The influence of fines on the hydro-mechanical behavior of sand for sustainable compacted liner and sub-base construction applications

Onyelowe, Kennedy C.; Ebid, Ahmed M.; Hanandeh, Shadi; Moghal, Arif Ali Baig; Onuoha, Ifeanyichukwu C.; Obianyo, Ifeyinwa Ijeoma; Stephen, Leslie; Ubachukwu, Obiekwe A.

doi:10.1007/s42107-023-00800-4

Cited by 14 publications

(3 citation statements)

References 47 publications

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“…Due to the non-availability of low permeable soils, soil amendment becomes imperative for achieving the desired properties of a liner. The performance of a liner requires the assessment of the hydro-mechanical behavior of a material [80]. The current study evaluated the efficacy of a polysaccharide biopolymer named chitosan in addressing the compressibility and desiccation cracking of amended clayey soil.…”

Section: Recommended Application From the Resultsmentioning

confidence: 99%

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: Recommended Application From the Resultsmentioning

confidence: 99%

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

Rasheed,

Moghal,

Jannepally

et al. 2023

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“…As PFC2D itself has no concept of water, to simulate WCS with different water contents, based on the uniaxial compression data for WCS with different water contents in the laboratory, the equivalent substitution method was adopted. It was considered that the strength and failure characteristics of the numerical model were in good agreement with the laboratory test, enabling the characterization of WCS with different water contents [15]. The fine-scale parameters were verified to ensure that the proposed particle flow model could be used to simulate the uniaxial cyclic loading and unloading of WCS.…”

Section: Verification Of the Fine-view Parametersmentioning

confidence: 95%

Cyclic Loading and Unloading of Weakly Consolidated Sandstone with Various Water Contents

Long,

Sun,

Cai

et al. 2023

Sustainability

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Weakly cemented rocks have a loose structure, poor mechanical properties, and soften and disintegrate upon contact with water. Mining operations cause damage and ruptures to rocks under cyclic loading and unloading, leading to serious disasters. This study investigated the effects of cyclic loading and unloading on the mechanical properties of weakly cemented sandstone (WCS) with various water contents (0–7.72%). A numerical model based on the particle flow theory simulated the behavior of WCS particles. The stress–strain relationships, damage and rupture patterns, energy evolution, and damage properties of WCS were examined using loading–unloading simulations. Water negatively affected the strength and elastic modulus of WCS. High water contents (>2.31%) increased the rupture probability and affected the rupture modes. Ruptures mainly occurred via the main fissure and caused cleavage damage; however, instances of tensile damage and shear slippage increased with an increasing water content. The elastic, dissipation, and total energies gradually increased with increasing cyclic loading and unloading. The damage factors of WCS with different water contents gradually increased with the growth rate. The mechanical properties of the sandstone were deteriorated by water, which increased the peak value of the damage factor from 0.77 for 0% moisture to 0.81 for 7.72% moisture.

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“…Soils treated with calcium-based derivatives and granite dust resulted in the reduction of the pore volume and in the enhancement of tensile strength [12]. Non-availability of cohesive soils has moved the focus to the enrichment of sandy soils to meet the requirements of liner and subbase [13]. Enhancement in soil qualities, including water retention, pollutant mitigation, and shear strength, has been accomplished using bio-geo-engineering techniques such as EICP and MICP.…”

Section: Introductionmentioning

confidence: 99%

Embodied Energy in the Production of Guar and Xanthan Biopolymers and Their Cross-Linking Effect in Enhancing the Geotechnical Properties of Cohesive Soil

Kumar,

Moghal,

Vydehi

et al. 2023

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Traditional soil stabilization techniques, such as cement and lime, are known for their menacing effect on the environment through heavy carbon emissions. Sustainable soil stabilization methods are grabbing attention, and the utilization of biopolymers is surely one among them. Recent studies proved the efficiency of biopolymers in enhancing the geotechnical properties to meet the requirements of the construction industry. The suitability of biopolymer application in different soils is still unexplored, and the carbon footprint analysis (CFA) of biopolymers is crucial in promoting the biopolymers as a promising sustainable soil stabilization method. This study attempts to investigate the out-turn of cross-linked biopolymer on soils exhibiting different plasticity characteristics (Medium & High compressibility) and to determine the Embodied carbon factor (ECF) for the selected biopolymers. Guar (G) and Xanthan (X) biopolymers were cross-linked at different proportions to enhance the geotechnical properties of soils. Atterberg’s limits, Compaction characteristics, and Unconfined Compressive Strength were chosen as performance indicators, and their values were analyzed at different combinations of biopolymers before and after cross-linking. The test results have shown that Atterberg’s limits of the soils increased with the addition of biopolymers, and it is attributed to the formation of hydrogels in the soil matrix. Compaction test results reveal that the Optimum Moisture Content (OMC) of biopolymer-modified soil increased, and Maximum Dry Density (MDD) reduced due to the resistance offered by hydrogel against compaction effort. Soils amended with biopolymers and cured for 14, 28, and 60 days have shown an appreciable improvement in Unconfined Compressive Strength (UCS) results. Microlevel analysis was carried out using SEM (Scanning Electron Microscopy) and FTIR (Fourier-transform infrared spectroscopy) to formulate the mechanism responsible for the alteration in targeted performance indicators due to the cross-linking of biopolymers in the soil. The embodied energy in the production of both Guar and Xanthan biopolymers was calculated, and the obtained ECF values were 0.087 and 1.67, respectively.

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The influence of fines on the hydro-mechanical behavior of sand for sustainable compacted liner and sub-base construction applications

Cited by 14 publications

References 47 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

Cyclic Loading and Unloading of Weakly Consolidated Sandstone with Various Water Contents

Embodied Energy in the Production of Guar and Xanthan Biopolymers and Their Cross-Linking Effect in Enhancing the Geotechnical Properties of Cohesive Soil

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