Rehabilitation Techniques for Stripped Asphalt Pavements

https://doi.org/10.21949/15182332002PDFTech ReportFHWA/MT-002-003/8123MSU G&C #290220MDT project #8123RecyclingStripping (Pavements)Asphalt pavementsAsphalt concreteLife cycle analysisMix designOverlays (Pavements)Pavement distressPavement maintenanceRehabilitation (Maintenance)Surface course (Pavements)MontanaMontana. Department of TransportationJohnson, David R.Freeman, Reed B.Western Transportation InstituteMontana. Dept. of TransportationUnited States. Federal Highway AdministrationUS Transportation CollectionAsphalt stripping is a fairly common form of distress for pavements in Montana, particularly for pavements that were surfaced with an open-graded friction course. Currently, the technique for rehabilitating these pavements involves the costly removal of most or all of the stripped material, prior to the placement of an overlay. The goal of this research was to determine whether the stripped material can remain in-place, serving as a structural layer within the rehabilitated pavement. This study has involved the construction of five test sites, which were incorporated into larger overlay projects. At each of these sites, stripped material was removed from a control section and stripped material was left in-place for a test section, prior to the placement of the overlay. Leaving stripped asphalt concrete surface material in-place during rehabilitation, to be overlayed with the new asphalt concrete, did not tend to make the rehabilitated pavement more susceptible to either stripping damage or load-induced damage. Life-cycle cost analyses should consider rate of stripping deterioration (in./year) to new asphalt concrete to be the same, whether or not stripped material is removed prior to placing an overlay. Overlay thickness and mix design methods for resisting stripping are the important factors for extending the life of a rehabilitated stripped asphalt pavement.90