Study on Shear Strength of Xanthan Gum-Amended Soil

Soldo, Antonio; Miletić, Marta

doi:10.3390/su11216142

Cited by 40 publications

(33 citation statements)

References 22 publications

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“…These findings are consistent with previous research studies of biopolymer-treated soil under triaxial loading conditions showing that biopolymers can increase the peak deviatoric stress 40,[42][43][44][45][46] . On the other hand, Karimi 47 showed that the maximum deviatoric stress of 1% XG-treated silt can decrease in the period between five and 30 days.…”

Section: Resultssupporting

confidence: 93%

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Biopolymers as a sustainable solution for the enhancement of soil mechanical properties

Soldo

Miletić

Auad

2020

Sci Rep

Self Cite

168

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improving soil engineering properties is an inevitable process before construction on soft soil. increasing soil strength with chemical stabilizing agents, such as cement, raises environmental concerns. therefore, sustainable solutions are in high demand. one of the promising solutions is the usage of biopolymers. Five biopolymer types were investigated in this study: Xanthan Gum, Beta 1,3/1,6 Glucan, Guar Gum, Chitosan, and Alginate. Their effect on the soil strength improvement was experimentally investigated by performing unconfined compression, splitting tensile, triaxial, and direct shear tests. All tests were performed with different biopolymer concentrations and curing periods. Additionally, in order to have an insight on the susceptibility to natural elements, plain soil, and biopolymertreated specimens were exposed to real atmospheric conditions. The extensive experimental results showed that the soil strength tends to increase with the increase of biopolymer concentration and with the curing time. However, it was shown that the soil strength does not considerably change after a certain biopolymer concentration level and curing time. furthermore, it has been observed that the biopolymer-treated specimens showed better resistance to the influence of the environmental conditions. In general, Xanthan Gum, Guar Gum, and Beta 1,3/1,6 Glucan showed the most dominant effect and potential for the future of sustainable engineering.

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Section: Resultssupporting

confidence: 93%

“…Fig. 11a shows the interaction of an XG biopolymer and pure sand from the author's previous studies 46 . The formation of XG can clearly be seen as a coating agent surrounding coarse-grained particles and bridging the particles that are not in direct contact.…”

Section: Direct Shear Testmentioning

confidence: 99%

Biopolymers as a sustainable solution for the enhancement of soil mechanical properties

Soldo

Miletić

Auad

2020

Sci Rep

Self Cite

168

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“…This was due to an increase in the interfacial cohesion. This may be due to the formation of a biofilm between the clay particles and the geotextile surface which caused them to adhere together more tightly [55,56]. The enhanced interfacial shear strengths of the treated samples were due to the increased interfacial cohesions and interfacial friction angles.…”

Section: The Interfacial Direct Shear Testsmentioning

confidence: 99%

A Bioinspired Technique for Improving the Interaction Between Cohesive Soil and Geotextile Reinforcements

Mohammadi

Habibagahi

Hataf

2021

Int. J. of Geosynth. and Ground Eng.

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Reinforced soil structures often cannot perform properly when there is a weak interface which is not capable of mobilizing the required shear strength between fine-grained soils and the reinforcing elements. The calcium carbonate precipitation (CCP) technique adopted in this research has proved to be extremely useful in removing this deficiency. In this study, plantderived urease-induced calcium carbonate precipitation (PDUICCP) was used as a novel method to improve the performance of the interface. Instead of using commercial-grade purified urease, the extract of soybean seeds was mixed with calcium chloride and urea to prepare a precipitating solution to reduce the costs. In addition, xanthan gum was used as a benchmark to examine the efficiency of the calcium carbonate precipitation process. Modified direct shear tests were performed on the kaolin clay specimens with two different relative compactions, three concentrations of the precipitating solution, and three different geotextiles to assess the performance of the proposed method. The results revealed that the application of the proposed method improved the interfacial shear strength considerably with the interface efficiency increasing from 12 to 270% depending on the geotextile texture and roughness, the relative soil compaction, and the concentration of the precipitation solutions. The highest increase in the interfacial shear strength for all the concentrations of the precipitating solutions was obtained when the polypropylene nonwoven geotextile was used. In all the cases, increasing the relative soil compaction enhanced the interfacial shear strength and interface efficiency. The optimal concentration of the constituents in the precipitating solution was obtained when 0.64 molar (M) calcium chloride and 1 M urea were used. The results of this study can mark the beginning of a new type of geosynthetics with multiphase strength parameters after the addition of environmentally friendly materials. Moreover, they pave the way for using fine-grained soils as the bulk backfill material in reinforced soil structures where coarse-grained soil is not readily available.

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“…A summary of recent studies on biopolymer-treated soil is presented in Table 2. Biopolymer content [116][117][118] Dehydration time [116][117][118][119] Durability [117,119] Direct Shear Dehydration time [117,119] Splitting Tensile Biopolymer content [117] Compaction Biopolymer content [116] Consistency limits Biopolymer content [116] Permeability Dehydration time [119] Sand Unconfined compressive strength…”

Section: Biopolymer-clay Interactionmentioning

confidence: 99%

Biopolymers as Green Binders for Soil Improvement in Geotechnical Applications: A Review

et al. 2021

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Soil improvement using biopolymers has attracted considerable attention in recent years, with the aim to reduce the harmful environmental effects of traditional materials, such as cement. This paper aims to provide a review on the environmental assessment of using biopolymers as binders in soil improvement, biopolymer-treated soil characteristics, as well as the most important factors affecting the behavior of the treated soil. In more detail, environmental benefits and concerns about the use of biopolymers in soil improvement as well as biopolymer–soil interaction are discussed. Various geotechnical properties are evaluated and compared, including the unconfined compressive strength, shear strength, erosion resistance, physical properties, and durability of biopolymer-treated soils. The influential factors and soil and environmental conditions affecting various geotechnical characteristics of biopolymer-treated soils are also discussed. These factors include biopolymer concentration in the biopolymer–soil mixture, moisture condition, temperature, and dehydration time. Potential opportunities for biopolymers in geotechnical engineering and the challenges are also presented.

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Study on Shear Strength of Xanthan Gum-Amended Soil

Cited by 40 publications

References 22 publications

Biopolymers as a sustainable solution for the enhancement of soil mechanical properties

Biopolymers as a sustainable solution for the enhancement of soil mechanical properties

A Bioinspired Technique for Improving the Interaction Between Cohesive Soil and Geotextile Reinforcements

Biopolymers as Green Binders for Soil Improvement in Geotechnical Applications: A Review

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