Sivapullaiah Puvvadi - Academia.edu (original) (raw)
Papers by Sivapullaiah Puvvadi
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The Journal of Solid Waste Technology and Management, 2017
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Geo-Chicago 2016, 2016
The interaction of ions (calcium, alumina, silica, and sulfate) in the presence of water is very ... more The interaction of ions (calcium, alumina, silica, and sulfate) in the presence of water is very complex to indentify, and hence, to predict the behaviour of soil. An attempt has been made to understand the mineralogical and micro-structural changes due to soil-lime-gypsum reactions. Further, the associated mechanisms behind changes in the properties of lime treated gypseous soil with fly ash are presented. A series of experimental works are performed to find out the compaction characteristics, strength and swell behaviour of lime treated soil with gypsum and fly ash. The samples collected after completion of experimental works are used for micro-analysis (X-ray diffraction and scanning electron microscope). The results show that use of fly ash enhances the strength of lime treated gypseous soil by 1.92 folds. Also, the rapid swell, which is observed in gypseous soil with lime treatment, is reduced by 33% after using fly ash. The micro-analysis confirms that formations of cementitious compounds such as calcium silicate hydrate (CSH), calcium aluminum oxide hydrate (CAOH), calcium aluminum silicate hydroxide hydrate (CASHH) and ettringite needles lead to change in the geotechnical properties of soil. Further, it has been found that availability of water influences significantly on the formation of ettringite minerals and, thereby subsequent changes in properties of soil.
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Clay Research, 2003
Landfills are increasingly used to dispose of all types of waste. Leachate generated by precipita... more Landfills are increasingly used to dispose of all types of waste. Leachate generated by precipitation and other liquids within the refuse is free to flow from unlined landfills into surface water and groundwater, potentially polluting drinking water aquifers. Even though clay liners have many limitations, they are still used since they are natural, relatively inert, and generally available; moreover, they are inexpensive, have large attenuation capacity, and resist damage and puncture. A major problem with clay liners is that chem. wastes or ...
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Geotechnical and Geological Engineering, 2010
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Journal of Earth System Science, 2012
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International Journal of the Physical Sciences
Contaminant transport through soil liners with low hydraulic conductivity is both by advection an... more Contaminant transport through soil liners with low hydraulic conductivity is both by advection and diffusion processes though the diffusion process is dominate. Diffusion coefficient of migrating species has to be considered to calculate the velocity of contaminant flume. Diffusion through a network of clay particles is slower and porous media diffusion coefficient (Dp) is used to consider tortuous flow paths around clay particles by tortuosity factor. Attenuation processes that occur further alter the diffusion coefficient while contaminants ...
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Soils and Foundations
The use of lime and fly ash to improve the properties of certain types of soil is well establishe... more The use of lime and fly ash to improve the properties of certain types of soil is well established. However, the potential of fly ash to control the adverse effects of lime-treated gypseous/sulphatic soil has not been well investigated. In the present work, an attempt is made to quantify the fly ash content used to suppress the susceptible behavior of lime-treated gypseous soil. Series of one-dimensional swell and compressibility analyses are performed on various combinations of expansive soil with a predominance of montmorillonite mineral containing lime, gypsum (0–6%), and fly ash (0–30%). It is observed that the volume change behavior of the lime-treated gypseous soil is not controlled completely by addition of fly ash. However, the maximum improvement in the volume change behavior of the lime-treated gypseous soil is observed with a 20% fly ash content, and hence, can be taken as the Optimum Fly ash Content (OFC). Micro-analyses revealed that the relative dominance of the change in gradation and the formation of cementitious compounds of different compositions and ettringite crystals are the key factors in controlling the volume change behavior of lime-treated gypseous soil with fly ash. However, several factors, such as the types of minerals present in the soil, the types of fly ash and lime, and other physico-chemical environmental conditions (temperature, method of curing, and so on), are seen in the present study to affect the value of the obtained OFC.
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Applied Clay Science
An attempt has been made to examine the role of fly ash content (0–30%) to control undesirable st... more An attempt has been made to examine the role of fly ash content (0–30%) to control undesirable strength loss in lime–treated expansive soil containing gypsum (0–6%) after curing for different periods up to one year. Further, detailed experimental investigations have been performed to assess the plasticity, swell index and compaction behavior of soil treated with these additives. Results of the strength behavior revealed that a significant effect of higher fly ash content in the strength development of lime–treated soil is observed after longer curing periods. Presence of increasing amounts of gypsum accelerates early strength gain initially, but reduces long–term strength gain in soil–lime–fly ash mixes. Fly ash improves the strength of lime–treated gypseous soil. However, beneficial use of fly ash to improve the strength of lime treated gypseous soil depends on the amount of gypsum present in the soil and length of curing periods. Micro–analyses (XRD and SEM) revealed that the strength development is controlled by reaction products formed such as cementitious compounds and ettringite crystals.
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Geotechnical Testing Journal
An attempt was made to study the efficiency of fly ash and lime on the volume change behavior of ... more An attempt was made to study the efficiency of fly ash and lime on the volume change behavior of soil to mask the effect of gypsum. Swell and compressibility of soil mixed with 10 % fly ash and treated with various lime contents (0 %–6 %) in the absence and presence of 1 % gypsum after curing for different periods of up to 28 days were studied. It was established that an increase in lime content improved swell and compressibility in the soil-fly ash mix but that it led to rapid swelling and increased compressibility in the presence of gypsum, particularly when the specimens were not cured. Higher amounts of lime and a longer curing period were found to be essential to conquer the adverse effect of gypsum. The behavioral changes in the swell and compressibility of both specimens, with and without gypsum, were attributed to consequent alterations in the microstructure by the formation of cementitious products and the growth of ettringite crystal. It was observed that the formation of cementitious compounds with a curing period enables to the compound to overcome the adverse effect of ettringite, leading to control of undesirable volume change behavior.
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Japanese Geotechnical Society Special Publication
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Proceedings of the Institution of Civil Engineers - Ground Improvement, 1999
... Dayal U., Chandra S. and Bohra NC (1989) Geotechnical Investigation of Ash Properties for Dyk... more ... Dayal U., Chandra S. and Bohra NC (1989) Geotechnical Investigation of Ash Properties for Dyke Construction at Ramagun-dam Super Power Thermal Project. ... Sivapullaiah PV, Sridharan A. and Prashanth JP (1995) Optimisation of lime content of ¯y ash. ...
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The Journal of Solid Waste Technology and Management, 2014
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Environmental Management and Sustainable Development, 2012
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Journal of Inorganic and Nuclear Chemistry, 1976
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Inorganic and Nuclear Chemistry Letters, 1977
In continuation of our work on the effect of the anion on the coordination chemistry of the rare-... more In continuation of our work on the effect of the anion on the coordination chemistry of the rare-earth metal ions, we have now extended our studies to 4-picoline-N-oxide (4-Pie NO) complexes of rare-earth bromides. By ohangi~ the method of preparation Harrison and Watsom (1) have prepared two types of Sm (IIl) complexes and three types of Eu (III) complexes of 4-pioollne-N-Oxide in the presence of perchlorate ions. We have isolated two types of pyridine-N-Oxide complexes of rare-earth bromides, also by changing the method ...
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Advances in Unsaturated Soil, Seepage, and Environmental Geotechnics, 2006
Investigations were carried out to bring out the effect of varying concentration of caustic alkal... more Investigations were carried out to bring out the effect of varying concentration of caustic alkali, NaOH, solutions on the volume change behaviour of two swelling soils containing different types of clay minerals. The effect of contamination is studied not only during contamination but also on already contaminated samples. Bentonite and natural Indian black cotton soil containing interstratified illite‐smectite mineral were contaminated with caustic soda solutions of 1 N and 4 N concentration. The oedometer tests revealed ...
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SOILS AND FOUNDATIONS, 2007
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Bookmarks Related papers MentionsView impact
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The Journal of Solid Waste Technology and Management, 2017
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Geo-Chicago 2016, 2016
The interaction of ions (calcium, alumina, silica, and sulfate) in the presence of water is very ... more The interaction of ions (calcium, alumina, silica, and sulfate) in the presence of water is very complex to indentify, and hence, to predict the behaviour of soil. An attempt has been made to understand the mineralogical and micro-structural changes due to soil-lime-gypsum reactions. Further, the associated mechanisms behind changes in the properties of lime treated gypseous soil with fly ash are presented. A series of experimental works are performed to find out the compaction characteristics, strength and swell behaviour of lime treated soil with gypsum and fly ash. The samples collected after completion of experimental works are used for micro-analysis (X-ray diffraction and scanning electron microscope). The results show that use of fly ash enhances the strength of lime treated gypseous soil by 1.92 folds. Also, the rapid swell, which is observed in gypseous soil with lime treatment, is reduced by 33% after using fly ash. The micro-analysis confirms that formations of cementitious compounds such as calcium silicate hydrate (CSH), calcium aluminum oxide hydrate (CAOH), calcium aluminum silicate hydroxide hydrate (CASHH) and ettringite needles lead to change in the geotechnical properties of soil. Further, it has been found that availability of water influences significantly on the formation of ettringite minerals and, thereby subsequent changes in properties of soil.
Bookmarks Related papers MentionsView impact
Clay Research, 2003
Landfills are increasingly used to dispose of all types of waste. Leachate generated by precipita... more Landfills are increasingly used to dispose of all types of waste. Leachate generated by precipitation and other liquids within the refuse is free to flow from unlined landfills into surface water and groundwater, potentially polluting drinking water aquifers. Even though clay liners have many limitations, they are still used since they are natural, relatively inert, and generally available; moreover, they are inexpensive, have large attenuation capacity, and resist damage and puncture. A major problem with clay liners is that chem. wastes or ...
Bookmarks Related papers MentionsView impact
Geotechnical and Geological Engineering, 2010
Bookmarks Related papers MentionsView impact
Journal of Earth System Science, 2012
Bookmarks Related papers MentionsView impact
International Journal of the Physical Sciences
Contaminant transport through soil liners with low hydraulic conductivity is both by advection an... more Contaminant transport through soil liners with low hydraulic conductivity is both by advection and diffusion processes though the diffusion process is dominate. Diffusion coefficient of migrating species has to be considered to calculate the velocity of contaminant flume. Diffusion through a network of clay particles is slower and porous media diffusion coefficient (Dp) is used to consider tortuous flow paths around clay particles by tortuosity factor. Attenuation processes that occur further alter the diffusion coefficient while contaminants ...
Bookmarks Related papers MentionsView impact
Soils and Foundations
The use of lime and fly ash to improve the properties of certain types of soil is well establishe... more The use of lime and fly ash to improve the properties of certain types of soil is well established. However, the potential of fly ash to control the adverse effects of lime-treated gypseous/sulphatic soil has not been well investigated. In the present work, an attempt is made to quantify the fly ash content used to suppress the susceptible behavior of lime-treated gypseous soil. Series of one-dimensional swell and compressibility analyses are performed on various combinations of expansive soil with a predominance of montmorillonite mineral containing lime, gypsum (0–6%), and fly ash (0–30%). It is observed that the volume change behavior of the lime-treated gypseous soil is not controlled completely by addition of fly ash. However, the maximum improvement in the volume change behavior of the lime-treated gypseous soil is observed with a 20% fly ash content, and hence, can be taken as the Optimum Fly ash Content (OFC). Micro-analyses revealed that the relative dominance of the change in gradation and the formation of cementitious compounds of different compositions and ettringite crystals are the key factors in controlling the volume change behavior of lime-treated gypseous soil with fly ash. However, several factors, such as the types of minerals present in the soil, the types of fly ash and lime, and other physico-chemical environmental conditions (temperature, method of curing, and so on), are seen in the present study to affect the value of the obtained OFC.
Bookmarks Related papers MentionsView impact
Applied Clay Science
An attempt has been made to examine the role of fly ash content (0–30%) to control undesirable st... more An attempt has been made to examine the role of fly ash content (0–30%) to control undesirable strength loss in lime–treated expansive soil containing gypsum (0–6%) after curing for different periods up to one year. Further, detailed experimental investigations have been performed to assess the plasticity, swell index and compaction behavior of soil treated with these additives. Results of the strength behavior revealed that a significant effect of higher fly ash content in the strength development of lime–treated soil is observed after longer curing periods. Presence of increasing amounts of gypsum accelerates early strength gain initially, but reduces long–term strength gain in soil–lime–fly ash mixes. Fly ash improves the strength of lime–treated gypseous soil. However, beneficial use of fly ash to improve the strength of lime treated gypseous soil depends on the amount of gypsum present in the soil and length of curing periods. Micro–analyses (XRD and SEM) revealed that the strength development is controlled by reaction products formed such as cementitious compounds and ettringite crystals.
Bookmarks Related papers MentionsView impact
Geotechnical Testing Journal
An attempt was made to study the efficiency of fly ash and lime on the volume change behavior of ... more An attempt was made to study the efficiency of fly ash and lime on the volume change behavior of soil to mask the effect of gypsum. Swell and compressibility of soil mixed with 10 % fly ash and treated with various lime contents (0 %–6 %) in the absence and presence of 1 % gypsum after curing for different periods of up to 28 days were studied. It was established that an increase in lime content improved swell and compressibility in the soil-fly ash mix but that it led to rapid swelling and increased compressibility in the presence of gypsum, particularly when the specimens were not cured. Higher amounts of lime and a longer curing period were found to be essential to conquer the adverse effect of gypsum. The behavioral changes in the swell and compressibility of both specimens, with and without gypsum, were attributed to consequent alterations in the microstructure by the formation of cementitious products and the growth of ettringite crystal. It was observed that the formation of cementitious compounds with a curing period enables to the compound to overcome the adverse effect of ettringite, leading to control of undesirable volume change behavior.
Bookmarks Related papers MentionsView impact
Japanese Geotechnical Society Special Publication
Bookmarks Related papers MentionsView impact
Proceedings of the Institution of Civil Engineers - Ground Improvement, 1999
... Dayal U., Chandra S. and Bohra NC (1989) Geotechnical Investigation of Ash Properties for Dyk... more ... Dayal U., Chandra S. and Bohra NC (1989) Geotechnical Investigation of Ash Properties for Dyke Construction at Ramagun-dam Super Power Thermal Project. ... Sivapullaiah PV, Sridharan A. and Prashanth JP (1995) Optimisation of lime content of ¯y ash. ...
Bookmarks Related papers MentionsView impact
The Journal of Solid Waste Technology and Management, 2014
Bookmarks Related papers MentionsView impact
Environmental Management and Sustainable Development, 2012
Bookmarks Related papers MentionsView impact
Journal of Inorganic and Nuclear Chemistry, 1976
Bookmarks Related papers MentionsView impact
Inorganic and Nuclear Chemistry Letters, 1977
In continuation of our work on the effect of the anion on the coordination chemistry of the rare-... more In continuation of our work on the effect of the anion on the coordination chemistry of the rare-earth metal ions, we have now extended our studies to 4-picoline-N-oxide (4-Pie NO) complexes of rare-earth bromides. By ohangi~ the method of preparation Harrison and Watsom (1) have prepared two types of Sm (IIl) complexes and three types of Eu (III) complexes of 4-pioollne-N-Oxide in the presence of perchlorate ions. We have isolated two types of pyridine-N-Oxide complexes of rare-earth bromides, also by changing the method ...
Bookmarks Related papers MentionsView impact
Advances in Unsaturated Soil, Seepage, and Environmental Geotechnics, 2006
Investigations were carried out to bring out the effect of varying concentration of caustic alkal... more Investigations were carried out to bring out the effect of varying concentration of caustic alkali, NaOH, solutions on the volume change behaviour of two swelling soils containing different types of clay minerals. The effect of contamination is studied not only during contamination but also on already contaminated samples. Bentonite and natural Indian black cotton soil containing interstratified illite‐smectite mineral were contaminated with caustic soda solutions of 1 N and 4 N concentration. The oedometer tests revealed ...
Bookmarks Related papers MentionsView impact
SOILS AND FOUNDATIONS, 2007
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