Evaluating the physical characteristics of biopolymer/soil mixtures

Ayeldeen, Mohamed; Negm, Abdelazim; Sawwaf, Mostafa A. El

doi:10.1007/s12517-016-2366-1

Cited by 167 publications

(52 citation statements)

References 24 publications

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“…Therefore, relatively weaker specimens were prepared. The findings are in agreement with previous research [11,25,27,28]. Chang et al [25] investigated the effect of XG on the UCS of sand, sand with silt and high plasticity clay.…”

Section: Unconfined Compression Testsupporting

confidence: 91%

Study on Shear Strength of Xanthan Gum-Amended Soil

Soldo

Miletić

2019

Sustainability

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When construction work is planned on soil with inadequate shear strength, its engineering properties need to be improved. Chemical stabilization is one of the solutions for soil strength improvement. Currently, the most common additive that is used for chemical soil improvement is cement. Cement is an effective solution, but it has several negative effects on the environment. Therefore, the urges for environment-friendly solutions that can replace cement and show good potential for sustainable engineering are rising. One of the promising environment-friendly solutions is the use of biopolymers. Therefore, the main aim of the present study was to investigate the effect of the biopolymer xanthan gum on the strength of different types of soil. Xanthan gum was mixed with three different types of soil: sand, clay, and silty sand. The strength of treated and non-treated soil was experimentally investigated by performing unconfined compression, direct shear, and triaxial tests. From the results, it was observed that xanthan gum significantly increased the strength of each soil, which shows its major potential for the future of sustainable engineering.

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Section: Unconfined Compression Testsupporting

confidence: 91%

Study on Shear Strength of Xanthan Gum-Amended Soil

Soldo

Miletić

2019

Sustainability

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“…Investigation at higher concentrations of BG is needed to provide an estimate for the optimum BG concentration. However, XG, GG, and BG showed promising results for soil stabilization and provided enormous potential for future sustainable engineering 49,50 .…”

Section: Resultsmentioning

confidence: 99%

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

Soldo

Miletić

Auad

2020

Sci Rep

150

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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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“…Gel-type xanthan gum biopolymer is one example of a biopolymer that shows strong potential for practical implementation due to its sufficient strengthening (Ayeldeen et al 2016, Chang et al 2015a, Nugent et al 2009 and good economic feasibility based on mass commercialization (Casas et al 2000, Chang et al 2015b. In this study, the geotechnical engineering shear behavior of xanthan gum-treated sand is evaluated via laboratory direct shear testing.…”

Section: Introductionmentioning

confidence: 98%

“…Thus, the development of environmentally friendly, geotechnical construction material is necessary with respect to sustainable geotechnical engineering (Chang et al 2016b(Chang et al , 2015d. Recently, microbial biopolymers (high molecular polysaccharides produced by microbes) have been introduced and trialed as new geotechnical engineering binders to reduce the usage of conventional binders (Ayeldeen et al 2016, Chang et al 2016b. Biopolymer treatment shows a higher strengthening efficiency and performance than concurrent microbial precipitation methods such as MICP (microbial induced calcite precipitation) (Cole et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Geotechnical shear behavior of Xanthan Gum biopolymer treated sand from direct shear testing

Lee¹,

Chang²,

Chung³

et al. 2017

Geomech. Eng.

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Conventional geotechnical engineering soil binders such as ordinary cement or lime have environmental issues in terms of sustainable development. Thus, environmentally friendly materials have attracted considerable interest in modern geotechnical engineering. Microbial biopolymers are being actively developed in order to improve geotechnical engineering properties such as aggregate stability, strength, and hydraulic conductivity of various soil types. This study evaluates the geotechnical engineering shear behavior of sand treated with xanthan gum biopolymer through laboratory direct shear testing. Xanthan gum-sand mixtures with various xanthan gum content (percent to the mass of sand) and gel phases (initial, dried, and re-submerged) were considered. Xanthan gum content of 1.0% sufficiently improves the inter-particle cohesion of cohesionless sands 3.8 times and more (up to 14 times for dried state) than in the untreated (natural) condition, regardless of the xanthan gum gel condition. In general, the strength of xanthan gum-treated sand shows dependency with the rheology and phase of xanthan gum gels in inter-granular pores, which decreases in order as dried (biofilm state), initial (uniform hydrogel), and re-submerged (swollen hydrogel after drying) states. As xanthan gum hydrogels are pseudo-plastic, both inter-particle friction angle and cohesion of xanthan gum-treated sand decrease with water adsorbed swelling at large strain levels. However, for 2% xanthan gum-treated sands, the re-submerged state shows a higher strength than the initial state due to the gradual and non-uniform swelling behavior of highly concentrated biofilms.

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Evaluating the physical characteristics of biopolymer/soil mixtures

Cited by 167 publications

References 24 publications

Study on Shear Strength of Xanthan Gum-Amended Soil

Study on Shear Strength of Xanthan Gum-Amended Soil

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

Geotechnical shear behavior of Xanthan Gum biopolymer treated sand from direct shear testing

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