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South Dakota Department of Transportation
Project Synopsis
SD2003-05


Title: Long Term Monitoring of Asphalt Concrete Anti-Strip Test Sections
Project Researcher: Peter Sebaaly, University of Nevada, Reno
Project Manager: Dan Johnston
Research Period: -
Status: Approved
Cost: $25,000.00

Problem Statement:SDDOT has used lime as an anti-strip additive for asphalt concrete (AC) for a number of years, as initial laboratory testing showed it to be a superior anti-strip agent. Recently, Dr. Peter Sebaaly, University of Nevada-Reno, completed SD1999-10 Asphalt Concrete Anti-strip Techniques which compared lime to several alternative anti-strip additives, both in laboratory and field testing. The results of this effort clearly showed lime was a superior ant-strip admixture based on laboratory testing of field samples such as cores and cutouts. Unfortunately, the series of test sections incorporating lime, a latex anti-strip admixture and two liquid anti-strip admixtures onto overlay construction projects near Yankton and Cottonwood did not demonstrate any significant performance differences as the evaluation period for the test sections coincided with a severe drought condition. The researchers final recommendation was:

The field surveys of the test sections indicated that the two-year period is not long enough to assess differences in field performance of the various anti-strip additives. The following extended performance monitoring program is recommended:

  • Conditions surveys of the test sections should be continued on an annual basis (annually using Research staff and biennially by the researcher).

  • Field cores should be obtained after 5 and 8 years of service or as seems necessary by the condition surveys.

  • Field cores should be evaluated through a laboratory program similar to the one used on the two years old cores.

  • This research project is intended to provide further monitoring and field verification of performance differences between the various test sections.



    Findings:

    Research Objectives:
    1  Provide a field performance evaluation of lime compared to other anti-strip admixtures.
    2  Compare initial laboratory test results with long-term field performance and additional laboratory testing of cores.
    3  Assess the appropriateness of current laboratory testing to predicting field performance.

    Research Tasks:
    1  Submit a work plan outlining the evaluation and anticipated laboratory testing efforts.
    2  Monitor and evaluate the performance of the test sections on a biennial basis through the conclusion of the research and note any significant differences.
    3  Sample appropriate locations in each of the 12 test sections and conduct laboratory testing including resilient modulus, binder testing and permanent deformation testing.
    4  Correlate field observations and laboratory test results with prior research on the same test sections and evaluate the predictive potential of the prior test results.
    5  Evaluate the field performance of the various anti-strip additives.
    6  Prepare a final report and executive summary of the literature review, research methodology, findings, conclusions, and recommendations.
    7  Make an executive presentation to the SDDOT Research Review Board at the conclusion of the project.

    Documents Available:
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