Effect of pH on the geotechnical properties of laterite

Sunil, B. M.; Nayak, Sitaram; Shrihari, S.

doi:10.1016/j.enggeo.2005.09.039

Cited by 71 publications

(31 citation statements)

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“…Contaminants get adsorbed onto the clay particles leading to marked changes in the geotechnical and chemical characteristics of the soils. Past work (Foreman and Daniel 1986;Gnanapragasam et al 1995;Kamon et al 1996;Khan and Pise 1994;Kirov 1989;Kumapley and Ishola 1985;Mesri and Olson 1970;Nayak et al 2007;Roque and Didier 2006;Sivapullaiah and Savitha 1997;Soule and Burns 2001;Sridharan et al 1981;Sridharan and Venkatappa Rao 1979;Sunil et al 2006Sunil et al , 2008Uppot and Stephenson 1989) has shown that the index and engineering properties of contaminated soil tend to change due to chemical reactions between the soil mineral particles and the contaminant.…”

Section: Introductionmentioning

confidence: 96%

Interactions Between Soils and Laboratory Simulated Electrolyte Solution

et al. 2010

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To study the impact of salt water intrusion on two types of soils from west coast region of India were investigated in the laboratory. The key characteristics evaluated included Atterberg limits, compaction characteristics, hydraulic conductivity and chemical characteristics of selected soils. The sea at this coast receives effluent from different points and hence the characteristics change with time and locality. Therefore, to maintain uniform composition, 0.5 N sodium chloride solution (NaCl) was prepared in the laboratory and batch tests were used to determine the immediate effect on soils. Soil specimens were prepared by mixing the soils with 0.5 N NaCl in the increments of 0, 5, 10 and 20% by weight to vary the degree of contamination. Experimental results of soils mixed with 0.5 N NaCl showed that the maximum dry density increases and the optimum moisture content (OMC) decreases with increasing sodium chloride concentration. The study also revealed that the hydraulic conductivity of the soils tested increases with increase in sodium chloride concentration. The Atterberg limits of contaminated specimens show a remarkable change when compared with uncontaminated specimens.

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Section: Introductionmentioning

confidence: 96%

Interactions Between Soils and Laboratory Simulated Electrolyte Solution

et al. 2010

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“…Subsequent to these studies, Olson and Mesri (1970), Sridharan and Rao (1973) carried out compression tests on bentonite and kaolinite with various chemical liquids as pore fluids and noted the important role of clay mineralogy in the soil behavior. More recently, Meegoda and Ratnaweera (1994), Chen et al (2000), Wang and Siu (2006b), Sunil et al (2006), Gajo and Maines (2007) have provided useful insight into the effects of the dielectric constant of organic pore fluids, pH environment, and electrolyte concentration on the compressibility of clays.…”

Section: Introductionmentioning

confidence: 97%

Compressibility of natural soils subjected to long-term acidic contamination

Gratchev

Towhata

2010

Environ Earth Sci

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This paper presents the results of a systematic analysis aimed at establishing whether acidic pore fluids can affect the properties of natural soils, in particular their compressibility. Marine deposits with different mineral compositions and undisturbed soil structure were collected for this research from three coastal areas in Japan. Pleistocene clays from the Osaka and Ariake Bays were obtained from boreholes at a depth of more than 10 m, whereas the Kawasaki mud, a relatively young deposit of Holocene, was dredged from the bed of the Tokyo Bay. Soil specimens were placed in special containers, which were designed to reproduce the process of long-term soilwater-chemical interaction, and leached with solutions of sulfuric acid for different periods of time, ranging from 1 to 9 months. At the end of each time interval, standard compression tests were performed to study the behavior of soil in an acidic environment. It was found that clay mineralogy and soil structure had a significant effect on the compressibility of clays at low pH. In the case of the Osaka and Ariake clays, the compressibility significantly increased with a decrease in pH values, a finding that was primarily attributed to changes in the soil's structure. In contrast, the effect of acidic leaching on the properties of Kawasaki mud was observed to be the opposite. Laboratory data showed that in acidic medium the compressibility of soil decreased presumably due to the collapse of the diffuse double layer.

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“…However, the traditional stabilizers are not always readily acceptable in engineering construction because of environmental threat. The treated soils always pose a threat to the environment by changing the soil pH (Rollings and Burkes, 1999;Sunil et al, 2006;Indraratna et al, 2012). The growth of vegetables and the quality of groundwater are also affected.…”

Section: Introductionmentioning

confidence: 99%