Effect of pore water pH on mechanical properties of clay soil

  • Jahangir Abedi KoupaiEmail author
  • Marieh Fatahizadeh
  • Mohammad Reza Mosaddeghi
Original Paper


Water quality, particularly pH, is one of the most important factors that may significantly influence soil physical and mechanical properties leading to damage of structures. This study aimed to investigate the effect of pore water pH on engineering properties of a natural clay soil. The soil was exposed to solutions with different pH values (4, 5, 6, 6.5, 9, 10, and 11) as buffered by acetate and carbonate-bicarbonate. Atterberg consistency limits, unconfined compressive strength, and shear strength parameters of the soil were measured after 90 days of exposure to the solutions. The results indicated that the unconfined compressive strength, shear strength parameters, and liquid limit of the soil increased considerably when the pore fluid had a high pH or a low pH. Thus, the results obviously showed that engineering properties of the soil greatly depend on the pH of pore water.


Water quality Clay pH Soil strength Atterberg limits 



The authors would like to appreciate the staff members of Soil Mechanics Laboratory of “Kermanshah Province Road and Town Planning Office” especially Eng. Mohsen Kaffashi for providing all the necessary measurement devices. Also, we appreciate Prof. Shamsollah Ayoubi of Department of Soil Science, College of Agriculture, Isfahan University of Technology for his helpful discussions.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jahangir Abedi Koupai
    • 1
    Email author
  • Marieh Fatahizadeh
    • 1
  • Mohammad Reza Mosaddeghi
    • 2
  1. 1.Department of Water Engineering, College of AgricultureIsfahan University of TechnologyIsfahanIran
  2. 2.Department of Soil Science, College of AgricultureIsfahan University of TechnologyIsfahanIran

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