A Procedure for Determining Volumetric Shrinkage of an Unsaturated Soil

    Volume 12, Issue 3 (September 1989)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Page Count: 7


    Sibley, JW
    Research assistant and senior lecturer, University of Queensland, St. Lucia, Queensland

    Williams, DJ
    Research assistant and senior lecturer, University of Queensland, St. Lucia, Queensland

    Abstract

    Measurement of unsaturated soil volumes can be used to monitor drying shrinkage and allows calculation of the volumetric air content/moisture content relationship. From this relationship, the onset of significant desaturation can be established as a bound to the validity of conventional soil testing under saturated conditions and of conventional analysis procedures for the particular soil.

    Measurement of soil volumes over the full range of drying shrinkage is difficult because the soil is liquid at high-moisture contents, but changes to a deformed, cracked, unsaturated solid when dry. The method of volume measurement should be accurate and consistent, since it is used to calculate small changes in the small volumes of air present in the soil. Ideally, it should not stress the specimen or interfere with drying. Further, the method should be capable of distinguishing any volumes of air in exterior cracks or depressions in the soil surface. Finally, the method should be easily repeatable to enable progressive measurements of soil volume during the drying process. A simple, fast method of soil specimen volume measurement is described, based on measurement of displaced volumes of toluene in a pycnometer-like flask. It is compared with a method of calculating volumes from one-dimensional measurements of specimen length and moisture content during drying.


    Paper ID: GTJ10966J

    DOI: 10.1520/GTJ10966J

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    Author
    Title A Procedure for Determining Volumetric Shrinkage of an Unsaturated Soil
    Symposium , 0000-00-00
    Committee D18