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    Tolerances and Variations of Highway Materials from Specification Limits

    Published: 01 January 1964

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    The application of statistical quality control techniques has proved to be a valuable management tool in the control of highway materials. The large masses of test data being collected daily by highway departments, when checked for reliability and properly analyzed statistically, can provide valuable information to specification writers. An enforceable specification must be realistic statistically, in the sense that the required tolerance limits reasonably reflect (1) the random variation inherent in the material itself and (2) the error of measurement (sampling and testing). In addition, each specification requirement should satisfy some useful engineering or control purpose: there should be a good reason for its existence. The comparison of the results of the analysis of actual test data with existing specification requirements can provide a measure of how well a specification is being met and can indicate the suitability and practicality of the required limits or tolerances. This paper discusses and illustrates methods of comparing specification limits with actual variation of the properties of selected materials and mixtures as shown by the results of field and laboratory tests. The data used were obtained from the results of tests made in various States on bituminous paving mixtures, on asphalt cement and aggregate for flexible pavement, and on subbase material.

    Author Information:

    Warden, W. B.
    Miller-Warden Associates, Raleig, N.C.

    Sandvig, L. D.
    Miller-Warden Associates, Raleig, N.C.

    Committee/Subcommittee: D04.95

    DOI: 10.1520/STP44578S