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Durability assessment of coarse aggregates for HMA in Maine.

File Language:
English


Details

  • Creators:
    Nener-Plante, Derek
  • Corporate Creators:
    Maine. Dept. of Transportation
  • Subject/TRT Terms:
  • Publication/ Report Number:
    43075
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Maine
  • Corporate Publisher:
    Maine. Dept. of Transportation
  • Abstract:
    In this study, Micro-Deval and L.A. Abrasion were used to evaluate the durability of 72 individual ; coarse aggregates used for HMA in Maine. Aggregates used in hot-mix asphalt (HMA) must be ; durable and resistant to abrasion and degradation. Material loss in HMA pavements has recently ; been observed by MDOT and aggregate degradation has been hypothesized as a possible contributor. ; The Micro-Deval results showed no correlation with results from the L.A. Abrasion and the range in ; values was quite large. Two alternative methods of analyzing Micro-Deval were employed to ; measure the change in gradation of aggregate samples. A relatively large portion of tested aggregate ; sources were found to degrade significantly in the Micro-Deval test while having acceptable ; AASHTO Micro-Deval loss values, this presumably due to fracturing instead of abrasion. The ; weighted average method and area between curves method proved to be effective in measuring the ; change in particle size distribution not captured with the Method 1 Micro-Deval loss value. In ; addition, a significant influence of initial grading size was found in all of the Micro-Deval data with ; finer initial gradations producing higher loss values. The alternative analysis methods for Micro-Deval are recommended for use in detecting degradation not captured by the traditional Micro-Deval ; value
  • Format:
    PDF
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/27823/dot_27823_DS1.pdf
  • File Type:
    Filetype[PDF - 697.88 KB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha256:86ebf73929efc8ef20128f5dc415940ac4573d3ddfae95e4c7a89eb227bc5180
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