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    AASHTO T307 — Background and Discussion

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    The current AASHTO protocol for determination of resilient modulus of soils and aggregate material (T307-99) is based largely on Long Term Pavement Performance (LTPP) Protocol P46. The LTPP protocol evolved over a number of years and has had numerous contributors (including significant guidance and input from the authors of this paper). To-date, over 3000 samples have been tested with P46 and results of this testing effort will have far-reaching implications in the development of performance models for pavement structures. Many lessons were learned during development of P46 and this history is documented in a companion paper. The present paper provides a background of the reasons and rationale behind some of the major technical aspects of P46, and by direct association, AASHTO T307. The paper also offers suggestions for improvement or modification of T307. It is hoped that this discussion will lead to a deeper understanding of the test procedure and perhaps facilitate a discussion of the direction the T307 procedure should follow in the future.


    resilient modulus, laboratory testing, unbound materials, subgrade, guidelines, LTPP, T307, LTPP Protocol P46

    Author Information:

    Groeger, JL
    Vice President, Axiom Decision Systems, Inc., Columbia, MD

    Rada, GR
    Assistant Vice President, LAW PCS, Beltsville, MD

    Lopez, A
    LTPP Team Leader, Federal Highway Administration, McLean, VA

    Committee/Subcommittee: D18.09

    DOI: 10.1520/STP12519S