Investigation of Increase in Roughness Due to Environmental Factors in Flexible Pavements Using Profile Data From Long-Term Pavement Performance Specific Pavement Studies 1 Experiment

The International Roughness Index (IRI) is an index that is commonly used to characterize the roughness of a pavement. State transportation departments use the mean IRI (MIRI), which is the average of the left and the right wheelpath IRI, to monitor the roughness of their pavement network.The MIRI values computed from the profile data collected at the LTPP Specific Pavement Studies 1 (SPS-1) experiment, which was developed to investigate the effect of selected structural factors on the long-term performance of flexible pavements that were constructed on different subgrade types and different environmental regions, were used in this research. The objectives of this study included analyzing the center of the lane IRI (CLIRI) and MIRI at the test sections to evaluate changes over time, comparing the change in CLIRI and MIRI at the test sections, and investigating the effect of subgrade and environmental parameters on the increase in CLIRI.


  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: 12p
  • Serial:
    • TechBrief
    • Publisher: Federal Highway Administration
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 01674279
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-HRT-17-120
  • Files: TRIS, ATRI, USDOT
  • Created Date: Jun 28 2018 9:35AM