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A platform for research: civil engineering, architecture and urbanism
Study on strength and volume change behavior of stabilized black cotton soil with different pH of soil-lime mixes for pavement subgrade
Lime stabilization is a proven technique to improve the subgrade properties of black cotton (BC) soil for pavement construction. However, deciding the optimum lime requirement for varying soil properties from location to location is still a challenge during new road construction. Hence, in this study, an attempt was made to bring out the quick identification of optimum lime dosage by pH test. However, the pH test alone is not sufficient to know the changes in Physico-chemical properties of soil by lime addition. Therefore, investigations were performed by addition of different lime contents with varying curing periods to bring out the effect on strength and volumetric change behavior of BC soil.
The lowest dosage of lime that gives soil-lime mix pH of 12.4 was taken as an optimum dosage or lime fixation point. Further 7% lime was found to be an optimum dosage. Investigations were carried out below, at and above the lime fixation point (5%, 7% and 9%) to determine the changes in properties of the soil. The unconfined compressive strength (UCS) tests were conducted with different curing periods ie 0, 7, 14 & 28 days to achieve the desired strength. The gain in strength and volumetric change of soil was evaluated for three lime dosages by conducting California Bearing Ratio (CBR) and Free Swell Index (FSI) tests respectively. The images of field emission scanning electron microscopy (FESEM) showed flocculation of soil particles resulting in increased strength. The energy dispersive spectroscopy (EDS) study confirmed that change in chemical composition (Si, Ca, Al, Fe and Mg) of lime stabilized soil was responsible for increased strength and reduced volumetric change.
Study on strength and volume change behavior of stabilized black cotton soil with different pH of soil-lime mixes for pavement subgrade
Lime stabilization is a proven technique to improve the subgrade properties of black cotton (BC) soil for pavement construction. However, deciding the optimum lime requirement for varying soil properties from location to location is still a challenge during new road construction. Hence, in this study, an attempt was made to bring out the quick identification of optimum lime dosage by pH test. However, the pH test alone is not sufficient to know the changes in Physico-chemical properties of soil by lime addition. Therefore, investigations were performed by addition of different lime contents with varying curing periods to bring out the effect on strength and volumetric change behavior of BC soil.
The lowest dosage of lime that gives soil-lime mix pH of 12.4 was taken as an optimum dosage or lime fixation point. Further 7% lime was found to be an optimum dosage. Investigations were carried out below, at and above the lime fixation point (5%, 7% and 9%) to determine the changes in properties of the soil. The unconfined compressive strength (UCS) tests were conducted with different curing periods ie 0, 7, 14 & 28 days to achieve the desired strength. The gain in strength and volumetric change of soil was evaluated for three lime dosages by conducting California Bearing Ratio (CBR) and Free Swell Index (FSI) tests respectively. The images of field emission scanning electron microscopy (FESEM) showed flocculation of soil particles resulting in increased strength. The energy dispersive spectroscopy (EDS) study confirmed that change in chemical composition (Si, Ca, Al, Fe and Mg) of lime stabilized soil was responsible for increased strength and reduced volumetric change.
Study on strength and volume change behavior of stabilized black cotton soil with different pH of soil-lime mixes for pavement subgrade
Int. J. Pavement Res. Technol.
Chitragar, Srinivas F. (author) / Shivayogimath, Chandrashekhar B. (author) / Mulangi, Raviraj H. (author)
International Journal of Pavement Research and Technology ; 14 ; 543-548
2021-09-01
6 pages
Article (Journal)
Electronic Resource
English
Study on Physical and Chemical Change Behavior of Stabilized Black Cotton Soil for Pavement Subgrade
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