NCHRP project 20-07/task 361 : hamburg wheel-track test equipment requirements and improvements to AASHTO T 324 : research project capsule.
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NCHRP project 20-07/task 361 : hamburg wheel-track test equipment requirements and improvements to AASHTO T 324 : research project capsule.

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  • Creators:
    Mohammad, Louay
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Subject/TRT Terms:
  • Publication/ Report Number:
    14-3B
  • Resource Type:
    Brief
  • Geographical Coverage:
    Louisiana
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    The Loaded Wheel Test (LWT) is a laboratory-controlled rut depth test that uses loaded wheel(s)

    to apply a moving load on hot-mix and warm-mix asphalt (HMA and WMA) specimens to simulate

    traffi c load applied on asphalt pavements. In the 1970s Helmut-Wind Incorporated proposed

    a test method and developed specifi cations requirements to measure the combined eff ects

    of rutting and stripping susceptibility. The equipment developed was named the Hamburg

    Wheel Tracking Device (HWTD) and has been used for over four decades worldwide. The HWTD

    measures the combined eff ects of rutting and moisture damage (stripping) by rolling a steel wheel

    across the surface of an asphalt concrete slab that is immersed in a temperature-controlled water

    bath. The interest and use of LWT in performance specifi cations, alternatively referred to as rut

    testers or torture testers, has seen an increase in recent years. This interest can be attributed

    to several factors, including the use of such devices by FHWA and many state Departments of

    Transportation (DOTs). Other important factors in this increased popularity are the ease of use

    and good correlation to fi eld performance, which led many DOTs to incorporate LWT tests in their

    specifi cations as a pass or fail acceptance criteria.

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