In Place of Failure: After Years of Just Doing It, Iowa Finds Positive Long-Term Performance of CIR Layer

Cold in-place recycling (CIR) has been used widely in Iowa, but without any formal evaluation of its performance until 2003, when the Iowa Highway Research Board initiated a study to examine its long-term performance. Two different measures were used: changes in field distress and variations in CIR material characteristics. This study attempts to quantify the influence of CIR on pavement performance. Techniques for measuring pavement characteristics are described, including pavement image analysis to compute the pavement condition index (PCI). Index values were plotted against pavement age for each group of pavements, which is a function of subgrade modulus and average annual daily traffic. Overall findings of pavement performance under different conditions are presented, along with CIR performance as a material.

  • Availability:
  • Authors:
    • Heitzman, Michael
    • Lee, Hosin David
    • Kim, Jungyoung
    • Chen, Don
    • Jahren, Charles T
  • Publication Date: 2007-5


  • English

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Filing Info

  • Accession Number: 01052183
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Jun 11 2007 2:45PM