CHEMICAL, MINERALOGICAL, AND COMPRESSIBILITY CHARACTERISTICS OF A COLLAPSIBLE LATERITIC SOIL FROM MINAS GERAIS, BRAZIL

This study is on the mineralogical and geotechnical properties of three horizons of a typical collapsible lateritic soil from Minas Gerais, Brazil. All three horizons are similar chemically and mineralogically. The silt fraction consisted primarily of aggregates cemented by iron oxide minerals. The mineral fraction is dominated by the variable charge minerals, kaolinite, gibbsite, hernatite and goethite, which presents a surface charge dependent on the soil pH. This work suggests that in a partially saturated state, a large fraction of the clayey particles are held together by capillary and interparticle forces. Ionic strength and pH also appear to be important given the variable surface charge. At normal overburden pressures the soil is moderately collapsible. Below 25% moisture, collapsible potential index (CPI) decreased, when soil pH increases. (A) For the covering abstract see IRRD 881647.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 39-44

Subject/Index Terms

Filing Info

  • Accession Number: 00729327
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 90-5410-583-6
  • Files: ITRD
  • Created Date: Dec 12 1996 12:00AM