Harmonized Test Methods for Laboratory Determination of Resilient Modulus for Flexible Pavement Design

The modulus of pavement layer materials is a necessary input to mechanistic-type design and analysis procedures for flexible pavements. Resilient moduli (MR) were initially introduced in the first U.S. mechanistic design procedure developed in 1972 by the Asphalt Institute. The MR response of both hot-mix asphalt (HMA) and unbound materials was universally introduced in the 1986 edition of the American Association of State Highway and Transportation Officials (AASHTO) Guide for Design of Pavement Structures. National Cooperative Highway Research Program (NCHRP) Project 1-28 was completed in 1997. Its primary objective was to develop and recommend laboratory test procedures for determining resilient moduli of component materials in a flexible pavement structure that could account for varying field conditions, particularly temperature and moisture content. Project 1-28 produced recommended MR methods for HMA and unbound materials that represent enhancements of previously developed methods presented by AASHTO, American Society for Testing and Materials (ASTM), and the Strategic Highway Research Program (SHRP)Long-Term Pavement Performance (LTPP) program. These recommended enhancements yield a substantial increase in precision, accuracy, and practicality over the existing standard methods. The objective of this research project was to develop two implementable products from the results of the Project 1-28 research: (1) a single test method for measurement of the resilient modulus of HMA that harmonize the protocol proposed by Project 1-28 with the existing AASHTO TP31 method and the Federal Highway Administration (FHWA) LTPP Laboratory Start-Up and Quality Control Procedure; and (2) a single test method for measurement of the resilient modulus of unbound granular base/ subbase materials and subgrade soils that harmonize the protocol proposed by Project 294 methods and the FHWA LTPP Laboratory Start- Up and Quality Control Procedure.

Language

  • English

Project

  • Status: Completed
  • Funding: $101325
  • Contract Numbers:

    Project 1-28A

  • 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:

    University of Maryland, College Park

    Department of Civil and Environmental Engineering
    1173 Glenn Martin Hall
    College Park, MD  United States  20742
  • Principal Investigators:

    Witczak, Matthew

  • Start Date: 19980201
  • Expected Completion Date: 0
  • Actual Completion Date: 20030522
  • Source Data: RiP Project 41434

Subject/Index Terms

Filing Info

  • Accession Number: 01459667
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 1-28A
  • Files: RiP, USDOT
  • Created Date: Jan 3 2013 1:08PM