The Hamburg (Immersion) wheel tracking test is used to evaluate the resistance to rutting and moisture susceptibility of asphalt mixtures. AASHTO-T324 is the generally referred to test standard, although many states modify this procedure to meet their specific requirements. Outside of the US both AASHTO-T324 and EN12697-22 are followed.
What differentiates the Hamburg wheel tracking from other wheel tracking methods is the use of water to condition the temperature of the specimens rather than air. It is believed that the water, in some tests, strips the aggregate which creates a tertiary phase that is distinct from the permanent deformation which occurs in dry wheel tracking tests. The use of stainless steel wheels on a weighted cantilevered arm, in conjunction with water has led some people to refer to Hamburg wheel tracking as a ‘torture test’. Certainly it is the case that less well constructed machines will shake to pieces due to the aggressive nature of the test. The Cox Hamburg Wheel Tracker is manufactured in California from thick solid stainless steel. Painted steel panels and parts are not an option for the Hamburg test. Our Hamburg Wheel Tracker is built to last decades not just a couple of years, which is why it comes with a five year warranty.
A rigid frame construction is also essential for accurate results. Cheaply produced machines will flex and vibrate with deeper rut depths. Quality of machine and quality of test results go hand in hand.
The Cox Hamburg Wheel Tracker will output more precise and accurate results than any other Hamburg machine – guaranteed.
- Fully complies with AASHTO T-324, STATE STANDARDS, EN 12697-22 and other national standards where relevant
- The stiffess, most rugged and accurate Hamburg
- Full stainless steel
- Includes Research software
- Proudly made in the USA
- 12 month warranty
|Wheel Speed||Variable between 15 and 30 cycles (30 to 60 passes) per minute|
|Wheel Load||705 ± 4.5N (158 ± 1.0lbf)|
|Variable Speed Range RPM||15 to 30|
|Slab Thickness mm (inch)||50 – 100 (2-4) (different thicknesses can be tested with spacers)|
|Rut Depth Transducer Range mm (inch)||50 (2)|
|Temperature Range °C (°F)||Ambient to 70 (158)|
|Electrical Supply||1 Ph 208-230 V 50/60 Hz (others available)|
|Dimension (WxDxH) mm (inch)||1430 x 1380 x 1260 (57 x 55 x 50)|
|Estimated Weight Kg (lb)||687 (1520)|
- Accuracy of results 100% 100%
- Meets AASHTO-T234 100% 100%
- Meets EN 12697-22 100% 100%
- Made in America 100% 100%