Structural Assessment of Cold in Place Recycling Sections Used for Pavement Preservation
Cold recycling of asphalt pavements is a widely practiced technique used to prolong pavement life as a low-cost preservation method. Research in recycled materials has become necessary to further evaluate the material properties and performance of this sustainable technology. The National Center for Asphalt Technology (NCAT) has constructed several test sections as part of its Pavement Preservation Group (PG) Study along Highway US-280 near Opelika, Alabama. The preservation sections were built in the summer of 2015, and part of the experiment included two different sections using cold in-place recycling (CIR) with asphalt emulsion and foamed asphalt as recycling agents. A one-inch thin dense-graded asphalt overlay was placed as the wearing surface. Field data collection has been in progress since September 2015. The data collected included roughness, rutting, cracking, and deflections. Field performance measurements showed that the use of cold recycled materials influenced rut depths, falling into the fair threshold of the MAP-21 rating system during the first four and a half years of service. Cracking levels have been low, with under 1.5 percent of the total area. Roughness in the CIR-foamed section was steady over time, while the CIR emulsion section had a mild increasing trend. The backcalculated pavement modulus showed the cold recycled sections have temperature-dependent behavior, with more temperature susceptibility in the CIR-emulsion section. The obtained results were used to calculate the structural contribution of the recycling technologies from a pavement design perspective. The structural layer coefficients of the recycled materials ranged between 0.31 and 0.35.
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Supplemental Notes:
- This paper was sponsored by TRB committee AKT20 Standing Committee on Pavement Preservation.
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Corporate Authors:
Transportation Research Board
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Authors:
- Martinez-Rodriguez, Danny S
- Vargas-Nordcbeck, Adriana
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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: Digital/other
- Features: Figures; Photos; References; Tables;
- Pagination: 16p
Subject/Index Terms
- TRT Terms: Asphalt pavements; Cold in-place recycling; Layer coefficient (Pavements); Pavement maintenance; Pavement performance; Pavement structural numbers; Structural analysis; Sustainable development; Test sections
- Geographic Terms: Opelika (Alabama)
- Subject Areas: Environment; Highways; Maintenance and Preservation; Materials; Pavements;
Filing Info
- Accession Number: 01763616
- Record Type: Publication
- Report/Paper Numbers: TRBAM-21-00373
- Files: TRIS, TRB, ATRI
- Created Date: Feb 4 2021 10:57AM