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: 1/1/1900 - 1/1/1900
Status: Active
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: