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Testing and analysis of LWT and SCB properties of asphaltic concrete mixtures : tech summary.

File Language:
English


Details

  • Creators:
    Cooper, Samuel B.
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Subject/TRT Terms:
  • Publication/ Report Number:
    LTRC Report 536
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Louisiana
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    For pavement to perform well in the fi eld, a balance of both rut and crack resistance in response to the traffi c loads

    and environment conditions is required. Controlling volumetric properties of a hot mix asphalt (HMA) mixture is not

    enough to ensure good pavement performance because pavements often do not perform as they are designed. DOTD

    specifi cations were designed to target rutting as the major distress impacting Louisiana roadways. However, an adverse

    eff ect of that specifi cation was the production of “dry” mixtures. The reduced asphalt content in the mixtures resulted in

    questionable durability of the roadway. A possible solution would be the development of laboratory test procedures to

    evaluate the as-built pavement-qualities to predict the pavement performance and life. In so doing, numerous agencies

    around the United States are incorporating mechanical tests to evaluate the rutting potential, cracking potential, and

    moisture susceptibility of HMA mixtures. Recent DOTD specifi cation changes were implemented and evaluated using

    semi-circular bending (SCB) and loaded wheel tracking (LWT) tests. The results of these

    specifi cations were used to implement balanced mixture design practices. This study

    evaluated the use of the LWT and SCB tests as end result parameters to indicate the

    stability and durability of HMA mixtures. As part of this study, an attempt was made

    to develop a simplifi ed and reasonable SCB test procedure so that the commonly used

    Marshall Load frame device would be adapted for plant and district laboratory testing.

  • Format:
    PDF
  • Funding:
    SIO No. 30000220 / LTRC Project No. 11-3B
  • Collection(s):
  • Main Document Checksum:
    urn:sha256:487e7303eca7f0a5e752d4d87a67dc3756d0e8a1534b5610b5b5cabe3a2194ef
  • Download URL:
  • File Type:
    Filetype[PDF - 190.76 KB ]
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