Critical appraisal of the behavioral geo-mechanisms of peats/organic soils

Rasheed, Romana Mariyam; Moghal, Arif Ali Baig

doi:10.1007/s12517-022-10396-9

Cited by 10 publications

(3 citation statements)

References 116 publications

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“…The studies have confirmed the presence of montmorillonite, hydromica, kaolinite, quartz, and possibly traces of gibbsite, chlorite, feldspar, and amphibole in the soil [21]. From a geotechnical standpoint, these clays are unfavorable due to their high compressibility, low shear strength, high permeability, and high proportion of organic content [22]. Lack of proper engineering judgment in the past has led to the collapse of embankments and bridges in this region [23].…”

Section: Introductionmentioning

confidence: 80%

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: Introductionmentioning

confidence: 80%

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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“…These measures aim to improve the strength and stability of soft clays and reduce their settlement potential. Further research could explore the effectiveness of these measures in conjunction with the use of solidifying agents, such as OPC and DF, for stabilizing WDC [39].…”

Section: Effect Of Opc and Df Content On The Stabilization Of Wdcmentioning

confidence: 99%

Feasibility Study of Low-Environmental-Load Methods for Treating High-Water-Content Waste Dredged Clay (WDC)—A Case Study of WDC Treatment at Kumamoto Prefecture Ohkirihata Reservoir in Japan

Zhang

Omine

et al. 2023

Sustainability

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The effective and sustainable treatment of high-water-content waste dredged clay (WDC) remains a significant challenge in water conservancy engineering. In this study, we focused on the treatment of WDC produced by Kumamoto Ohkirihata Reservoir. The study examined the effect of two types of cement-based solidifiers, namely, ordinary Portland cement (OPC) and cement–fly ash agent (DF), on three clay samples collected from different locations. The cone index test was used to assess the samples’ properties. The dosage of cement required for effective improvement with DF was significantly reduced (by about 47–55%), compared to OPC. Moreover, the dewatering efficiency of WDC improved by the simple dewatering method of vertically placing environmental protection materials. Within seven days, the average water content of the WDC decreased to below the liquid limit compared with natural air drying. Finally, the dosage of DF required to stabilize the WDC under effective improvement conditions was reduced by 37–58%, which is higher than the dosage of OPC reduction (22–50%). The reduction in water content reduced the pore space of the soil particles, benefiting the internal bonding of DF-stabilized clay. Dewatering methods facilitate the use of DF solidifiers, facilitating sustainable and environmentally friendly improvement in WDC.

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“…Locally available soils may not always satisfy the liner design specifications. The presence of vulnerable soils as in situ soils poses a threat to the structural integrity and serviceability of the intended application 8 . However, the amendment of soils using appropriate materials will render them effective barriers 9 .…”

Section: Introductionmentioning

confidence: 99%

Target reliability-based design optimization studies on cohesive soil amended with chitosan and casein for liner applications

Rasheed,

Moghal,

Basha

et al. 2024

Sci Rep

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The current study investigated the primary and secondary compressibility characteristics of organic clay with two biopolymers, Chitosan (Dch) and Casein (Dca) at dosages of 0.5%, 1%, 2%, and 4%. The primary compression index (Cc) values were reduced by 18% and 59% at dosage (Dch and Dca) of 4% at a consolidation pressure of 800 kPa. The secondary compression indices of chitosan and casein-treated soils fell below the normal range specified for organic soils and lay in the range of 0.01–0.017. The biopolymers also accelerated the consolidation process at all dosages (Dch) and 2% Dca. The hydraulic conductivity increased for all dosages of chitosan whereas it declined for all dosages of casein compared to untreated soil. The reliability analysis was conducted for biopolymer-treated soils and presented a rational approach toward the selection of a suitable liner. Chitosan failed to achieve a target reliability index of 3 whereas casein-amended samples attained values equal to and greater than 3 at all dosages and consolidation pressures at COV of Kmax = 20%. At all dosages, the casein-treated soils exhibited reliability index values greater than 3 up to COV of Kmax = 40% indicating the higher stability of casein mixes as a liner material.

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Critical appraisal of the behavioral geo-mechanisms of peats/organic soils

Cited by 10 publications

References 116 publications

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

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

Feasibility Study of Low-Environmental-Load Methods for Treating High-Water-Content Waste Dredged Clay (WDC)—A Case Study of WDC Treatment at Kumamoto Prefecture Ohkirihata Reservoir in Japan

Target reliability-based design optimization studies on cohesive soil amended with chitosan and casein for liner applications

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