Cyclic Behavior of Fine-Grained Soils at Different pH Values

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Title Cyclic Behavior of Fine-Grained Soils at Different pH Values
Author Gratchev, Ivan; Sassa, Kyoji
Journal Name Journal of Geotechnical & Geoenvironmental Engineering
Year Published 2009
Place of publication United States
Publisher American Society of Civil Engineering
Abstract The effects of pH on the liquefaction susceptibility of fine-grained soils were examined by performing undrained cyclic ring-shear tests on artificial mixtures and a natural soil under different pH conditions. Solutions of diluted sulphuric acid H2SO4 and dissolved sodium hydroxide NaOH were used to create acidic and alkaline environments, respectively, while distilled water was used as a reference liquid. Low plasticity kaolin and illite-sand mixtures and a medium plasticity bentonite-sand mixture were selected to investigate the influence of plasticity and clay mineralogy on the pH-dependent response of soil to cyclic loading. The results showed that the effects of pH were more pronounced for the medium plasticity mixture, and depended greatly on the mineralogy of clay fraction. For example, in an acidic medium, the kaolin-sand mixture became slightly more resistant to liquefaction while the illite-sand mixture became more susceptible to liquefaction. The bentonite-sand mixture was observed to be the most sensitive to changes in pH environment. While resistant to liquefaction in distilled water, it rapidly liquefied in acidic and alkaline mediums. Cyclic behavior of a medium plasticity soil, which was collected from an earthquake-induced landslide, was also affected by changes in pH. Although being overall resistant to liquefaction regardless of pH, it decreased its cyclic strength in both acidic and alkaline environments. Based on the available literature and the obtained results, an attempt was made to explain the influence of pH on the undrained cyclic behavior of fine-grained soils.
Peer Reviewed Yes
Published Yes
Alternative URI
Volume 135
Issue Number 2
Page from 271
Page to 279
ISSN 1090-0241
Date Accessioned 2011-06-23
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Civil Geotechnical Engineering
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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