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    A Canadian Investigation of Load Testing Applied to Pavement Design

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    Repetitive plate bearing tests have been made on the subgrades, base courses, and flexible surfaces of the runways at ten Canadian airports.

    Useful correlations are given, by means of which limited load test data may be extrapolated to other bearing plate sizes between 12 and 42 in. in diameter and probably beyond, and to any deflection over the range of at least 0.0 to 0.7 in.

    Subgrade load test data have been correlated with cone bearing, Housel penetrometer, field California Bearing Ratio, and triaxial compression tests.

    The probable influence of repetitive loading and bearing plate size on the value of the subgrade modulus k for rigid pavement design is indicated.

    A method of design for the thickness of flexible pavements is developed, which has been correlated with runway service performance under airplane traffic in Canada.

    Charts of design curves for required thickness of flexible pavements have been prepared for a wide range of airplane wheel loadings for runways and for taxiways, and for the normal range of highway wheel loadings.

    Author Information:

    McLeod, Norman W.
    Engineering Consultant, Department of Transport, Ottawa, Ont.

    Committee/Subcommittee: D18.10

    DOI: 10.1520/STP43948S