Stabilisation of Kuttanad Soil Using Calcium and Sodium Lignin Compounds

Sabitha, B. S.; Evangeline, Y. Sheela

doi:10.1007/978-981-33-6444-8_22

Cited by 7 publications

(2 citation statements)

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“…The chitosan procured from Swakit Biotech appeared in the form of flakes, with a moisture content and degree of acetylation of 6-8% and greater than 88%. The viscosity is reported in the range of 75-150 csp with a density of 0.25 g/cm 3 . The procured soil was treated with various doses of chitosan for the current experimental investigation.…”

Section: Biopolymermentioning

confidence: 99%

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Shrinkage and Consolidation Characteristics of Chitosan-Amended Soft Soil—A Sustainable Alternate Landfill Liner Material

Rasheed,

Moghal,

Jannepally

et al. 2023

Buildings

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Kuttanad is a region that lies in the southwest part of Kerala, India, and possesses soft soil, which imposes constraints on many civil engineering applications owing to low shear strength and high compressibility. Chemical stabilizers such as cement and lime have been extensively utilized in the past to address compressibility issues. However, future civilizations will be extremely dependent on the development of sustainable materials and practices such as the use of bio-enzymes, calcite precipitation methods, and biological materials as a result of escalating environmental concerns due to carbon emissions of conventional stabilizers. One such alternative is the utilization of biopolymers. The current study investigates the effect of chitosan (biopolymer extracted from shrimp shells) in improving the consolidation and shrinkage characteristics of these soft soils. The dosages adopted are 0.5%, 1%, 2%, and 4%. One-dimensional fixed ring consolidation tests indicate that consolidation characteristics are improved upon the addition of chitosan up to an optimum dosage of 2%. The coefficient of consolidation increases up to seven times that of untreated soil, indicating the acceleration of the consolidation process by incorporating chitosan. The shrinkage potential is reduced by 11% after amendment with 4% chitosan and all the treated samples exhibit zero signs of curling. Based on the findings from consolidation and shrinkage data, carbon emission assessments are carried out for a typical landfill liner amended with an optimum dosage of chitosan. In comparison to conventional stabilizers like cement and lime, the results indicate that chitosan minimized carbon emissions by 7.325 times and 8.754 times, respectively.

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Section: Biopolymermentioning

confidence: 99%

“…The Kuttanad region is a stretch of low-lying land on the west coast of India and comprises silt and clay fraction [2]. A major portion of the region remains submerged during the monsoon season every year [3]. The behavior of these soft soils is predominantly dependent on the mineral type and microstructural arrangement.…”

Section: Introductionmentioning

confidence: 99%