United States Department of Transportation
i
Environmental and functional benefits and trade-offs of hot in-place recycling treatment techniques : final project report.
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2016-12-01
[PDF-9.40 MB]
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Abstract:Surface recycling is suitable for pavements with minor cracks limited to 25-50 mm in depth. Hot-in-place recycling (HIR) process includes drying and heating the upper layers, scarifying the soft asphalt, mixing the scarified material with a rejuvenator, if required, and finally placing and compacting the recycled material. Additional asphalt concrete (AC) overlay (OL) or other surface treatment may be required. In some cases, additional aggregate and binder may be added. The HIR performance and its environmental impacts were considered in this study. Three test sites, located in Galesburg and Machesney Park, Illinois, and Dyer, Indiana, were HIR treated and evaluated in-situ and in the lab. Physical and rheological properties of binder recovered from each site were obtained. Interaction plots, combining rut depth from the wheel track test (WTT) and flexibility index (FI) from the Illinois Flexibility Index Test (I-FIT), were in agreement with binder test results. Falling weight deflectometer and roughness measurements were conducted before and after HIR. The environmental assessment showed a difference in energy usage and GHGs of 3.9–17.6% and 1.3–19.2%, respectively, between a HIR process with 38 mm AC overlay and a corresponding traditional 50 mm mill and AC OL for different plant locations. Energy savings from using HIR treatments heavily depend on the surface treatment after HIR, thickness of overlay (if overlay is chosen as the surface treatment), and hauling distances for plant-produced materials needed for overlays. This study will help selecting proper treatment guidelines based on type and condition of pavement, timing of rehabilitation, and construction temperature for the decision-making considering performance, cost, energy, and GHG emission.
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