Testing and analysis of LWT and SCB properties of asphalt concrete mixtures.
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

Testing and analysis of LWT and SCB properties of asphalt concrete mixtures.

Filetype[PDF-1.47 MB]


English
Details You May Also Like

Details:

  • Creators:
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Corporate Contributors:
    Louisiana. Dept. of Transportation and Development
  • Subject/TRT Terms:
  • Publication/ Report Number:
    Final Report 536
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Louisiana
  • Abstract:
    Currently, Louisiana’s Quality Control and Quality Assurance (QC/QA) practice for asphalt mixtures in

    pavement construction is mainly based on controlling properties of plant produced mixtures that include

    gradation and asphalt content, voids filled with asphalt, air voids, moisture susceptibility tests (Modified

    Lottman), and roadway parameters such as pavement density [1]. These controlling properties have served

    Louisiana well, yet with growing interest in considering alternative paving materials such as rubber modified

    asphalts, reclaimed asphalt pavement (RAP), recycled shingles, and warm-mix asphalt (WMA) technologies,

    there is a pressing need to implement laboratory mechanical testing capable of ascertaining an asphalt mixture’s

    ability to resist common distresses. This research presents an evaluation of LWT and SCB tests for rutting and

    cracking evaluation of commonly produced mixtures from around the state. This research also presents the

    results of a balanced mixture design methodology being developed by DOTD. A total of 51 mixtures were

    evaluated with both the SCB and LWT tests. With respect to LWT Testing, 46 of the 51 mixtures evaluated

    (90%) passed the criteria specified for acceptable rutting resistance. The criteria (10 mm at 20,000 passes for

    unmodified binder; 6 mm at 20,000 passes for polymer-modified binder) currently being utilized by DOTD

    appears to be appropriate for mixtures being produced. With respect to Semi-Circular Bend Testing, the percent

    of mixtures passing this criterion for mixtures containing PG 64-22, PG 70-22M, PG 76-22M and PG 82-

    22CRM is 38, 68, 91, and 20 respectively. For the mixtures designed according to the DOTD proposed balanced

    mixture design specifications, 7 out of 11 met or exceeded the cracking criteria and rutting criteria. The

    comparison of field and laboratory compacted specimens shows there may be an effect of specimen type on the

    computed Jc. This relationship would need to be further investigated before using field cores for quality

    assurance practices.

  • Format:
    PDF
  • Alternate URL:
  • Funding:
  • 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