Lab Dielectric Measurement System for Asphalt Mixture Bulk Specific Gravity Determination

This project will develop a laboratory procedure for determining the bulk specific gravity of compacted asphalt specimens using dielectric constant measurements. Work in Stage 1 will focus on establishing the reliability and standardizing procedure for the Lab Dielectric Measurement System (LDMS), including an evaluation of the impact of specimen geometry, surface condition, and mix design variables on dielectric measurements. A design of experiments approach will be used to develop a material sampling plan for plant-produced asphalt mixtures. A survey will be administered to gather information on aggregate sources and planned mixture production from state DOTs and asphalt mixture producers. Data from previous and ongoing studies using dielectric profiling system (DPS) and LDMS will be collected for inclusion in the overall database. Sampling of plant-produced asphalt mixtures as well as component materials (aggregates, recycled asphalt pavement and binders) and mix design information will be conducted. Test specimens covering a range of densities, geometries, and surface characteristics will be prepared and their dielectric constants and bulk specific gravities measured. Necessary refinements to calibration and measurement procedures will be identified. Correlation curves between laboratory-measured bulk specific gravity and dielectric values will be developed. Statistical analysis will be conducted to evaluate the variability and repeatability of measurements and the significance of mixture properties on dielectric-specific gravity relationship. A draft AASHTO Test Specification will be developed for dielectric measurements of compacted asphalt specimens in the laboratory. In Stage 2, a relationship between dielectric value and bulk specific gravity will be established with the goal of replacing laboratory bulk specific gravity measurements with laboratory dielectric measurements. Component materials, such as aggregates, reclaimed asphalt pavement (RAP), and asphalt binder, sampled in Stage 1 will be tested using the LDMS. The collected data will be used to enhance existing models to develop and refine the relationship between laboratory-measured dielectric values and bulk specific gravities of compacted asphalt specimens.


  • English


  • Status: Active
  • Funding: $135422
  • Contract Numbers:

    Project 20-30, IDEA 229

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Jawed, Inam

  • Performing Organizations:

    University of New Hampshire

  • Principal Investigators:

    Sias, Jo

  • Start Date: 20210101
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01757151
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-30, IDEA 229
  • Files: TRB, RIP
  • Created Date: Nov 4 2020 10:36AM