Controls Group http://www.controls-group.com/images/logo_controls.gif DWT Hamburg type Double Wheel Tracker DWT Hamburg type Double Wheel Tracker
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Asphalt/bituminous mixture

DWT Hamburg type Double Wheel Tracker

The Hamburg Wheel Tracker with unique solutions to perform reliable tests

  • DWT Hamburg:
AASHTO T324
Main features
  • Meets and exceeds AASHTO standards and many DOT methods
  • Fully automatic test performance on two specimens or one specimen
  • Variable wheel speed from 20 to 30 cycles/min
  • Fixed table, mobile wheel 230 mm travel
  • Wheel load of 705 N
  • Temperature range from ambient to 80°C (±0.5°C)
  • Accurate temperature control (±0.5°C) for both in water test
  • Rut depth transducers feature 25 mm travel, 0.01 mm accuracy
  • Direct rut depth measurement system, with transducers axially mounted in alignment with the wheel's centre
  • Motorized wheel-assembly lifting system for easy removal of slabs
  • Free access to the wide testing area
  • Optional independent lifting system for double or single wheel testing
  • Slab mould size of 360x300 mm (for 320x260 mm slabs), double 150 mm gyratory compactor cylinders, 200 mm/8"/10" diameter cores
  • Slab thickness adjustable from 40 to 100 mm (in 10 mm steps)
  • Extensive use of stainless steel in the machine's construction; not limited to the parts in contact with water
  • Automatic water filling and leveling system, no need to adjust or control the water level above the specimen during test
  • Possibility to add two optional temperature probes to monitor the two samples temperature
  • Laptop PC control with dedicated software including results performance, test database management and multiple test elaboration
General description
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 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.

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.
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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: 25 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
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

Ordering info

78-PV31A16
DWT double wheel tracker (Hamburg type). Conforming to AASHTO T324, in-water specimen conditioning. Complete with laptop PC and software. Set of moulds to be ordered separately (see accessories).
220 V, 60 Hz, 3 ph

78-PV31A15
As above but 380 V, 50 Hz, 3 ph

78-PV31A26
DWT double wheel tracker (Hamburg type). Conforming to AASHTO T324, in-water specimen conditioning. Complete with laptop PC and software and clear transparent sliding door. Set of moulds to be ordered separately (see accessories).
220 V, 60 Hz, 3 ph

78-PV31A25
As above but 380 V, 50 Hz, 3 ph

Accessories

78-PV3/002
Set of two moulds 360x300 mm (also suitable for 320x260 mm samples by using 20 mm thick plaster spacers), thickness variable from 40 to 100 mm. For tests conforming to AASHTO T324 in water.

78-PV3/003
Set of two mould adaptors for double 150 mm dia. core (total 4 adaptors made of special self lubricating acetal copolymer), thickness 60 mm, fitted in 77-PV3/002 360x300 moulds (not included). For tests conforming to AASHTO T324 in water.

78-PV3/005
Set of trays with handles for double 150 mm diameter cylindrical samples. 77-PV3/003 adaptors for 150 mm dia. cylindrical sample to be ordered separately. For tests conforming to AASHTO T324.

Upgrading

To be specified at time of order

Lifting system
78-PV3UP10

System for the independent lifting of the loading wheel at the rut target, contining the test, without interruption with the other wheel.

Additional temperature probes
78-PV3UP20

Additional two temperatures probes to monitor the two sample temperatures.

Water tank cover
78-PV3UP30

Water tank covers, only for 77-PV31A16/5 models.

Documents

Technology communication