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Target reliability-based design optimization studies on cohesive soil amended with chitosan and casein for liner
Romana Mariyam Rasheed1, Arif Ali Baig Moghal2, B Munwar Basha3
1Department of Civil Engineering, TKM College of Engineering, Kollam, 691005, India.
Scientific Reports
|June 20, 2024
Summary
Biopolymers like Chitosan and Casein significantly improve organic clay
Area of Science:
- Geotechnical Engineering
- Soil Science
- Materials Science
Background:
- Organic clays present unique challenges in geotechnical applications due to their compressibility.
- Biopolymers offer a sustainable approach to modify soil properties.
Purpose of the Study:
- To investigate the effects of Chitosan and Casein on the compressibility and hydraulic conductivity of organic clay.
- To evaluate the reliability of biopolymer-treated soils as liner materials.
Main Methods:
- Consolidation tests were performed on organic clay treated with varying dosages (0.5%-4%) of Chitosan and Casein.
- Primary and secondary compression indices were determined.
- Hydraulic conductivity was measured.
- Reliability analysis was conducted based on Kmax coefficient of variation (COV).
Main Results:
- Both Chitosan and Casein reduced primary compression index (Cc), with Casein showing a 59% reduction at 4% dosage.
- Secondary compression indices for treated soils were significantly lower than untreated organic soils.
- Chitosan increased hydraulic conductivity, while Casein decreased it.
- Casein-treated soils demonstrated higher reliability indices, exceeding 3 even at 40% COV of Kmax.
Conclusions:
- Chitosan and Casein effectively reduce the compressibility of organic clay.
- Casein shows superior performance as a soil liner material due to enhanced stability and reliability.
- Biopolymer treatment offers a viable method for improving problematic organic soils.
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