Beta Testing and Validation of HMA PRS

The National Cooperative Highway Research Program (NCHRP) Project 9-22 began in 2000 with the goal of advancing the hot mix asphalt (HMA) performance-relatedspecification (PRS0 software (HMA Spec) developed in the WesTrack project to implementation. However, the capabilities of the WesTrack PRS software proved too limited for general use across the United States. The project then evaluated the possibility of directly adapting the Mechanistic-Empirical Pavement Design Guide (MEPDG) software to use as an HMA PRS but this approach proved too complex and was superseded by work to base the HMA PRS on the spreadsheet solutions of the MEPDG originally developed in NCHRP Project 9-19 as specification criteria for the simple performance tests for permanent deformation and fatigue cracking. This final version of the HMA PRS was named the Quality-Related Specification Software (QRSS). The QRSS is a stand-alone program that calculates the predicted performance of an HMA pavement from the volumetric and materials properties of the as-designed HMA and compares it with that of the as-built pavement calculated from the contractor's lot or sub-lot quality control data. The calculated differences for the permanent deformation, fatigue cracking, low-temperature cracking, and IRI determine pay factors for each lot or sub-lot. The performance predictions are project-specific; the QRSS accounts for the climate, traffic, pavement structure, and desired or expected service life. Further, the predictions are probabilistic; they are calculated through a Monte Carlo procedure that uses historical standard deviations of the input properties in order to account for construction and testing variabilities when assigning risk between the owner agency and the contractor. The objective of this project was to develop, test, and evaluate the QRSS.


  • English


  • Status: Completed
  • Funding: $1500000.00
  • Contract Numbers:

    Project 9-22

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Harrigan, Edward

  • Performing Organizations:

    Fugro Consultants, Incorporated

    Austin, TX  United States 
  • Principal Investigators:

    Moulthrop, James

    Witczak, Matthew

  • Start Date: 20001003
  • Expected Completion Date: 0
  • Actual Completion Date: 20101130
  • Source Data: RiP Project 5225

Subject/Index Terms

Filing Info

  • Accession Number: 01464911
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 9-22
  • Files: RiP, USDOT
  • Created Date: Jan 3 2013 2:51PM