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Evaluation of Pavement Service Life Extension Due to Asphalt Surface Treatment Interlayer Over Soil-Cement Base

File Language:
English


Details

  • Creators:
  • Corporate Creators:
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  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/LA.17/632
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Louisiana;United States
  • Edition:
    Final Report 07/2016-06/2019
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    The Louisiana Department of Transportation and Development (DOTD) has been using asphalt surface treatment (AST) interlayers over soil-cement base courses for the last several years to control the reflective cracking of flexible pavements caused by soil-cement shrinkage. Even though DOTD has the specifications documents, the practice of AST interlayer use and application differs from district to district. Furthermore, there have been no studies conducted to determine the cost-effectiveness of AST interlayers over soil-cement bases. The service life extension or gain in service life of flexible pavements due to such practice is also unknown. In this regard, the Louisiana Transportation Research Center (LTRC) initiated a research study that addresses the aforementioned issue. The main goal of the study was to evaluate the actual field performance of flexible pavements with and without AST interlayer over soil-cement bases using the PMS database. A comprehensive review of the state-of-the-practice of DOTD districts and other state highway agency about AST interlayers practices over soil-cement was conducted. A survey of DOTD district was launched to understand the state-of-the-practice and the construction procedures regarding such practices. Extensive data mining was commenced to identify pavement projects with and without AST interlayers with sufficient historical records and pavement performance data. Comprehensive evaluation of performances of the selected projects was performed based on the analysis of the time series distress data (roughness, cracking, and rutting) obtained from the pavement management system (PMS) database. Performance prediction models for each distress type with and without AST interlayer on soil-cement bases were also developed. Based on the pavement service life and area benefit concept, the cost of the treatment, the benefit/cost (B/C) was determined to assess the cost-effectiveness of AST interlay over soil cement bases. Finally, it was concluded that AST Interlayer is not a cost-effective option to mitigate reflective cracking over soil-cement bases in the state of Louisiana. On the contrary, cement treated design (CTD) bases without AST interlayer appeared to be the best cost-effective option for reflective crack mitigation.
  • Format:
    PDF
  • Funding:
    LTRC Project Number: 16-5P SIO Number: DOTLT1000089
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:5dce633a6017ef732bd982bc72c864f91f00f14704d4756672ebe09bce6c3b7d7bd9819f50528fc43619798e270121bed9f5110f5750d3a2a265e4c6d9dfc85e
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  • File Type:
    Filetype[PDF - 4.96 MB ]
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