Practical Approach for Designing Pavement Constructed with Recycled Roadway Materials
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Resilient modulus and plastic deformation of two recycled base course materials, recycled pavement material (RPM) and road surface gravel (RSG) and natural aggregate (Class 5), were investigated using a large-scale model experiment (LSME) and laboratory bench-scale resilient modulus (BSRM) tests.

The RPM and RSG were tested alone and with 10% by weight ClassC fly ash. The LSME tests indicate that the summary resilient modulus (SRM) of the unbound base course materials increases with increasing thickness of the base course and RPM and RSGexhibit significantly higher rate of plastic deformation (i.e. three to four times) than Class 5aggregate. Stabilization of the recycled materials by fly ash reduces the required thickness of the base course up to 30% when designed in accordance with the AASHTO 1993 design guide.The SRM and plastic deformation from LSME tests were used in the Mechanistic-EmpiricalPavement Design Guide (MEPDG) to predict the lifetime expectancy of a pavement with a base course consisting of recycled materials alone and with fly ash stabilization. Stabilization of recycled materials used as base course can reduce the required thickness of the base course up to 30% or increase the service life of pavements by more than 20%.

Publication Summary

  • Geosyntec Authors: Ali Ebrahimi
  • All Authors: Ebrahimi, A., Kootstra, B., Benson, C. H., and Edil, T. B.
  • Title: Practical Approach for Designing Pavement Constructed with Recycled Roadway Materials
  • Event or Publication: Int. J. of Road Materials and Pavement Design, Taylor and Francis
  • Practice Areas: Geotechnical and Geoenvironmental Engineering
  • Citation: Int. J. of Road Materials and Pavement Design, Taylor and Francis, iFirst, pp. 1-18
  • Date: 2011
  • Type: Publication (Online)