The influence of inorganic salts on some soil mechanical parameters of clays

  • Stadtbäumer F. J. 
Section 13 Engineering Geology


The variability of soil mechanics parameters with inorganic salts (Na-, K-, Mg- and Ca-chloride) in different concentration were examined for three almost monomineralic clays (bentonite, illite, kaolin) and on clays with different mineralogical compositions (London Clay, Quick Clay).

The mineralogical-chemical tests consisted of the determination of the clay mineralogical composition, of the content of calcium carbonate and organic matter, of particular anions and cations, of the cation exchange capacity, and of the specific surface area. The soil mechanics behaviour was characterized by the study of the grain density, grain size distribution, ATTERBERG consistency limits, plasticity index, water absorption coefficient (ENSLIN test), stiffness and swelling modulus (oedometer test) and shear strength (direct shear test).


Clay Bentonite Kaolin Liquid Limit Plasticity Index 

L’influence De Sels Inorganiques Sur Quelques Parametres De Mecanique Des Argiles


La variabilité des paramètres de mécanique des sols causée par des sels inorganiques (chlorures de Na, K, Mg et Ca) en concentrations différentes a été examinée sur trois argiles quasi-monominérales (bentonite, illite, kaolin) et sur des argiles de compositions minéralogiques différentes (London Clay, Quick Clay).

La recherche portait sur la détermination de la composition minéralogique des argiles, les teneurs en carbonate de calcium et en matières organiques, les anions et cations particuliers, la capacité des cations échangeables et la surface spécifique. Les propriétés mécaniques des sols ont été caractérisées par l’étude de la densité des grains, la courbe granulométrique, les limites de consistence d’ATTERBERG, l’indice de plasticité, le coefficient d’absorption d’eau, le module de rigidité et le gonflement (essai oedométrique), la résistance au cisaillement (essai de cisaillement direct).


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  1. BJERRUM L. (1967): Engineering geology of Norwegian normally-consolidated marine clays as related to settlements of buildings. — Géotechnique, vol. XVII, no. 2, pp. 81–118.Google Scholar
  2. COLLINS K. — MC GOWN A. (1974): The form and function of microfabric features in a variety of natural soils. — Géotechnique, vol. XXIV, no. 2, pp. 223–254.CrossRefGoogle Scholar
  3. LØKEN T. (1970): Recent research at the Norwegian Geotechnical Institute concerning the influence of chemical additions on quick clay. — Geol. Foren. Forh., vol. 92, part 2, pp. 133–147.CrossRefGoogle Scholar
  4. MATTIAT B. (1969): Eine Methode zur elektronenmikroskopischen Untersuchung des Mikrogefüges in tonigen Sedimenten. — Geol. Jb., vol. 88, pp. 87–111.Google Scholar
  5. MOUM J. — ROSENQVIST I.Th. (1961): The mechanical properties of montmorillonitic and illitic clays related to the electrolytes of the pore water. — Proc. 5th Int. Conf. Soil Mech. Found. Engng., vol. I, pp. 263–267.Google Scholar
  6. O’BRIEN N.R. (1971): Fabric of kaolinite and illite floccules. — Clays a. Clay Min., vol. 19, pp. 353–359.CrossRefGoogle Scholar
  7. PUSCH R. (1973): Influence of salinity and organic matter on the formation of clay microstructure. — Proc. Int. Symp. Soil Structure, pp. 161–173.Google Scholar
  8. ROSENQVIST I.Th. (1955): Investigations in the clay-electrolytewater system. — Norges Geotekn. Inst. Publ., no. 9, 125 pp.Google Scholar
  9. ROSENQVIST I.Th. (1957): Soil properties and their measurement. — Proc. 4th Int. Conf. Soil Mech. Found. Engng., vol. 2, pp. 427–432.Google Scholar
  10. SEED H.B. — WOODWARD R.J. — LUNDGREN R. (1964): Fundamental aspects of the Atterberg limits. — J. Soil Mech. Found. Div., Proc. ASCE, vol. 90, SM 6, pp. 75–105.Google Scholar
  11. SIDES G. — BARDEN L. (1971): The microstructure of dispersed and flocculated samples of kaolinite, illite, and montmorillonite. — Canad. Geotechn. J., vol. 8, no. 3, pp. 391–399.CrossRefGoogle Scholar
  12. SKEMPTON A.W. (1953): The colloidal ”activity” of clays. — Proc. 3rd Int. Conf. Soil Mech. Found. Engng., vol. I, pp. 57–61.Google Scholar

Copyright information

© International Association of Engineering Geology 1976

Authors and Affiliations

  • Stadtbäumer F. J. 
    • 1
  1. 1.Geological InstituteUniversity of MünsterGermany

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