Pilot Implementation of a New System to Calculate IRI Used for Pavement Design Procedures - Technical Report

The pilot implementation of the new system to calculate International Roughness Index (IRI) used for pavement design purposes and applied to the design of pavements on expansive clay subgrades was conducted successfully. Six training sessions were conducted in three Districts: three for design engineers and three for laboratory technicians. Three sets of testing equipment were received, set up, calibrated, and made operational in the three district labs. Two computer programs, one for design and the other for the analysis of a pavement cross-section, to determine the expected performance of expansive clay roughness countermeasures were delivered to the three districts. User guides for each of the programs were provided to each of those in attendance. It is recommended that statewide implementation should now proceed to make this capability available to other districts within the state that have pavement performance problems caused by expansive clay roughness. The statewide implementation effort should include the monitoring validation described above, technical support of the computer programs and laboratory testing, additional training sessions in at least six more districts, and involvement of consulting engineers in the training sessions.

  • Record URL:
  • Supplemental Notes:
    • Project Title: Pilot Implementation of a New System to Calculate IRI Used for Pavement Design Procedures. Report Date: October 2006; Resubmitted: January 2007; Published: April 2007.
  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 3135 TAMU
    College Station, TX  United States  77843-3135

    Texas Department of Transportation

    Research and Technology Implementation Office, P.O. Box 5080
    Austin, TX  United States  78763-5080

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Lytton, Robert L.
    • Aubeny, Charles P
    • Hong, Gyeong T
  • Publication Date: 2007-4


  • English

Media Info

  • Media Type: Print
  • Edition: Technical Report
  • Pagination: 18p

Subject/Index Terms

Filing Info

  • Accession Number: 01049422
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/TX-06/5-4518-01-1, Report 5-4518-01-1
  • Contract Numbers: Project 5-4518-01
  • Created Date: May 16 2007 10:56AM