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.  We also produce  Wheel Trackers conforming to EN 12697-22 standard and a Universal version conforming to both AASHTO and EN Standards. See Double Wheel Tracker, EN versions and Universal AASHTO/EN Double Wheel Tracker.
Two versions are available with full access to the water bath or complete with clear trasparent sliding doors, water bath covers and automatic water filling and leveling system.

The DWT Hamburger type 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 wheel load is 705 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 AASHTO Hamburg type Standard states that the test must be performed in a water bath with a temperature range of 258 to 70° ±1°C. 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: 705 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-PV31A16     78-PV31A26
78-PV31A15     78-PV31A25
Standards AASHTO T324, TEX-242-F
Testing mode In water
Description DWT Hamburg type Double Wheel Tracker, wet conditioning version
Material and dimensions (diameter per width) of the two loaded wheels Stainless steel 203x47 mm
Temperature control method (accuracy ±0.5°C for both water and air) Three 1500 W heaters, re-circulating pump, automatic filling and control level*
Power rating 5500 W

*Models 77-PV31A26 and 77-PV31A25 only

Standards

  • AASHTO T324
  • TEX-242-F

Accessories and Spare Parts

Code
Description
Units

Videos

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