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Asphalt/bituminous mixture

PAVELAB DWT Universal AASHTO/EN double wheel tracker

The PAVELAB DWT UNIVERSAL Double Wheel Tracker performing both AASHTO Hamburg Type and EN tests, with unique solutions for the maximum accuracy and reliability

EN 12697-22 | AASHTO T324
Main features
  • Meets and exceed AASHTO and EN standards
  • Two versions: wheel load 700/705N and adjustable up to 1500N
  • For testing both in water and air
  • Massive use of stainless steel in the machine construction, not limited to parts in contact with water
  • PC interface
  • Double wheel with single wheel testing option
  • Heating stability, speed and precision up to 80 ± 0.5°C
  • High accuracy (± 0.5°C) temperature control for both water and air environment
  • Motorized lifting system of the wheels assembly for easy removal of slabs
  • High accuracy and resolution (0.01mm) rut depth and profile monitoring system
  • Direct rut depth measurement system, axially mounted in alignment with the wheel's centre, at frequency of 80Hz.
  • Inbuilt temperature controlled cabinet for testing in air or in water designed to:
    • ​avoid condensation problem (in water testing) and prevent overtemperature which may demage the mechanical parts or alter te transduecer accuracy
    • allow the test area to be open and visible during the test execution
    • ensure thermal stability and provide rapid test start by fast initial temperature increase, and automatic test start when the conditioning specimen temperature has been reached
  • Independent lifting option system of the loading wheel at the rut depth target continuing the test, without interruption, with the other wheel
  • Slab mould capacity up to  400x300 mm. The greatest slab dimension is oriented as the wheel travel.
  • Laptop PC and software included
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.  The two methods  EN 12697-22 and Hamburg Type AASHTO T324, are practically identical except for:
-Test environment: Dry and Wet for EN and  Wet for AASHTO Standard
-Rubber Wheel dia. 203x 50 mm width EN and Steel wheel dia. 203x47 mm width AASHTO.
This universal version complies either to AASHTO or EN standards being equipped with both stainless steel and rubber wheels, and performing the test in air or water. This solution is particularly suitable for Central and research laboratories.
This  version 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 a model of Wheel tracker  conforming to AASHTO, and another model conforming to EN. See Hamburg type double wheel tracker and Double Wheel Tracker, EN versions.

Description
  • Machine body
Sheet steel, powder coated. Trasparent sliding door.
  • Loaded wheel system
This Universal model is fitted with double stainless steel wheel, 203 mm dia. x 47 mm wide, and double solid rubber tyre, 203 mm dia. x 50 mm wide.
The wheel load is 700/705 N (model 77-PV33B05) or adjustable up to 1500N (model 77-PV33D05). The system includes a motorized lifting system of the wheel assembly at the end of the test avoiding the use of obsolete hoists.
Both set of stainless and rubber wheels are supplied.

Wheel tracking carriage
The test specimens in their carriages are  moved 230 mm backwards and forwards under the loaded wheels in  a fixed horizontal plane. The speed is adjustable via PC from 20 to 30 cycles per minute (40 to 60 passes). The slab mounting system can hold specimens of 320x260 and 400x300mm, 38 to 100mm thick (38 to 120mm thick for 77-PV33D05 model). The greatest slab dimension is oriented as the wheel travel. Special slab moulds for circular samples from coring or gyratory compactors, are also available. See accessories.
  • Temperature control system
AASHTO Hamburg Type standard prescribe the test to be performed in a water bath over a range of 25 to 70°C ± 1.0°C, whilst the EN prescribe either air or water environment. In both systems a water level of about 20 mm above the sample has to be maintained. In case of air heat environment, the specimen, during testing, must be maintained at uniform and constant specified temperature ± 0.5°C.  All DWT versions fully satisfy and exceed  the above requirements: the temperature is maintained up to 80°C ±0.5°C.
  • Impression measurement system
Each wheel is fitted with linear transducer measurement system for deformations 0 to 50mm ±0.01mm.
  • Testing software
User friendly Windows® software. The operator can  set the (fully customizable) test execution conforming AASHTO or EN standards following in real time the test evolution: water (or air) temperature, specimen temperature, rut depth, and the graph deformation/cycles with the specimen profile, metric or Imperial unit selection. Export test data to CSV Format (Excel), file management concerning tests, asphalt mix, clients, etc.
  • Safety features
Display of the actual software setting concerning the selected temperature control system: water or air, giving the operator the possibility to check if the machine is mechanically set conforming to the standard in use.
The machine stops automatically opening the protection.
Air temperature overheating protection system.
Motor protection and other standard safety applications.
  • Standard outfit
The machine is supplied complete with laptop PC, Testing software. Set of moulds or trays to be ordered separately (see accessories).
More +

Technical specifications

Models
Conditioned
AASHTO/EN
In air and water
77-PV33B05
77-PV33B06
AASHTO/EN
In air and water
77-PV33D05
77-PV33D06
Two loaded wheels Stainless steel
Dia. 203x47 mm
Rubber tyre
Dia. 203x50 mm
Stainless steel
Dia. 203x47 mm
Rubber tyre
Dia. 203x50 mm
Displacement motion Fixed table
Moving wheel
Fixed table
Moving wheel
Wheel travel 230 mm 230 mm
Wheel speed Variable between
20 and 30 cycles
per minute
Variable between
20 and 30 cycles
per minute
Wheel load* 700/705 N by weights Adjustable from 700 to 1500 N (by 100 N steps) by weights
Temperature range Ambient to 80±0.5°C Ambient to 80±0.5°C
Temperature control
(accuracy ±0.5°C for both water and air )
Water: 3 x 1500 W heaters,
recirculating pump, automatic feed and control level.
Air: by air blower with 3 x 1200 W
heaters controlled by the electronic system
Water: 3 x 1500 W heaters,
recirculating pump, automatic feed and control level.
Air: by air blower with 3 x 1200 W
heaters controlled by the electronic system
Rut depth transducers range 50 mm 0.01 mm
accuracy
50 mm 0.01 mm
accuracy
Moulds for
Slabs dimensions
mm
(to be ordered separately)
400 x 300 mm
360 x 300 mm (two pieces) for 320 x 260 mm slabs (AASHTO)
Set of trays with handles for 150 mm diameter cylindrical samples
 (other available on request)
400 x 300 mm
360 x 300 mm (two pieces) for 320 x 260 mm slabs (AASHTO)
Set of trays with handles for 150 mm diameter cylindrical samples
 (other available on request)
Slab thickness Adjustable from
38 to 100 mm
Adjustable from
38 to 120 mm
PC and Software Included Included
Power rating 5500 W 5500 W
Overall dimensions  mm (lxdxh) 1540x1020x1600 1540
Weight  kg approx.: 600 600

*Special models available on request


Ordering info

Air and Water conditioned specimens

77-PV33B05
PAVELAB DWT Wet and Dry double wheel tracker,
conforming to Hamburg type AASHTO T324 and EN 12697-22 Small Size Device, in-air and in-water conditioning. Complete with both stainless steel and rubber wheels, laptop PC, software and clear trasparent sliding doors. Set of moulds to be ordered separately (see accessories). 380V/50Hz/3ph+N

77-PV33B06
PAVELAB DWT Wet and Dry double wheel tracker,
conforming to Hamburg type AASHTO T324 and EN 12697-22 Small Size Device, in-air and in-water conditioning. Complete with both stainless steel and rubber wheels, laptop PC, software and clear trasparent sliding doors. Set of moulds to be ordered separately (see accessories). 220V/60Hz/3ph

77-PV33D05
PAVELAB DWT Wet and Dry double wheel tracker.
Wheel load adjustable up to 1500N (by 100N steps). Conforming to Hamburg type AASHTO T324 and EN 12697-22 Small Size Device, in-air and in-water conditioning. Complete with both stainless steel and rubber wheels, laptop PC, software and clear trasparent sliding doors. Set of moulds to be ordered separately (see accessories). 380V/50Hz/3ph+N

77-PV33D06
PAVELAB DWT Wet and Dry double wheel tracker. 
Wheel load adjustable up to 1500N (by 100N steps). Conforming to Hamburg type AASHTO T324 and EN 12697-22 Small Size Device, in-air and in-water conditioning. Complete with both stainless steel and rubber wheels, laptop PC, software and clear trasparent sliding doors. Set of moulds to be ordered separately (see accessories). 220V/60Hz/3ph.

Accessories

Moulds

Moulds for model 77-PV33B05
77-PV3/001 Set of two moulds 400x300 mm, 38 to 100mm height
77-PV3/002 Set of two moulds 360 x 300 mm (suitable for 320x260 mm slabs), 38 to 100mm height

Moulds for model 77-PV33D05
77-PV3/011 Set of two moulds 400x300 mm, 38 to 120mm height
77-PV3/012 Set of two moulds 360 x 300 mm (suitable for 320x260 mm slabs), 38 to 120mm height

Adapters for both models
77-PV3/003 Set of two mould adapters for double 150mm dia. cylindrical sample, to be used with
                       360 x 300 mm moulds or with trays                                         
77-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 77-PV3/003)      

Note: other models are available on order

Upgrading

Lifting system
77-PV3UP10  System for the independent lifting of the loading wheel at the rut target, continuing the test, without interruption, with the other wheel.
Suitable for both models, to be specified at time of order.

Additional temperature probes
77-PV3UP20  Additional two temperature probes to monitor the two sample temperatures.
Suitable for both models, to be specified at time of order.

Documents

Partner's Documents