Main Features
- Full conformity to AASHTO T324-19, including sinusoidal movement (RMSE certificate available on request) and rut depth measurement in 11 defined points
- Full conformity to TxDOT TEX-242-F specifications
- 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 50 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 360×300 mm (for 320×260 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
- The software includes the possibility to program pre-heating and machine start (without operator intervention) and to measure the rut depth measurement in user-defined positions for research purposes or local specifications
Description
The DWT Hamburger type Double Wheel Tracker can be used as part of your SuperPave performance based testing program.
This testing helps assess the performance and durability of asphalt mixes, aiding in the design and optimization of pavement materials for long-lasting and safe road infrastructure.
We offer the Hamburg Type Double Wheel Tracker but also offer devices conforming to EN 12697-22 Standard as well as a Universal version conforming to both AASHTO and EN Standards. (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 transparent sliding doors, water bath covers and automatic water filling and levelling system.
Machine body
Sheet steel, powder coated. Transparent 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 molds 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 deformations from 0 to 50 mm ±0.01 mm.
Technical Specs
- 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-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 203×47 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 |
Accessories
Independent Lifting System
| 78-PV3UP10 | System for the independent lifting of the loading wheel at the rut target, continuing the test, without interruption, with the other wheel. |
Temperature Probes
| 78-PV3UP20 | Couple of additional temperature probes for monitoring the two samples temperatures. |
Mould and Tray Sets
| 78-PV3/002 | Set of two moulds 360 x 300 mm (suitable for 320×260 mm slabs) for PAVELAB DWT Double wheel tracker |
| 78-PV3/003 | Set of two mould adaptors for 150mm dia. cylindrical sample, to be used with 360 x 300 mm, 400 x 300 mm moulds or with trays |
| 78-PV3/005 | Set of trays with handles for 150 mm diameter cylindrical samples, conforming to AASHTO T324. Adaptors for 150 mm dia. cylindrical sample to be ordered separately (see accessory 77-PV3/003) |
Additional Covers
| 78-PV3UP30 | Set of 2 covers for 77-PV31A1x water bath |
| 78-PV3UP40 | Upper closing panel made from transparent plastic for DWT machine |
Calibration Certificates
| 78-PV31A00/CAL | Set of traceable calibration certificates for 78-PV32xxx or 78-PV31XXX wheel tracker (including load, two displacement transducers, wheel speed/frequency, tyre hardness -if applicable, air or water temperature). |
