Spotlight on Pavement Density: Minnesota Department of Transportation - Working with Dielectric Profiling Systems
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Spotlight on Pavement Density: Minnesota Department of Transportation - Working with Dielectric Profiling Systems

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  • Corporate Creators:
    United States. Department of Transportation. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-HIF-21-040
  • Resource Type:
    Brief
  • Right Statement:
    Public Domain
  • Geographical Coverage:
    United States;Minnesota
  • Corporate Publisher:
    United States. Department of Transportation. Federal Highway Administration
  • Abstract:
    The Minnesota Department of Transportation (MnDOT) began evaluating dielectric profiling systems (DPS) in 2016 as one of the agency's several efforts to explore new technology to improve compaction quality control (QC) and agency acceptance for asphalt pavement. DPS use ground-penetrating radar (GPR) technology to measure dielectric constant of hot-mix asphalt (HMA) pavement. The measured dielectric constant can be related to the density, a key indicator for pavement performance. MnDOT participated in the DPS Assistant Program under the second Strategic Highway Research Program (SHRP2) RO6C and has demonstrated that DPS can be used effectively to assess HMA compaction and uniformity. MnDOT’s goal for DPS is to obtain a more complete picture of in-place air voids in the newly placed asphalt mixture than through its current practice of cutting sample cores from random locations. "We see DPS as the final piece of the puzzle of getting expanded assessment of our placed pavement," says Kyle Hoegh, a research scientist for MnDOT. Hoegh and Shongtao Dai, who both work in the MnDOT Office of Materials and Road Research, say studies show that DPS is an effective tool for QC and agency acceptance in asphalt pavement compaction. Once the DPS tool is implemented for future construction projects, the MnDOT team hopes to reduce the number of sample cores typically pulled per project.
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