| Title | Proposed Performance-Prediction Equations and Threshold Triggers for Thin-Overlay Treatments Using The Long-Term Pavement Performance Database |
|---|---|
| Record ID | 65552 |
| Personal Name Creator |
Elwardany, Michael D.; Lee, Kangjin; Lee, Jung Hwa; Brown, Coleman; Castorena, Cassie; Kim, Y. Richard |
| Personal Name Contributor |
Walker, Deborah |
| Corporate Creator | North Carolina State University. Department of Civil, Construction, and Environmental Engineering |
| Corporate Contributor |
United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development; United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center |
| Publisher | United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development |
| Publication Date | 20180901 |
| Language | English |
| Abstract | The purpose of pavement-preservation treatments is to correct surface defects, improve ride quality, improve safety characteristics, and extend pavement life without increasing the structural capacity of the pavement. The application of a thin overlay is expected to extend the life of a pavement by 8–10 yr, although this range may vary depending on traffic, environmental conditions, quality of the materials, and workmanship. Thin overlays do not significantly increase the structural capacity of a pavement. Thus, the existing pavement condition should be evaluated carefully prior to the application of a thin overlay to ensure that structural rehabilitation is not necessary. A set of guidelines to determine the best time to apply thin-overlay treatments would help highway agencies optimize their budgets, thereby leading to potentially significant taxpayer savings. The objective of this study was to develop guidelines, parameters, and performance-prediction equations to select the most appropriate time to apply a thin-overlay treatment based on the condition of the existing pavement. To arrive at the proposed guidelines, data from the Long-Term Pavement Performance (LTPP) Program Specific Pavement Studies 3 and 5 were used to evaluate the effects of climate, traffic, existing asphalt concrete (AC)–layer thickness, and overlay thickness on the life extension that results from the application of thin-overlay treatments. The results demonstrate that threshold triggers based on longitudinal cracking in the wheel path and rutting severity can be used to select the best time to apply a thin overlay in order to achieve a target pavement-life extension. Analysis of the LTPP data shows that both the traffic level and existing AC-layer thickness significantly affect the life extension that results from the application of a thin overlay in terms of retarding rutting and longitudinal cracking, respectively. This paper presents empirical equations to predict the life gain that can be achieved from a thin-overlay treatment based on the existing pavement conditions. |
| Rosap ID | dot:37579 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/37579 |
| TRT Terms | Pavement performance; Pavement overlays; Longitudinal cracking; Rutting |
| General Subjects | Pavements--Performance--Data processing; Pavements--Performance--Databases |
| Geographical Coverage |
United States |
| OCLC | 1076361638 |
| Report Number | FHWA-HRT-17-111; HRDI-30/010-18(WEB)E |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/65000/65500/65552/FHWA-HRT-17-111.pdf |
| Format | |
| Database | NTL Digital Repository |