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Mid-America Transportation Center

Use of High-Volume Reclaimed Asphalt Pavement (RAP)for Asphalt Pavement Rehabilitation Due to Increased Highway Truck Traffic from Freight Transportation


Researchers

  • Principal Investigator: Hosin Lee (hlee@engineering.uiowa.edu 319-335-6818)
  • Project Status
    In Progress
    Sponsors & Partners
  • Kansas State University
  • Nebraska Department of Roads
  • About this Project
    Brief Project Description & Background
    Most state agencies and paving contractors advocate use of high volumes of reclaimed/recycled asphalt pavement (RAP) in hot-mix asphalt (HMA). However, this can result in non-homogeneity of Superpave mixtures that may not perform well. This project will study the use of fractionated RAP (FRAP) and/or combination of RAP and FRAP at different percentages for asphalt pavement rehabilitation. Impacts of various percentages of FRAP on the binder grading, and whether combinations of high percentages of RAP and FRAP in Superpave mixture designs can meet current mix design requirements, potential impact on the mechanistic and rutting characteristics of the mixture will also be studied in detail. Use of RAP/FRAP for shoulder mixtures will also be investigated.
    Research Objective
    The objective of this research are to evaluate current practices of RAP and FRAP in HMA by different agencies around the country; characterize and evaluate typical FRAP from existing Superpave pavement sources in Kansas; and investigate RAP/FRAP percentage feasibility using appropriate laboratory tests.
    Potential Benefits
    This research will help KDOT and other agencies use Superpave mixtures with RAP/FRAP in a way that is cost-effective while still maintaining the integrity of the pavement.
    Abstract
    The recent spike in asphalt binder prices has forced state highway agencies and paving contractors to consider use of high volumes of Reclaimed/Recycled Asphalt Pavement (RAP) in hot-mix asphalt (HMA). However, use of RAP this can result in non-homogeneity of Superpave mixtures that may not perform well. The Kansas Department of Transportation performed rut testing on samples with high volumes of RAP and FRAP in Superpave mixtures with high variability of performance. Thus, more systematic evaluation of both RAP and fractionated RAP is warranted. This project will study the use of fractionated RAP (FRAP) and/or combination of RAP and FRAP at different percentages for asphalt pavement rehabilitation. Impacts of various percentages of FRAP on the binder grading, and whether combinations of high percentages of RAP and FRAP in Superpave mixture designs can meet current mix design requirements, potential impact on the mechanistic and rutting characteristics of the mixture will also be studied in detail. Use of RAP/FRAP for shoulder mixtures will also be investigated.
    Project Amount
    $ 20,002