General Description

The wheel tracking test is used for determining the susceptibility of Hot Mix Asphalt (HMA) to deform under load by measuring the rut depth formed by...
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Description

The wheel tracking test is used for determining the susceptibility of Hot Mix Asphalt (HMA) to deform under load by measuring the rut depth formed by repeated passes of a loaded wheel at a fixed temperature.  Two versions available as prescribed by EN 12697-22 Small Size device: specimen conditioning in air and in air or water.
Both versions can be upgraded with automatic  system which lift one of the wheel from the specimen that has reached the rut target continuing the test on the other specimen. See Upgrading options Automatic wheel lifting mechanism.
We also produce Wheel Trackers conforming to AASHTO T324 standard and a universal version conforming to both AASHTO and EN standards. See Hamburg type double wheel tracker and Universal AASHTO/EN double wheel tracker.

The DWT Double Wheel Tracker can be used as part of your Superpave performance based testing program.

Machine body
Sheet steel, powder coated. Trasparent sliding door.

Loaded wheel system
The EN versions are fitted with double solid rubber tyre, 203 mm dia. x 50 mm wide.
The wheel load is 700 N. The system includes a motorized lifting system for raising the wheel assembly at the end of the test.

Wheel tracking carriage
The wheel is moved 230 mm backwards and forwards on the top of the slab, which is fixed. The speed is adjustable via the PC from 20 to 30 cycles per minute (40 to 60 passes). The longest slab dimension is oriented to the wheel's direction of travel. Special slab moulds for circular samples obtained from coring or gyratory compactors are also available. See accessories.

Temperature control system
The EN prescribes either air or water environment. A water level of about 20 mm above the sample has to be maintained. Where a heated air environment is specified, the specimen, during testing, must be maintained at uniform and constant specified temperature ± 1°C. The DWT Double Wheel Trackers fully satisfy and exceed the above requirements: the temperature accuracy is ± 0.5°C.

Impression measurement system
Each wheel is fitted with RUT DEPTH transducers for measuring deformationsfrom 0 to 40 mm ±0.01 mm.

Products

Code
Description
Units

Technical Specifications

  • Displacement motion: the arm is moving and the carriage is fixed
  • Wheel travel: 230 mm
  • Wheel speed: variable from 20 to 30 cycles/min
  • Wheel load: 700 N
  • Temperature range: ambient to 80°C, ± 0.5°C 
  • Rut depth transducer range: 50 mm, 0.01 mm accuracy
  • Moulds: not included, to be ordered separately
  • Slab thickness: adjustable from 40 to 100 mm in 10 mm steps
  • Overall dimensions (w x d x h): 1540x1020x1600 mm
  • Weight approx.: 600 kg
  • PC and software: included
Models 78-PV32E05 78-PV33E05
Standards EN 12697-22 EN 12697-22
Testing mode In air In air and water
Description DWT Double Wheel Tracker, dry conditioning version DWT Double Wheel Tracker, wet and dry conditioning version
Material and dimensions (diameter per width) of the two loaded wheels Rubber tyre 203x50 mm Rubber tyre 203x50 mm
Temperature control method (accuracy ±0.5°C for both water and air) Three 1200 W electronically controlled air blowers Air: three 1200 W electronic controlled air blowers
Water: three 1500 W heaters, re-circulating pump, automatic feed and control level
Power rating 4600 W 5500 W

 

Standards

  • EN 12697-22

Accessories and Spare Parts

Code
Description
Units

Videos

DWT Double Wheel Tracker — How-to determinate asphalt deformation (rutting) test IN AIR - EN 12697-22