Strength and durability characteristics of biopolymer-treated desert sand

Qureshi, Mohsin Usman; Chang, Ilhan; Al-Sadarani, Khaloud

doi:10.12989/gae.2017.12.5.785

Cited by 97 publications

(49 citation statements)

References 35 publications

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“…According to Okwadha and Li [43] high bacteria cell concentration in the soil would obviously increase the amount of calcite precipitated from the urea hydrolysis process. Therefore, the rate of urea hydrolysis has a direct relationship to the bacterial cell concentration, provided sufficient reactant concentrations are available [44,45]. High bacterial concentrations produce more urease per unit volume to induce urea hydrolysis.…”

Section: Bacteria Cell Concentrationmentioning

confidence: 99%

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

2018

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Recently, the concept of using biological process in soil improvement otherwise called bio-mediated soil improvement technique has shown greater prospects in the mitigation of liquefiable soils. It is an environmental friendly technique that has generated great interest to geotechnical engineers. This paper presents a review on the microorganism responsible for the biological processes in soil improvement system, factors that affect biological process, identifying the mechanism of liquefaction and commonly adopted method to mitigate liquefaction. Next, the effect of microbial induced calcite precipitation (MICP) on the strength and cyclic response were also analyzed, where it was identified that higher cementation level leads to formation of larger sized calcite crystals which in turn leads to the improved shear strength, stiffness and cyclic resistance ratio of the soil. However, the effects of various bacteria, cementation reagent concentrations amongst other factors were not fully explored in most of the studies. Finally, some of the challenges that lay ahead for the emerging technology are optimizing treatment factors (bacteria and cementation reagent concentration), upscaling process, training of researchers/technologist and long – time durability of the improved soils.

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Section: Bacteria Cell Concentrationmentioning

confidence: 99%

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

2018

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“…Xanthan gum is one of the most common biopolymers used in geotechnical engineering applications, such as soil stabilization (Chang et al 2015a;Im et al 2017;Latifi et al 2017;Lee et al 2017), mine tailings treatment (Chen et al 2015), erosion control (Qureshi et al 2017), adobe buildings (Chang et al 2015b;Dove et al 2016), and permeability control (Cabalar et al 2017;Martin et al 1996). However, most studies have focused on the macrobehavior of xanthan gum-treated soils without detailed consideration of the microscale soil-fluid interaction.…”

Section: Introductionmentioning

confidence: 99%

Soil consistency and interparticle characteristics of xanthan gum biopolymer–containing soils with pore-fluid variation

Chang

Kwon

et al. 2019

Can. Geotech. J.

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Biopolymer–soil technology is currently recognized as an environmentally friendly soil improvement method for geotechnical engineering practices. However, concerns exist regarding biopolymer fine-soil applications because the performance of biopolymers is based on an electrical interaction with clay or a pore fluid. Thus, the effect of water content and pore-fluid chemistry on biopolymer behavior in soil must first be clarified in terms of biopolymer applications. In this study, the liquid limits of xanthan gum biopolymer–treated clay–sand mixtures (clayey silt, kaolinite, montmorillonite, and sand) were obtained using three chemically distinct pore fluids (deionized water, 2 mol/L NaCl brine, and kerosene). Xanthan gum has contrary effects to the soil consistency, where the liquid limit can decrease via xanthan gum–induced particle aggregation or increase due to xanthan gum hydrogel formation. The clay-mineral type governed the xanthan gum behavior in the deionized water, while the pore-fluid chemistry governed the xanthan gum behavior in the brine and the kerosene.

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“…Desert sand is bio improved by using xanthan gum [3,10] and reinforced with date palm fibre. The Vane shear strength of naturally reinforced bio-improved sand is delineated by vane shear tests at various moisture levels.…”

Section: Methodsmentioning

confidence: 99%

“…Then the sample was transferred to the container for testing. The dry density of the samples was ranging from 1.3-1.5 g/cm 3 . The detailed record of samples is shown in Table 1.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In attempts to reduce or replace cement use in modern ground improvement practices, several alternatives such as geopolymers, alkali activated cement, geo-cement, and inorganic polymer concrete have been developed. However, recent attempts such as biological treatment of soils could attain the same engineering performance with less environmental concerns [3]. Biocementation shows potential to replace the energy intensive mechanical compaction processes or expensive and environmentally harmful chemical grouting [4].…”

Section: Introductionmentioning

confidence: 99%

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Vane shear strength of bio-improved sand reinforced with natural fibre

et al. 2019

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In the recent developments, bio-improvement has considerably enhanced the geotechnical properties and reduced degradation of loose desert sand without the environmental concerns. However, the effect of bio-improvement on sand weakens due to water submergence. Therefore, it is necessary to explore the techniques for retaining the strength of bio-improved sand in water submerged state. So, this paper reports the geotechnical performance of submerged bio-improved sand reinforced by discrete natural fibres. The desert sand sampled from Al-Sharqia Desert of Oman, bio-improved by xanthan gum and reinforced by discrete natural fibres obtained from date palm tree. Date palm fibres having a diameter less than 0.2mm and length 1cm were employed for sand reinforcement. Vane shear tests and standard compaction tests were performed on specimens having different mix ratios of sand-xanthan gum with and without natural fibres. The qualitative description of bio-improvement and fibre reinforcement effect on the desert sand is also presented as the photomicrographs taken by field emission scanning electron microscope. According to the results of strength tests at higher moisture content state, the discrete fibre reinforcement has enhanced the geotechnical performance of sand improved at lower concentrations.

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Strength and durability characteristics of biopolymer-treated desert sand

Cited by 97 publications

References 35 publications

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

Soil consistency and interparticle characteristics of xanthan gum biopolymer–containing soils with pore-fluid variation

Vane shear strength of bio-improved sand reinforced with natural fibre

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