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    Physical and Chemical Tests of Mineral Aggregates and their Significance

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    This report on the physical and chemical tests of aggregates reviews the important literature pertaining to the subject and presents a selected bibliography. The development of aggregate test techniques is traced, and the applicability of these techniques to present-day aggregate usage is discussed. Present standard tests used for specification control of quality are described and evaluated. Included in this category are the tests for deleterious substances. Research techniques which have been used to determine aggregate properties are described. These include mineralogical identification tests, volume change, elastic properties, porosity, reactivity with alkalies, and simulated service tests such as stripping of bituminous films and accelerated weathering of concrete. Although most commonly used for obtaining design information, the specific gravity and absorption tests are included in this section. It is concluded that the commonly accepted methods for determining the suitability of aggregate are inadequate. Valuable data may be obtained from procedures indicating fundamental properties of the aggregate but probably the most satisfactory aggregate tests are those which simulate as closely as possible the conditions of service required of the aggregate.

    Author Information:

    Sweet, Harold S.
    Research Engineer, Purdue University, Lafayette, Ind.

    Committee/Subcommittee: C09.21

    DOI: 10.1520/STP46211S