SEDL / STP / STP623-EB / STP26994S


The Role of Dispersion in the Slaking of Intact Clay

Moriwaki, Y
Senior staff engineer, Woodward-Clyde Consultants, Oakland, Calif.

Mitchell, JK
Professor of Civil Engineering, University of California, Berkeley, Calif.


Pages: 16    Published: Jan 1977


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Abstract

A series of slaking tests was conducted to identify those conditions under which dispersion is the dominant mechanism of clay slaking. Variables investigated were clay mineralogy, adsorbed cation ratios (sodium/calcium), consolidation fluid electrolyte concentration, water content, and slaking fluid electrolyte concentration.

All clays with sodium ions occupying more than 10 percent of the exchange complex exhibited a dispersion slaking regardless of other conditions, provided the electrolyte concentration of the slaking fluid was lower than 10−3 N.

Observed slaking behavior can be classified into four modes: (a) swelling slaking, (b) dispersion slaking, (c) surface slaking, and (d) body slaking.


Keywords:
clays, chemical properties, liquid saturation, illite, ion exchanging, kaolinite, laboratory tests, montmorillonite, shrinkage, slaking, swelling, test methods, moisture content

Paper ID: STP26994S
Committee/Subcommittee: D18.02
DOI: 10.1520/STP26994S
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