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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
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/30894/dot_30894_DS1.pdf
  • File Type:
    Filetype[PDF - 190.76 KB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha256:487e7303eca7f0a5e752d4d87a67dc3756d0e8a1534b5610b5b5cabe3a2194ef
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