STP561

    Dynamic Testing of Bituminous Mixtures for Permanent Deformation Response

    Published: Jan 1974


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    Abstract

    Permanent deformation, fatigue, and shrinkage fracture are the three major distress mechanisms found in flexible pavements. To date, however, little quantitative information is available on the fundamental material characteristics related to load-associated permanent deformation. The response and characterization of paving materials have proven to be complex problems. This situation has retarded the development of a reliable deformation predictive technique and, consequently, a systematic pavement design process.

    This paper briefly discusses available permanent deformation predictive approaches. It is indicated that current techniques are inadequate in their present form. A new approach based upon laboratory tests under simulated field conditions is advanced, and the essential operating characteristics of associated materials characterization test equipment are outlined. The apparatus, which includes a temperature-controlled triaxial test chamber, electrohydraulic systems for independent control of axial and lateral dynamic stresses, and ancilliary measuring instruments is described.

    The equipment can be used to evaluate a wide variety of conditions and paving materials. The test results have been used as input data to the development of statistically based models for predicting the permanent deformation of full-depth sections at the Brampton Test Road, Ontario. Excellent agreement between measured and predicted values have been obtained.

    Keywords:

    fatigue tests, flexible pavements, design, deformation, bitumens, material characterization, dynamic tests, electrohydraulic equipment, triaxial tests


    Author Information:

    Morris, J
    Research assistant and professor associate chairmanairport engineer, University of Waterloo, WaterlooOttawa, Ont.Ont.

    Haas, RCG
    Research assistant and professor associate chairmanairport engineer, University of Waterloo, WaterlooOttawa, Ont.Ont.


    Paper ID: STP32179S

    Committee/Subcommittee: D04.20

    DOI: 10.1520/STP32179S


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