Thin Open-Graded Friction Overlays for Pavement Preservation
Thin asphalt overlays are one of the most popular preservation treatments for asphalt and composite pavements. Although commonly used, thin overlays are not constrained to dense-graded mixtures. Gap-graded and open-graded mixtures have also been used by several agencies with good results. There are multiple sources that provide information on the performance of thin asphalt overlays and open-graded friction course (OGFC) mixtures. However, few studies have focused specifically on evaluating thin OGFC overlays as pavement preservation treatments. The objective of this study was to evaluate the field performance of thin OGFC overlays used for pavement preservation. To accomplish this objective, five test sections with different tack coats were built on a high traffic volume road in Alabama, and their performance was monitored through time. Performance data included cracking, rutting, roughness, macrotexture, noise and pavement deflections. In addition, the sections were cored annually and tested for permeability and bond strength. The results obtained after nearly five years of service show that overall, the sections have exhibited good durability performance and structural health, which are capable of extending the life of the pavement. The functionality of the OGFC layer has decreased over time, suggesting that some of the added benefits of open-graded mixtures, such as permeability and noise reduction, may be lost within the first few years of service. The bond strength measured at the interface between the OGFC layer and the underlying asphalt concrete was above the recommended minimum of 100 psi for all sections and has not changed significantly over time.
- Record URL:
-
Supplemental Notes:
- This paper was sponsored by TRB committee AKT20 Standing Committee on Pavement Preservation.
-
Corporate Authors:
Transportation Research Board
, -
Authors:
- Vargas-Nordcbeck, Adriana
- Leiva-Villacorta, Fabricio
-
Conference:
- Transportation Research Board 100th Annual Meeting
- Location: Washington DC, United States
- Date: 2021-1-5 to 2021-1-29
- Date: 2021
Language
- English
Media Info
- Media Type: Web
- Features: Figures; References; Tables;
- Pagination: 15p
Subject/Index Terms
- TRT Terms: Asphalt pavements; Composite pavements; Overlays (Pavements); Preservation
- Geographic Terms: Alabama
- Subject Areas: Highways; Maintenance and Preservation; Pavements;
Filing Info
- Accession Number: 01763583
- Record Type: Publication
- Report/Paper Numbers: TRBAM-21-01554
- Files: TRIS, TRB, ATRI
- Created Date: Feb 4 2021 10:54AM