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Federal Highway Administration > Publications > Focus > December 2013 > In-Place Recycling Techniques for Asphalt Pavements

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Publication Number: FHWA-HRT-14-009
Date: December 2013

Cover of FHWA's Pavement Management Roadmap.

In-Place Recycling Techniques for Asphalt Pavements

Looking for the latest on in-place recycling? The Federal Highway Administration’s (FHWA) National Highway Institute (NHI) offers a newly updated “Asphalt Pavement In-Place Recycling Techniques” course (Course No. FHWA-NHI-131050) to help highway agencies implement sustainable and cost-effective alternatives to traditional rehabilitation practices. When using in-place recycling, the existing pavement materials are reused for the new pavement.

Developed in partnership with the Asphalt Recycling and Reclaiming Association, the course combines 2 online training modules with 2 days of instructor-led classroom sessions. Participants will learn how to select the appropriate in-place recycling technique for a given set of conditions, including different traffic levels, pavement conditions, and environments; choose the appropriate materials for the project and develop the mix design; develop suitable specifications, including method specifications and performance specifications; and effectively construct the pavement. Techniques covered are hot-in-place recycling, cold-in-place recycling, and full-depth reclamation.

“This training is a step forward in helping participants better understand the benefits of in-place recycling technologies for asphalt pavements,” said Lee Gallivan of FHWA.

The two online modules introduce pavement evaluation techniques and the three potential recycling techniques, along with the types of equipment commonly used for each. Participants then attend the 2-day classroom session, which focuses on project and technique selection, materials and mix design, construction specifications, and how to address issues that may affect the constructability of a project.

The course is designed for State and local transportation agency engineers and other personnel responsible for asphalt pavement maintenance, resurfacing, rehabilitation, and reconstruction projects. Contractors, consulting engineers, and industry personnel involved in asphalt pavement in-place recycling will also benefit from the training.

For information on scheduling the course, visit www.nhi.fhwa.dot.gov and select “Search for a Course.” The course fee is $400 per person, with a minimum class size of 20 and a maximum of 30. For additional information on the course content, contact Lee Gallivan at FHWA, 317-226-7493 (email: victor.gallivan@dot.gov).

Checklists for In-Place Recycling

Two new publications from FHWA provide guidance on using in-place recycling techniques. Hot In-Place Asphalt Recycling Application Checklist (Pub. No. FHWA-HIF-13-061) examines the three main processes that make up hot in-place asphalt recycling: surface recycling, remixing, and repaving. These three processes are combined with the placement of an overlay of new hot-mix asphalt to reconstruct a pavement.
Full Depth Reclamation Construction Checklist (Pub. No. FHWA-HIF-13-036) offers a handy field guide to using full-depth reclamation (FDR) as an alternative to traditional pavement reconstruction. FDR consists of pulverizing and mixing in place distressed asphalt materials and the underlying pavement materials. Stabilizing agents such as cement, lime, or asphalt may also be added. The resulting material is used as a base for the new pavement.
Topics covered in both checklists include preliminary project tasks such as document review and materials checks, preconstruction inspection responsibilities, weather requirements, mix design, traffic control, and responsibilities for project inspection. Also included are common problems and solutions.
To download the Hot In-Place Asphalt Recycling Application Checklist, visit www.fhwa.dot.gov/pavement/pub_details.cfm?id=356 or www.pavementpreservation.org/fhwa-resources/fhwa-preservation-brochures/. Full Depth Reclamation Construction Checklist is available at www.fhwa.dot.gov/pavement/pub_details.cfm?id=896. For more information on the checklists, contact Lee Gallivan at FHWA, 317-226-7493 (email: victor.gallivan@dot.gov).

Cover graphic of FHWA’s Hot In-Place Asphalt Recycling Application Checklist. Cover graphic of FHWA’s Full Depth Reclamation Construction Checklist.

A side view of a paver laying hot-mix asphalt. One worker is operating it.
Workers operate a paver. Six workers wearing safety vests are visible.
Highway engineers observe a demonstration of in-place recycling equipment on a roadway.
FHWA’s “Asphalt Pavement In-Place Recycling Techniques” course guides highway agencies in recycling existing pavement materials for use in a new pavement.

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Updated: 02/11/2014

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