Mineral Aggregates for Bituminous Construction

    Published: Jan 1948

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    Aggregates for bituminous construction fall naturally into two general categories“those that are processed or “manufactured” to conform to rather stringent specifications for use in high-type construction, and those that are simply taken from pits, stream beds, or other sources and, with no special preparation or with only a nominal amount of processing, are used under much less stringent specifications for the low-cost and intermediate types of construction. Considering the country as a whole, there is a wide range in the quality and character of the aggregates generally available. Because of these differences, the use of standard specifications in either the high-cost or the low-cost field is, at times, entirely impractical although standard specifications are always helpful as guides in the selection and preparation of the local materials. Mr. R. W. Crum in his paper introducing the 1929 A.S.T.M. Symposium on Mineral Aggregates (1), states the case very well in his comment that, “It is doubtful whether it will ever be possible to devise standard specifications for aggregates that will be anything more than a form upon which to hang the requirements best adapted to the different localities.” In the selection of aggregates for bituminous surfacings, the first consideration is the type of construction, that is, whether it is macadam, surface treatment, or a mixture. Also important is the class of service that the road will have to provide.

    Author Information:

    Pauls, J. T.
    Principal Highway Engineer and Civil Engineer, Public Roads Administration, Washington, D. C.,

    Carpenter, C. A.
    Principal Highway Engineer and Civil Engineer, Public Roads Administration, Washington, D. C.,

    Paper ID: STP46218S

    Committee/Subcommittee: D04.20

    DOI: 10.1520/STP46218S

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