United States Department of Transportation
i
Assessing techniques and performance of thin OGFC/PEM overlay on micro-milled surface : final report.
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2014-08-01
[PDF-3.09 MB]
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Edition:Final report
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Abstract:The practice of placing an open-graded friction course (OGFC) or a porous European mix (PEM)
directly on top of a conventional milled surface has rarely been done in Georgia due to concerns that this
rehabilitation method could potentially cause delamination of the surface layer due to poor bonding
between the OGFC/PEM layer and the conventional milled surface. This report presents the research
study for evaluating the quality of two micro-milling operations (one on I-75 and one on I-95) designed
to reduce the potential for these issues.
Results obtained from the I-75 project indicated that based on four years of satisfactory performance
of the PEM overlay the use of a 95-percentile ridge-to-valley texture depth (RVD) parameter as the
threshold value for compliance with the correction 3.2 mm RVD acceptance requirement could be too
restrictive. Alternatively, Mean RVD was tentatively adopted on the I-95 project for compliance with the
correction 3.2 mm RVD acceptance criteria. The research team concluded that the ultimate decision for
selecting an appropriate RVD parameter for compliance with the correction 3.2 mm RVD acceptance
requirement should be based on the long-term performance of the OGFC/PEM layer placed on the
micro-milled surface.
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