STP623

    Influence of Eroding Solution Composition on Dispersive Behavior of a Compacted Clay Shale

    Published: Jan 1977


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    Abstract

    The pinhole test was used to determine the boundaries between dispersive and nondispersive behavior for a clay shale with respect to acidity and salt concentration in the erosion solution. It was found that, for this soil, a decrease in pH of the eroding water to less than about 4 (using hydrochloric acid) or an increase to greater than about 11 (using calcium hydroxide or sodium hydroxide) caused a change from dispersive to nondispersive behavior. Similarly, increasing the salt concentration of the eroding water at its natural pH of 6.3 to 0.1 N calcium chloride or 0.5 N sodium chloride caused erosion to stop.

    Keywords:

    clays, acidity, alkali metals, calcium compounds, chemical properties, shales, compaction, concentration, dispersions, gradients, ions, laboratory equipment, leaching, pH, pinhole tests, piping, salinity, soil erosion, water analysis


    Author Information:

    Statton, CT
    Geological engineer, Woodward-Clyde Consultants, Clifton, N.J.

    Mitchell, JK
    Professor of civil engineering, University of California, Berkeley, Calif


    Paper ID: STP27003S

    Committee/Subcommittee: D18.02

    DOI: 10.1520/STP27003S


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