Experimental investigation of sandy soil stabilization using chitosan biopolymer

Transportation Geotechnics, Год журнала: 2024, Номер 46, С. 101266 - 101266

Опубликована: Май 1, 2024

The performance of an environmentally friendly biopolymer synthesised from secondary resources to overcome the wind erosion sandy soil was investigated in this study. study employed a multi-scale approach investigate mechanical, erosional, and hydraulic properties soil. At macroscale, experimental techniques such as unconfined triaxial compression tests, permeability measurements, contact angle assessments, tunnel experiments were utilized characterize bulk behavior Concurrently, molecular dynamics (MD) simulations conducted at nanoscale predict surface mechanical characteristics elucidate chemical interactions level. Results show that when outer particles is coated with sparse concentration biopolymer, aerosol inhibitory significant even under extreme storm conditions reaching speeds 140 km/h storms. on impact content, curing time, revealed addition chitosan has ability enhance bonding between significantly atomic insight reveals huge entanglement by Van der Waals interaction. results Unconfined Compressive Strength test indicate enhances compressive strength sand up 320 kPa. Additionally, demonstrated application led 34.2 kPa improvement cohesion sand. Furthermore, analysis decrease conductivity coefficient 1.6 × 10^-6 m/s 5.7 10^-7 m/s, representing reduction approximately 35 %.

Язык: Английский

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Effect of Chitosan and Casein on the CBR behavior of silty clay for low volume roads: Reliability-based design optimization approach

Construction and Building Materials, Год журнала: 2025, Номер 473, С. 141014 - 141014

Опубликована: Март 31, 2025

Язык: Английский

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Mechanical behavior and strengthening mechanism of loess stabilized with xanthan gum and guar gum biopolymers

Materials Research Express, Год журнала: 2024, Номер 11(10), С. 105305 - 105305

Опубликована: Окт. 1, 2024

Abstract The structural properties of loess are susceptible to change when subjected external loads and complex environments, leading various geological disasters. To investigate the mechanical behavior strengthening mechanism stabilized with biopolymers such as xanthan gum guar gum, especially for soils low bearing capacity stability in engineering applications, we conducted research on improvement soil tests including unconfined compressive strength, disintegration, direct shear, microstructure were conducted. Among four different dosages (0%, 0.5%, 1%, 2%) curing ages (1 day, 3 days, 7 14 days), 2% content biopolymer days had greatest impact loess, Both shear well water solidified improve higher or prolonged time; however, disintegration rate decreases. Microscopic analysis indicates that effectively fill gaps between particles attach particle surfaces, forming fibrous reticular structures interparticle bonding ultimately increase strength loess. Xanthan can enhance erosion resistance water-holding capacity. These outcomes suggest have potential serve environmentally sustainable alternatives conventional stabilizers.

Язык: Английский

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Efficacy of Acacia Gum Biopolymer in Strength Improvement of Silty and Clay Soils under Varying Curing Conditions

Polymers, Год журнала: 2024, Номер 16(19), С. 2831 - 2831

Опубликована: Окт. 7, 2024

Acacia gum (AG), a polysaccharide biopolymer, has been adopted to improve the strength of three cohesive soils by subjecting them diverse environmental aging conditions. Being and potentially sustainable construction material, AG yielded flexible film-like threads after 48 h upon hydration, its pH value 4.9 varied marginally with stabilized soils. The soil samples for geotechnical evaluation were subjected wet mixing tested under their Optimum Moisture Content (OMC), as determined light compaction method. addition modified consistency indices due presence hydroxyl groups in AG, which also led rise OMC reduction Maximum Dry Unit weight (MDU). Unconfined Compressive Strength (UCS) California Bearing Ratio (CBR) thermal curing at 333 K well on same day sample preparation. least performing condition soil’s CBR was evaluated submerged conditions allowing AG-stabilized specimens air-cure period 1 week. UCS 7 days initial K. A dosage 1.5% 2530 kN/m2 98.3%, respectively, low compressible clay (LCC) temperature viscosity found be 214.7 cP 2% dosage. Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), average particle size determination revealed filling pores gel solution, adsorption, hydrogen bonding, improvements macroproperties.

Язык: Английский

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Multiscale investigation into the hydrogel-stabilized river bank sand: Sight from NMR and CT technology

Construction and Building Materials, Год журнала: 2025, Номер 460, С. 139900 - 139900

Опубликована: Янв. 1, 2025

Язык: Английский

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Assessing shear strength degradation of gravel-bearing soil from Northeast Forest Region, China, under freeze–thaw action

Bulletin of Engineering Geology and the Environment, Год журнала: 2025, Номер 84(5)

Опубликована: Апрель 17, 2025

Язык: Английский

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Artemisia sphaerocephala krasch gum-modified broken sandstone oriented towards open-pit-mine dump remodeling: Insights into mechanical properties and microscale mechanisms

Colloids and Surfaces A Physicochemical and Engineering Aspects, Год журнала: 2025, Номер unknown, С. 137053 - 137053

Опубликована: Апрель 1, 2025

Язык: Английский

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Mechanical Properties and Microscopic Mechanism of Granite Residual Soil Stabilized with Biopolymers

Applied Sciences, Год журнала: 2025, Номер 15(10), С. 5223 - 5223

Опубликована: Май 8, 2025

Granite residual soil exhibits a tendency to collapse and disintegrate upon exposure water, displaying highly unstable mechanical properties. This makes it susceptible landslides, mudslides, other geological hazards. In this study, three common biopolymers, i.e., xanthan gum (XG), locust bean (LBG), guar (GG), are employed improve the strength stability of granite soil. A series experiments were conducted on biopolymer-modified soil, varying types their concentrations, curing times, examine effects soil’s properties failure characteristics. The microscopic structure interaction mechanisms between biopolymers analyzed using scanning electron microscopy X-ray diffraction. results indicate that gum-treated exhibited highest unconfined compressive shear strength. After adding 2.0% gum, modified 1.6 times 1.58 untreated respectively. Optimal improvements observed when biopolymer concentration ranged from 1.5% 2%, with time 14 days. treatment cohesion is 1.36 1.34 1.55 enhanced bonding through cross-linking, thereby improving gel-like substances formed by reaction water adhered encapsulated particles, significantly altering deformation behavior, toughness, modes. Furthermore, interactions minerals functional groups contributed further enhancement study demonstrates feasibility offering theoretical insights into underlying govern improvement.

Язык: Английский

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Recycling of Industrial Waste as Soil Binding Additives—Effects on Soil Mechanical and Hydraulic Properties during Its Stabilisation before Road Construction

Materials, Год журнала: 2024, Номер 17(9), С. 2000 - 2000

Опубликована: Апрель 25, 2024

To improve the in situ soil stabilization, different chemical additives are used (ion exchange compounds, based on H2SO4 or vinyl polymers, and organic using lignosulfonates). One interesting alternative is production of from various waste materials. The extensive testing waste-based blends with was performed; mechanical (unconfined compressive strength (UCS)) hydraulic (capillary rise, water absorption, frost resistance (FR)) properties were measured. optimization process led to obtaining additive compositions ensuring high sealing properties: by-pass ash ceramics industry, H2SO4, pyrolytic waxes/oils mixed plastics, tires HDPE, emulsion chewing gum waste. For sandy soil, following most promising: wax (EPW) PE foil (WPEF) addition pyrolytic-oil tires, EPW plastics “by-pass” NaOH, WPEF reaching up 93% FR, a 79.6% 7-day UCS increase, 27.6% 28-day increase. clay: solely 7.5% an 80.7% 119.1%

Язык: Английский

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AHFO-based soil water content sensing technology considering soil–sensor thermal contact resistance

Journal of Rock Mechanics and Geotechnical Engineering, Год журнала: 2024, Номер 16(7), С. 2715 - 2731

Опубликована: Май 30, 2024

The actively heated fiber-optic (AHFO) technology has become emerged as a research focus due to its advantages of distributed, real-time measurement and good durability. These attributes have led the gradual application AHFO water content in situ soil. However, all existing applications fail consider effect soil–sensor contact quality on measurements, limiting potential for wider technology. To address this issue, authors propose method determining thermal resistance based principle an infinite cylindrical heat source. This is then used establish that considers resistance. reliability validity new are explored through laboratory test field case study, spatial-temporal evolution soil revealed. results demonstrate highly effective applicable types soils. requires only moisture content, dry density, response be obtained. In case, error between method, which takes into account resistance, neutron scattering 0.011. exhibits seasonal variation, with increase spring autumn decrease summer winter. Furthermore, shallow soils precipitation evaporation significant. findings contribute enhancement accuracy soils, thereby facilitating dissemination utilization

Язык: Английский

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