STP599

    Shrinkage of Soil Specimens During Preparation for Porosimetry Tests

    Published: Jan 1976


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    Abstract

    Various methods of removing moisture from small soil samples were investigated. The samples were to be tested by mercury porosimetry, and one requirement is a constant volume drying process. Air-drying, oven-drying and freeze-drying procedures were used. Three different clay types were used: kaolinite, montmorillonite, and an illite. The clays were fully saturated, and compaction was achieved by using static pressure.

    Freeze drying is the best practical method of drying the soil samples, as it produces the least amount of shrinkage in the soil. In certain instances, air drying and oven drying may produce satisfactory results. Total drying time for freeze drying can be accomplished in 5 to 10 h.

    A simple laboratory freeze-drying system is described and operating procedures and principles discussed.

    The results are applicable to the preparation of small size soil samples where it is desired to remove soil moisture and, at the same time, minimize disturbance to the soil structure.

    Keywords:

    soils, samples, clays, shrinkage, drying, freezing, moisture content, vacuum, mercury porosimetry, tests


    Author Information:

    Zimmie, TF
    Assistant professor and graduate student, Rensselaer Polytechnic Institute, Troy, N.Y.

    Almaleh, LJ
    Assistant professor and graduate student, Rensselaer Polytechnic Institute, Troy, N.Y.


    Paper ID: STP39084S

    Committee/Subcommittee: D18.09

    DOI: 10.1520/STP39084S


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