Asphalt Wheel Tracker
Hamburg Wheel-Tracking Test

The GCTS Hamburg Wheel-Tracking Tester (HWTT-100) was designed to easily perform the Hamburg Wheel-Tracking Test according to AASHTO T 324 and EN 12697-22 testing standards. This system utilizes a water bath for temperature control of the two specimens, which can be tested simultaneously. 


The HWTT-100 does not use a cantilever arm for application of the vertical load, like most other companies. Instead, the load is applied directly above the specimen at all times, resulting in the most accurate and reliable system on the market!

The HWTT-100 directly applies the vertical load to the specimens during testing. Most other systems use a weighted cantilever arm to apply the vertical load, resulting in excessive vibrations and an inability to accurately measure the vertical load. The GCTS system instead utilizes a mobile frame to keep the load directly above the loading wheel and dampeners to prevent vibration of the frame during horizontal movement. With this setup, you can be confident that the load stays at 705N (+/- 4.5N) for the duration of the test.


The HWTT-100 meets all the specifications of AASHTO T 324 and EN 12697-22. Tests can be performed with either stainlesss steel or rubbarized testing wheels, which can be interchanged as needed.

System Specifications:

  • 705N +/- 4.5N constant load
  • Water bath for temperature control up to 70°C
  • Temperature control +/- 0.5°C
  • Stainless steel or rubberized wheels
  • Two wheels for simultaneous testing of two specimens



Relevant Standards

  • AASHTO T 324 Standard Method of Test for Hamburg Wheel-Track Testing of Compacted Asphalt Mixtures
  • EN 12697-22 Bituminous mixtures - Test methods for hot mix asphalt - Part 22: Wheel tracking