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Effect of Addition of Phosphogypsum on Strength and Deformation Behavior of Expansive Soils
Expansive soil poses major problem when they come in contact with water. Few traditional stabilizers like lime, cement, and fly ash are being used for reducing swelling characteristics of expansive soils. However, recently, several studies indicate that the usage of traditional stabilizers are non-sustainable solutions may causes harmful CO2 emissions to the environment and pH spike in groundwater. In this paper, the by-product of phosphorous industry (Phosphogypsum) was investigated as an alternative to traditional stabilizers in reducing swelling characteristics of expansive soils. Two soils of different plasticity were chosen to investigate the effectiveness of Phosphogypsum (PG) as stabilizer. A detailed geotechnical investigation on untreated and treated soils with different percentages PG was carried out. The results indicate that the liquid limit gradually decreases with the increase in the PG up to 10% for Soil A, and 30% for Soil B, beyond which, no significant change in the liquid limit was noticed. At an optimum dosage of 3% PG, unconfined compressive strength of Soil B at 28 days curing increased by 300 kPa compared to an identical untreated sample. For the same chemical dosage, swell pressure reduced from 238 kPa (untreated) to 19 kPa. Similarly, an increase in the strength of 100 kPa with a reduction in the swell pressure of 30 kPa was noticed for Soil A treated with an optimum dosage of 10% PG. It is found that the PG reduces swelling by exchange of cations and formation of cementation bond.
Effect of Addition of Phosphogypsum on Strength and Deformation Behavior of Expansive Soils
Expansive soil poses major problem when they come in contact with water. Few traditional stabilizers like lime, cement, and fly ash are being used for reducing swelling characteristics of expansive soils. However, recently, several studies indicate that the usage of traditional stabilizers are non-sustainable solutions may causes harmful CO2 emissions to the environment and pH spike in groundwater. In this paper, the by-product of phosphorous industry (Phosphogypsum) was investigated as an alternative to traditional stabilizers in reducing swelling characteristics of expansive soils. Two soils of different plasticity were chosen to investigate the effectiveness of Phosphogypsum (PG) as stabilizer. A detailed geotechnical investigation on untreated and treated soils with different percentages PG was carried out. The results indicate that the liquid limit gradually decreases with the increase in the PG up to 10% for Soil A, and 30% for Soil B, beyond which, no significant change in the liquid limit was noticed. At an optimum dosage of 3% PG, unconfined compressive strength of Soil B at 28 days curing increased by 300 kPa compared to an identical untreated sample. For the same chemical dosage, swell pressure reduced from 238 kPa (untreated) to 19 kPa. Similarly, an increase in the strength of 100 kPa with a reduction in the swell pressure of 30 kPa was noticed for Soil A treated with an optimum dosage of 10% PG. It is found that the PG reduces swelling by exchange of cations and formation of cementation bond.
Effect of Addition of Phosphogypsum on Strength and Deformation Behavior of Expansive Soils
Mudliar, Richa (author) / Rajesh, S. (author)
Geo-Congress 2022 ; 2022 ; Charlotte, North Carolina
Geo-Congress 2022 ; 189-198
2022-03-17
Conference paper
Electronic Resource
English
Effect of Addition of Phosphogypsum on Strength and Deformation Behavior of Expansive Soils
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