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.
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 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.
The Double Wheel Tracker can be used as part of your Superpave performance based testing program.
Sheet steel, powder coated. Trasparent sliding doors.
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 adjustable in 100 N steps from 700 to 1500 N (for 77-PV33D05-06 only). The system includes a motorized lifting system of 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 over a range of 25 to 70°C ± 1.0°C, whilst the EN requires either air or water environment. In both systems 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. All versions fully satisfy and exceed the above requirements: the temperature accuracy is ±0.5°C.
Temperature controlled cabinet
The Universal AASTHO/EN versions feature an inbuilt temperature controlled cabinet for testing in air or in water, designed to avoid condensation problem (in water testing) and prevent overtemperature which may damage the mechanical parts or alter the transducer accuracy. Furthermore the system ensure thermal stability and provides rapid test start when the conditioned temperature has been reached.
Impression measurement system
Each wheel is fitted with linear transducer measurement system for deformations 0 to 50mm ±0.01mm.
EN 12697-22‰AASHTO T324
|Models||78-PV33B05 78-PV33D05 (1500 N)|
78-PV33B06 78-PV33D06 (1500 N)
|Standards||AASTHO T324 / EN 12697-22 / TEX-242-F|
|Testing mode||In air and water|
|Description||DWT, Hamburg and EN type, double wheel tracker, interchangeable wheels (steel for AASTHO and rubber for EN), wet and dry conditioning|
|Material and dimensions (diameter per width) of the two loaded wheels||Stainless steel 203x47 mm|
Rubber tyre 203x50 mm
|Temperature control method (accuracy ±0.5°C for both water and air)||Air: Three 1200 W electronically controlled air blowers|
Water: Three 1500 W heaters, re-circulating pump, automatic feed and control level
|Power rating||5500 W|
DWT Wet and Dry double wheel tracker. Conforming to AASHTO T324 and EN 12697-22 Small Size Device, air and water conditioning. Complete with both stainless steel and rubber wheels, PC, software and transparent sliding doors. 380V/50Hz/3ph+N
DWT Wet and Dry double wheel tracker. Conforming to AASHTO T324 and EN 12697-22 Small Size Device, air and water conditioning. Complete with both stainless steel and rubber wheels, PC, software and transparent sliding doors. 220V/60Hz/3ph
78-PV3/001: Set of two moulds 400x300 mm for PAVELAB DWT Double wheel tracker 78-PV3UP10: System for the independent lifting of the loading wheel at the rut target, continuing the test, without interruption, with the other wheel. 78-PV3UP20: Couple of additional temperature probes for monitoring the two samples temperatures. 78-PV3UP40: Upper closing panel made from transparent plastic for DWT machine 78-PV3/002: Set of two moulds 360 x 300 mm (suitable for 320x260 mm slabs) for PAVELAB DWT Double wheel tracker78-PV33D05:
DWT Wet and Dry double wheel tracker, to AASHTO T324 and EN 12697-22, air and water conditioning. Wheel load adjustable up to 1500 N. Complete with stainless steel and rubber wheels, PC, software and transparent sliding doors. 380V/50Hz/3ph+N
DWT Wet and Dry double wheel tracker, to AASHTO T324 and EN 12697-22, air and water conditioning. Wheel load adjustable up to 1500 N. Complete with stainless steel and rubber wheels, PC, software and transparent sliding doors. 220V/60Hz/3ph
: 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) 78-PV3/011: Set of two moulds 400x300 mm for PAVELAB DWT Double wheel tracker model 77-PV33D05 and 77-PV33D06, maximum sample height 120mm 78-PV3/012: Set of two moulds 360x300 mm for PAVELAB DWT Double wheel tracker model 77-PV33D05 and 77-PV33D06, maximum sample height 120mm 78-PV33B00/CAL:
Set of traceable calibration certificates for 78-PV33xxx air and water conditioning wheel tracker (including load, two displacement transducers, wheel speed/frequency, tyre hardness - if applicable, air temperature and water temperature).
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