Estimation of wetting hydraulic conductivity function for unsaturated sandy soil

Zhai, Qian; Rahardjo, Harianto; Satyanaga, Alfrendo; Zhu, Yiyao; Dai, Guoliang; Zhao, Xinlei

doi:10.1016/j.enggeo.2021.106034

Cited by 57 publications

(21 citation statements)

References 29 publications

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“…Uyar et al, synthesized alginate-montmorillonite composite beads for sequestration of methylene blue (MB) dye from wastewater and found that adsorption of MB was directed the monolayer physical mechanism with thermodynamically spontaneous and endothermic nature at beat 40 °C. [66] Freezing the beads enhance the adsorption capacity due to the enlarged surface area of material gained through this process without destruction of bead veracity. [67] The sodium alginate has an abundant presence of functional groups including the carboxyl group and hydroxyl group and their backbone chain can be fabricated to enhance their properties through esterification, chemical crosslinking, and etherification.…”

Section: Raed H Althomali Has Got a Phd Degree From King Abdulaziz Un...mentioning

confidence: 99%

“…98 % of Cr(VI) ions removal at solution pH 4.0 using modified bionano composite and material considered as a promising adsorbent for wastewater purification with regeneration capacity. [65][66] It has been suggested that the chitosan-based eco-friendly biopolymers materials were found to be biodegradable and non-toxic materials for metal adsorption. Among biomaterials, alginates have been explored as good candidates [55] for modification and polymerization of bio-nano composite for separation sciences especially wastewater purification techniques including the adsorption process.…”

Section: Raed H Althomali Has Got a Phd Degree From King Abdulaziz Un...mentioning

confidence: 99%

“…In another study conducted by Sethy and Sahoo was developed the novel chitosan‐grafting‐poly(methyl methacrylate (PMMA)/silica bio nanocomposite (BNC) as an extraordinary, low cost and eco‐friendly biopolymer and applied for highly toxic Cr(VI) adsorption from contaminated solution. 98 % of Cr(VI) ions removal at solution pH 4.0 using modified bio‐nano composite and material considered as a promising adsorbent for wastewater purification with regeneration capacity [65–66] . It has been suggested that the chitosan‐based eco‐friendly biopolymers materials were found to be biodegradable and non‐toxic materials for metal adsorption.…”

Section: Bio‐nanocomposite For Wastewater Treatmentmentioning

confidence: 99%

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Versatile Applications Of Biopolymer Nanocomposites: A review

et al. 2022

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Biopolymers having biodegradable and biocompatible characteristics have been gained a great interest of scientists for using various applications in the field of advanced sciences exclusively with nanotechnology of separation and purification field. Different exciting applications have been found in the versatile field including energy production, wastewater treatment, sensor development, food packaging and broadly in the biomedical sciences. Biopolymer can be applied to increase the capabilities of other bio‐active molecules in a material. Now dyes, scientists are concentrated for preparing more environment friendly nanomaterials and increasing attention for immobilizing of contaminates and adoption by using green chemistry approaches. This review has been summarized the vital applications of biopolymer and highlighted with their owned advantages and limitations of numerous field by reported studies. The possible mechanistic insights of diverse applications of biopolymers were discussed. This review has been finds the efficiencies of biopolymers in the major field of sciences and were considered as the outstanding materials due to their exciting physic‐chemical properties and other characteristics include eco‐friendly nature, low cost, nontoxic, high adsorption capacity and reusability. This review could be considered as a precious pathway for exploring more low‐cost, environmental friendly hybrid materials for versatile applications including water decontamination, sensing of targeted elements and other biomedical purposes, eventually the review will contribute to environmental remediation and purification applications of biomaterials.

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Section: Raed H Althomali Has Got a Phd Degree From King Abdulaziz Un...mentioning

confidence: 99%

Section: Raed H Althomali Has Got a Phd Degree From King Abdulaziz Un...mentioning

confidence: 99%

Section: Bio‐nanocomposite For Wastewater Treatmentmentioning

confidence: 99%

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Versatile Applications Of Biopolymer Nanocomposites: A review

et al. 2022

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“…Albright and Benson (2002) labelled this kind of upper bound and lower bound curve as a wetting and drying curve of SWCC [33]. Zhai et al, (2020Zhai et al, ( , 2021 determined the wetting hydraulic conductivity for unsaturated sandy soil in their study, in which they discussed the hysteresis phenomenon [34,35]. Hedayati et al, (2020) also discussed one method for observing the hysteresis effect using field data [36].…”

Section: Limitations Of the Studymentioning

confidence: 99%

Field Determination of Unsaturated Permeability and Flow Properties through Subgrade Instrumentation

Ahmed

Hossain

2022

Geosciences

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Due to the representation of a particular field condition of soil rather than the real time scenario from laboratory experiments, the selection of unsaturated permeability and flow parameters becomes challenging when conducting numerical modeling. Keeping this in mind, the objective of the study was to determine the permeability in both directions along with the unsaturated flow parameters from field data. Although it is conventional to determine the flow parameters from the curve fitting of laboratory results, a novel approach was carried out during the course of study, wherein field soil water characteristic curves were used to determine the unsaturated flow parameters. Two two-lane roads in Kaufman County and Ellis County, Texas were selected for data acquisition and monitoring in this study. For the investigation of in situ moisture content and matric suction, soil moisture and suction sensors were installed at up to a depth of 4.5 m into the ground, while the precipitation was recorded using rain gauges installed at the sites. Field determination yielded hydraulic conductivity values in the range of 10−4 to 10−5 m/s, representing the rapid flow of water due to desiccation cracks on expansive soil. Field-generated unsaturated flow parameters also indicated variability while constructing the SWCC. Finally, PLAXIS 2D was used for the transient flow analysis. The close agreement of the FE results with the direct field measurements validated the estimated flow parameters. The approach described in the study can be used for determining permeability and unsaturated flow parameter values from field data, which offers a dynamic situation in contrast to the static laboratory condition.

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“…The clay content is 0, 3%, 6%, 9%, 12%, 15%, 18% and 21%, respectively. It should be noted that the change of the clay content not only changes the water content but also the unsaturated behavior of soil samples [ 25 , 26 ]. However, the present work mainly focuses on the influence of clay content on the solidification effect of MICP treated sand, and as soil samples with different clay content undergo MICP grouting procedure, which inevitably causes changes to the water content and unsaturated behavior of soil samples, therefore, the unsaturated was not considered.…”

Section: Test Materials and Schemesmentioning

confidence: 99%

The Effect of Clay on the Shear Strength of Microbially Cured Sand Particles

Dong

Gao

2022

Materials

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Microbial solidification of sand has obvious effects: energy-saving and environmental protection. It is a green and sustainable soil consolidation technology with low energy consumption, which meets the needs of high-quality development of modern economy and society. However, when clay is doped in sand, clay has an uncertain influence on the effectiveness of the microbial solidification of sand. Therefore, triaxial consolidation undrained tests before and after microbial solidification of sands with different clay content are carried out in this paper. The effects of clay content on the solidification effect of sands are compared and analyzed. The variation laws of shear strength, unconfined compressive strength, internal friction angle and the cohesion of sands with different clay content before and after microbial solidification are discussed. The failure modes of sand samples were studied and the influence mechanism of clay on the microbial solidification of sand was revealed from a micro perspective. The test results show that the failure strain and unconfined compressive strength of microbial-induced calcium carbonate precipitation (MICP) treated samples increase first and then decrease with the increase in the clay content. The unconfined compressive strength is the highest when the clay content is 9%, and the samples with low clay content (3~9%) can still retain good integrity after being destroyed. As the content of clay in the sand–clay mixture increases, the internal friction angle of the sample decreases and the cohesion increases. After MICP treatment, the internal friction angle and cohesion of the sand increase first and then decrease with the increase in clay content. There are three main contact modes between sand-clay-CaCO3. When clay content is low, clay plays a filling role. The contact mode between sand-clay and CaCO3 is mainly between sand particles and calcium carbonate and between clay particles and calcium carbonate. When clay content is high, the contact mode between particles is mainly between clay particles and calcium carbonate. Higher clay content wraps sand particles, prevents contact between calcium carbonate and sand particles and reduces the strength of sand.

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Estimation of wetting hydraulic conductivity function for unsaturated sandy soil

Cited by 57 publications

References 29 publications

Versatile Applications Of Biopolymer Nanocomposites: A review

Versatile Applications Of Biopolymer Nanocomposites: A review

Field Determination of Unsaturated Permeability and Flow Properties through Subgrade Instrumentation

The Effect of Clay on the Shear Strength of Microbially Cured Sand Particles

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