Determining asphalt content for recycled asphalt pavement (RAP) materials.
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

For very narrow results

When looking for a specific result

Best used for discovery & interchangable words

Recommended to be used in conjunction with other fields

Dates

to

Document Data
Library
People
Clear All
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Determining asphalt content for recycled asphalt pavement (RAP) materials.

Filetype[PDF-293.81 KB]


English
Details You May Also Like

Details:

  • Creators:
    Thompson, Gary
  • Corporate Creators:
    Oregon. Dept. of Transportation. Research Unit
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-OR-DF-04-02
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Oregon
  • Corporate Publisher:
    Oregon. Dept. of Transportation. Research Unit
  • Abstract:
    The State of Oregon uses significant amounts of Recycled Asphalt Pavement (RAP) in dense-graded mixes on State

    highways. The design process for these mixes relies on accurately knowing the amount of asphalt cement in the RAP

    materials being used. Beginning in 1997 ODOT began using ignition furnaces to determine RAP asphalt contents and

    gradations.

    Asphalt contents are determined by measuring the change in mass between the original dry RAP sample and the mass of the

    final residue aggregate sample after the asphalt is burned off in the ignition furnace. One shortcoming of the process is that

    a small portion of the aggregate is usually lost in the burning process. The amount of aggregate lost is on the order of 0.5%

    which may be considered significant for most RAP mixtures.

    This research attempted to use volumetric equations to solve for the RAP asphalt content by exploiting the constant nature

    of the Effective Specific Gravity of Aggregates, Gse. A solution is presented using a simplified equation which ignores the

    difference in Specific Gravity of Asphalt, Gb, between the RAP asphalt and the new added asphalt. This solution proved to

    be unstable and diverged significantly with only small changes in assumed Gb.

    A second more exact equation was derived to better account for the difference in Gb between the RAP asphalt and the new

    added asphalt. However, it’s analytic solution collapsed to zero due to the dependent nature of the volumetric equation

    being used. Attempts to derive a second linearly independent equation failed; however, future research may lead to a

    complete solution to this equation.

  • Format:
    PDF
  • Funding:
    304-221
  • Collection(s):
  • Main Document Checksum:
  • Download URL:
  • File Type:

Supporting Files

  • No Additional Files
More +

You May Also Like

Checkout today's featured content at rosap.ntl.bts.gov