Determination of Plastic and Liquid Limits Using the Reverse Extrusion Technique

    Volume 33, Issue 1 (January 2010)

    ISSN: 0149-6115


    Published Online: 5 November 2009

    Page Count: 9

    Kayabali, Kamil
    Geological Engineering Dept., Ankara Univ., Ankara,

    Tufenkci, Osman Oguz
    Akademi Soil Investigations, Inc., Ankara,

    (Received 26 October 2008; accepted 16 September 2009)


    Consistency limits are fundamental properties of fine grained soils. The techniques used today to determine these parameters are operator dependent; their repeatability is low. In order to overcome and/or reduce those factors affecting the results of conventional testing methods, the reverse extrusion technique was evaluated. Thirty-one inorganic soil samples were used in the experiments. In order to produce a reliable basis for the plastic and liquid limits, a relatively broad database was constituted using the conventional consistency limit tests. Extrusion pressures were then obtained and plotted for different water contents for each sample. A linear relationship was observed among the water content and the logarithm of the extrusion pressure. The extrusion pressures corresponding to the average plastic and liquid limits of the conventional method show a normal distribution about certain values. A more reliable, economical, and robust device with greater repeatability is proposed. The presented approach shows promise in providing a better index parameter to characterize fine grained soils.

    Paper ID: GTJ102209

    DOI: 10.1520/GTJ102209

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    Title Determination of Plastic and Liquid Limits Using the Reverse Extrusion Technique
    Symposium , 0000-00-00
    Committee D18