STP169

    Petrographic Examination

    Published: Jan 1956


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    Abstract

    Petrographic examination of concrete aggregate is visual examination and analysis of the material in terms of both lithology and properties of the individual particles. The procedure requires use of a hand lens and petrographie and stereo-scopic microscopes; less commonly, X-ray diffraction or differential thermal analysis is a necessary part of the procedure. By petrographie examination, the relative abundance of specific types of rocks and minerals is established; the physical and chemical attributes of each, such as particle shape, surface texture, pore characteristics, hardness, and potential alkali reactivity, are described; coatings are identified and described; and the presence of contaminating substances is determined.


    Author Information:

    Mielenz, RC
    Head, Petrographic Laboratory, Bureau of Reclamation, Denver, Colo.


    Paper ID: STP39438S

    Committee/Subcommittee: C09.65

    DOI: 10.1520/STP39438S


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