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Resilient Modulus


In its publication LTPP Materials Characterization: Resilient Modulus of Unbound Materials (LTPP Protocol P46) Laboratory Startup and Quality Control Procedures (FHWA-RD-96-176), LTPP laid out a standardized laboratory procedure to measure the resilient modulus of subgrade materials, along with a related laboratory startup and calibration verification procedure. This procedure was subsequently adopted as an American Association of State Highway and Transportation Officials (AASHTO) provision standard, "Standard Test Method for Determining the Resilient Modulus of Soils and Aggregate Materials."

To help highway agencies understand the procedure, a series of three videotapes were produced by FHWA through a cooperative agreement with the Minnesota Department of Transportation. The videotapes address key questions about the new procedure for highway administrators, engineers, laboratory managers, and technicians. They are:

Laboratory Resilient Modulus Testing: Is This the Right Time? Intended for administrators and engineers, this 8-minute videotape explains resilient modulus and what it is used for. It also explains the developments that have made resilient modulus testing more consistent and easier to adopt.

Laboratory Resilient Modulus Testing: Startup and Quality Control Procedure. This 15-minute videotape for laboratory managers and technicians begins with a detailed definition of resilient modulus. It then explains the procedure developed under the LTPP program to ensure that a laboratory is set up properly to conduct the resilient modulus test procedure and to collect accurate test results. The procedure ensures that test results are comparable regardless of where or when they were obtained.

Laboratory Resilient Modulus Testing: Sample Preparation and Test Procedure. This 13-minute videotape for managers and technicians describes each of the steps in the resilient modulus test procedure, including how to prepare soil and aggregate samples.

Additional information on the Resilient Modulus videotapes includes:

  • Resilient Modulus Videotapes Product Brief - Provides a short description of the product, along with its key features and system requirements.

  • PowerPoint Presentation (Part 1 (1.2 mb), Part 2 (1.9 mb)) - Provides a basic presentation on the procedure, why and how it was developed, and examples of where the procedure has been used.

  • Order Videotapes - For more information or to order the videotapes, contact:

    Mike Moravec
    telephone: 202-366-3982
    e-mail: Mike.Moravec@dot.gov

PDF files can be viewed with the Acrobat® Reader®



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