United States Department of Transportation
i
Evaluation of HMA overlays in Illinois.
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2008-09-01
[PDF-475.93 KB]
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Abstract:The Illinois Department of Transportation (IDOT) has evaluated the performance of the pavements in Illinois in a
variety of studies over the years. Since those studies were conducted, several changes in IDOT practices, policies, and
procedures have sparked the need to reassess the performance of HMA overlays in Illinois.
The purpose of this study was to examine the performance of HMA overlays in Illinois. The service life of the
overlays is affected by a variety of factors that were examined in this study. Specifically, the following attributes were
examined:
• Construction year period
• Location
• Condition before overlay placement
• Presence of D-cracking on rigid pavement sections before overlay
• Underlying concrete type
• Estimated overlay number
• Overlay type
The service life trends observed in the 231 examined datasets were as expected for the majority of the datasets.
However, there were some inconsistencies or unexpected trends in the results for several data sets. For those cases, the
data were reviewed and the reasons for the inconsistent or unexpected trends were often obvious. The data causing the
unexpected trends were not removed from the datasets as the data was true CRS data. Based upon the service life
results, the impact of the evaluated variables on the performance of the HMA overlays were documented in the report. The
database of information developed as part of the study contains a wealth of information that can be used to further analyze
the effects of various attributes on the performance of HMA overlays.
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