ROLE OF MINERALOGICAL COMPOSITION IN THE ACTIVITY OF EXPANSIVE SOILS

Heave-susceptible soils often contain swelling clay minerals. Knowledge of the mineralogy of soils and rocks plays a large part in understanding the mechanical behavior of these materials. This knowledge is used to the best advantage when it is combined with information about the engineering properties and geological history of the deposits. The object of this paper is to use the knowledge of microstructure and composition of expansive clayey soils to evaluate the activity as defined by various researchers. Therefore, different kinds of clayey soils were investigated for their index properties, activities, and mineralogical compositions. Samples for study were taken from Madinet Nasr, an area in the suburbs of Cairo where expansive soil deposits predominate. The activities of soil samples were determined by using formulae proposed by different researchers. The values of activities were then correlated to the mineralogical compositions of tested soils. The study indicated that the activity is a property of clay mineral rather than a property of whole sample and confirmed the effect of nonclay mineral or coarse-grained fraction on activity values of expansive soil deposits.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1985/1032/1032-005.pdf
• Summary URL:
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  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • El Sohby, Mohamed A
  • Rabba, Sayyed A
  • Mazen, Ossama
• Publication Date: 1985

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 28-33
• Monograph Title: Evaluation and control of expansive soils
• Serial:
  • Transportation Research Record
  • Issue Number: 1032
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Correlation analysis; Expansive clays; Mechanical properties; Microstructure; Mineralogy; Swelling soils
• Subject Areas: Data and Information Technology; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00458099
• Record Type: Publication
• ISBN: 0309039231
• Files: TRIS, TRB
• Created Date: Sep 30 1988 12:00AM