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Geomechanics and Engineering Volume 15, Number 6, August30 2018 , pages 1135-1141 DOI: https://doi.org/10.12989/gae.2018.15.6.1135 |
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Control of phosphoric acid induced volume change in clays using fly ash |
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Rama Vara Prasad Chavali and P. Hari Prasad Reddy
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| Abstract | ||
| Volume changes of soils induced by inorganic acids cause severe foundation and superstructure failures in industrial buildings. This study aimed to assess the potential of fly ash to control volume changes in soils under acidic environment. Two soils such as black cotton soil predominant with montmorillonite and kaolin clay predominant with kaolinite were used for the present investigation. Both soils exhibited an increase in swelling subjected to phosphoric acid contamination. Ion exchange reactions and mineralogical transformations lead to an increase in swelling and a decrease in compressibility in black cotton soil, whereas phosphate adsorption and mineral dissolution lead to an increase in swelling and compressibility in case of kaolin clay. Different percentages of Class F fly ash obtained from Ramagundam national thermal power station were used for soil treatment. Fly ash treatment leads to significant reduction in swelling and compressibility, which is attributed to the formation of aluminum phosphate cements in the presence of phosphoric acid. | ||
| Key Words | ||
| black cotton soil; contamination; fly ash; kaolin clay; phosphoric acid; volume change | ||
| Address | ||
| Rama Vara Prasad Chavali: Department of Civil Engineering, Velagapudi Ramakrishna Siddhartha Engineering College, Vijayawada, Andhra Pradesh 520007, India P. Hari Prasad Reddy: Department of Civil Engineering, National Institute of TechnologyWarangal,Warangal, Telangana 506004, India | ||