Undrained Behavior of Microbially Induced Calcite Precipitated Sand with Polyvinyl Alcohol Fiber

Choi, Sun-Gyu; Hoang, Tung; Park, Sung-Sik

doi:10.3390/app9061214

Cited by 17 publications

(12 citation statements)

References 25 publications

(43 reference statements)

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“…The rate of expansion then drops as pronounced shear bands develop. In general, these results are typical of the behavior of artificially cemented specimens prepared with a range of cement types [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Figure 14 shows the response and changes of G max with p′ for typical gypsumcemented samples and comparison with the response for uncemented sand.…”

Section: Gypsum-cemented Sand Resultsmentioning

confidence: 85%

“…For example, clean Ottawa sand treated with microbes produced calcite in the range of 0-4%. During the treatment, the angle of friction increased from 35.3 to 39.6° and the cohesion from 0 to 93 kPa [25].…”

Section: Literature Reviewmentioning

confidence: 99%

“…As sands with similar gradings were used and samples were prepared to similar densities in both studies, the different responses point to the sample preparation method as Geomechanical Behavior of Bio-Cemented Sand for Foundation Works DOI: http://dx.doi.org/10.5772/intechopen.88159 being the key difference. Several studies [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] have shown that regardless of the injection process, obtaining uniform calcite precipitation is difficult, and it is also difficult to control, especially for small amounts of cement. The results from the mixing method of preparation show that this can lead to more homogenous cementation at low calcite contents and mixing can achieve calcite contents of nearly 10%.…”

Section: Unconfined Compressive Strength Testsmentioning

confidence: 99%

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Geomechanical Behavior of Bio-Cemented Sand for Foundation Works

Duraisamy¹,

Airey²

2020

Sandy Materials in Civil Engineering - Usage and Management

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Bio-cementation is an innovative green technology that complements existing ground improvement techniques, but it is yet to be proven for large-scale foundation works. Previously attention has been focused on strategies to inject the bacteria and nutrients to produce the cement in the ground. This study looks at the performance of geomechanical response when the bacteria and nutrients are mixed in sand, an approach that is used in producing cemented soil columns. To explore the mechanical response of bio-cemented soil, results from unconfined compressive strength (UCS) tests and triaxial tests have been analyzed to understand the effects of bio-cementation for sand in contrast to alternative cement, gypsum. The stiffness has also been monitored using bender element techniques in triaxial cell. Both the shear wave signals during the cementation phase and the shearing phase were recorded using this technique. The results show that for a given amount of cement, higher resistances are measured for the bio-cemented samples compared to gypsum. The mixing process is shown to produce homogeneous bio-cemented samples with higher strength and stiffness than the technique of flushing or injection commonly used, provided the amount of calcite is less than 4%. The results show that the bio-cement produces similar mechanical behavior to other artificially cemented sands.

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Section: Gypsum-cemented Sand Resultsmentioning

confidence: 85%

Section: Literature Reviewmentioning

confidence: 99%

Section: Unconfined Compressive Strength Testsmentioning

confidence: 99%

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Geomechanical Behavior of Bio-Cemented Sand for Foundation Works

Duraisamy¹,

Airey²

2020

Sandy Materials in Civil Engineering - Usage and Management

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“…With the increase of fiber length and content, the embedded depth and filling density of fibers in samples increased gradually, the fibers overlapped each other to form a network, the bridging effect was strengthened, and the residual stress σ r after failure increased gradually from zero. Except for sample U-12-0.6, ε f increased with the increase of fiber length and content, and under the same fiber content; basically, the larger the fiber length, the greater the ε f [ 25 ]. The sample U-12-0.4 had the largest ε f , which was 276.5% higher than that of treated via traditional EICP.…”

Section: Discussionmentioning

confidence: 99%

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

et al. 2021

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Enzyme-induced calcium carbonate precipitation (EICP) technology can improve the strength of treated soil. But it also leads to remarkable brittleness of the soil. This study used polyvinyl alcohol (PVA) fiber combined with EICP to solidify sand. Through the unconfined compressive strength (UCS) test, the effect of PVA fiber incorporation on the mechanical properties of EICP-solidified sand was investigated; the distribution of CaCO3 in the sample and the microstructure of fiber-reinforced EICP-treated sand were explored through the calcium carbonate content (CCC) test and microscopic experiment. Compared with the sand treated by EICP, the strength and stiffness of the sand reinforced by the fiber combined with EICP were greatly improved, and the ductility was also improved to a certain extent. However, the increase of CCC was extremely weak, and the inhomogeneity of CaCO3 distribution was enlarged; the influence of fiber length on the UCS and CCC of the treated sand was greater than that of the fiber content. The improvement of EICP-solidified sand by PVA fiber was mainly due to the formation of a “fiber–CaCO3–sand” spatial structure system through fiber bridging, not the increase of CCC.

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“…1, stiffness [115,118,[123][124][125][126][127][128][129][130][131][132], and thermal conductivity [133,134], etc. Some studies also proposed to further enhance the strength of bio-cemented soil by adding other materials, such as lime [42], fiber [54,125,[135][136][137][138][139][140][141][142][143], hydrogelassisted [144], the hydrophilic polymer [145,146], and alginate [147]. MICP based soil improvement involves a highly complex biological, physical and chemical process, which is mainly affected by the following four aspect factors: 1) soil properties, 2) urease producing bacteria (UPB) characteristics, 3) cementation solution (CS) parameters, and 4) treatment process.…”

Section: Strength Enhancement Of Soilmentioning

confidence: 99%

Recent development in biogeotechnology and its engineering applications

Cui

Chu

2021

Front. Struct. Civ. Eng.

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Microbial geotechnology or biogeotechnology is a new branch of geotechnical engineering. It involves the use of microbiology for traditional geotechnical applications. Many new innovative soil improvement methods have been developed in recent years based on this approach. A proper understanding of the various approaches and the performances of different methods can help researchers and engineers to develop the most appropriate geotechnical solutions. At present, most of the methods can be categorized into three major types, biocementation, bioclogging, and biogas desaturation. Similarities and differences of different approaches and their potential applications are reviewed. Factors affecting the different processes are also discussed. Examples of up-scaled model tests and pilot trials are presented to show the emerging applications. The challenges and problems of biogeotechnology are also discussed.

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Undrained Behavior of Microbially Induced Calcite Precipitated Sand with Polyvinyl Alcohol Fiber

Cited by 17 publications

References 25 publications

Geomechanical Behavior of Bio-Cemented Sand for Foundation Works

Geomechanical Behavior of Bio-Cemented Sand for Foundation Works

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

Recent development in biogeotechnology and its engineering applications

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