United States Department of Transportation
i
Statewide implementation of very thin overlays.
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2014-10-01
[PDF-2.46 MB]
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Abstract:Very thin overlays are defined as overlays where the final lift thickness is 1 inch or less. These are designed
to be high performance overlays in that they have to pass both a rutting (Hamburg Wheel tracking Test) and
reflection cracking (Overlay Test) requirements. In this study three different types of thin overlay were
designed and placed in the field; these being the open graded (fine Permeable Friction Course), gap graded
(fine Stone matrix Asphalt) and fine dense graded mix. To meet the performance requirements, only high
quality aggregates are recommended for these mixes, and for most applications the use of a PG 76-22 binder
is recommended. Consequently these mixes cost approximately 30% more per ton than traditional Item 341
dense graded mixes. However, because of the thin placement temperatures a substantial savings per square
yard has been reported when using these mixes.
In this study, test sections were built in several districts around the state, and the performance to date has
been excellent. Specifications were written, and many of the recommendations have been incorporated into
the Construction Division’s current statewide specifications.
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