials under conditions which simulate the effect of traffic. A loaded wheel tracks a sample under specified conditions of load, speed and temperature while the development of the rut is monitored continuously during the test. Test specimens can be either slabs prepared with a laboratory compactor or 200mm Ø cores cut from the highway.

The CRT-WTEN1 wheel tracker performs both procedures A and B specified for the small scale device in EN 12697-22. Procedure A requires that six specimens are tested. For procedure B only two specimens need to be tested, but rut depth must be measured at more points along the longitudinal rut profile. To speed up the testing process the CRT-WTEN2 was designed to test two specimens simultaneously.

Standards

  • EN 12697-22 Small device
  • AGPT/T231 (supersedes AST 01)
  • BS 598-110:1998

Key Features

  • Tests materials for roads with axle loads up to 13 tonnes
  • Rigid test frame built from extruded aluminium section
  • Integral temperature controlled cabinet with double glazed doors
  • PID control of test temperature in the range 40°C to 62°C
  • Rack for pre-test temperature conditioning of specimens
  • The CRT-WTEN2 tests two specimens simultaneously
  • Specimens compacted with the Cooper Technology Roller
  • Compactor can be transferred directly to the wheel tracker without de-moulding
  • Closed-loop speed control
  • User-friendly Windows™ software
  • 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 Small device
  • Software automatically starts the wheel tracker, maintaining the speed at the specified 26.5 cycles per minute
  • Measures rut depth and sample temperature automatically at regular intervals
  • The rut profile is captured automatically by the software and analysed to calculate the rut depth
  • A continuously updated on-screen graph shows rut depth versus time, along with the rut profile and temperature
  • Software stops the wheel tracker on completion of a test and prints a test report if required
  • 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

Specifications:

Wheel Load700/520N
Mould Dimensions mm305 x 305mm (others available)
Wheel Speed26.5 cycles per minute
Slab Thickness mm ¹40 to 100mm
Rut Depth Transducer Range mm50
Temperature Range40 to 60°C
Electrical SupplySingle 220-240 Volts 50/60 Hz @ 13A (others available)
Dual 220-240 Volts 50/60 Hz @ 16A (others available)
Compressed AirDual 7-10 bar @ 600 L/min
Dimensions mm (W x D x H)Single 1579 x 840 x 1740
Dual 1750 x 1090 x 1970
Working space required mm (WxDxH)Single 1680 x 1840 x 1940
Dual 1850 x 3090 x 2070
Weight (approx.) KgSingle 448
Dual 500
PCIncluded

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