Experimental Investigation of the Mechanical Properties of MICP-Treated Sands Reinforced with Discrete Randomly Distributed Fiber

Li, Lin; Li, Mingdong; Ogbonnaya, Ubani; Wen, Kejun; Li, Chi; Amini, Farshad

doi:10.1061/9780784480120.007

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…This requires better understanding of the interface between microbial ecology and aqueous geochemistry. Urease activity is exhibited by various species of microorganisms [40], and the ability of urease to induce carbonate precipitation has been studied by several researchers [25,58,[90][91][92][93][94].…”

Section: Mechanisms Of Microbially Induced Calcite Precipitationmentioning

confidence: 99%

Review of the use of microorganisms in geotechnical engineering applications

et al. 2020

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Until recently, engineers either ignored or neglected the role of microorganisms in geotechnical engineering. The microbially induced calcite precipitation (MICP) research technique is an innovative and relatively green technology which consists in a biological process through which microorganisms react with minerals (calcium source and cementation reagent) to produce calcite (CaCO 3 ) as a byproduct that modifies and improves the engineering properties of soil. Laboratory and field results obtained from various studies are promising and viable, suggesting potential for various engineering applications. This research technique has also been considered to be useful in many engineering applications such as improvement of construction materials, cementation of porous media, improvement in strength and stiffness of engineering soils, hydraulic control of engineering facilities (waste containment), liquefaction, and erosion mitigation. In this review, the various methods of production of calcium carbonates (calcite), the role played by bacteria, various state-of-the-art procedures that have evolved in this research area, as well as ongoing studies are reported. Furthermore, the use of the MICP technique in remediation of contaminants and other environmental concerns is also presented. The advantages and challenges (in form of undesired byproducts) of this research technique are highlighted herein.

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Section: Mechanisms Of Microbially Induced Calcite Precipitationmentioning

confidence: 99%

Review of the use of microorganisms in geotechnical engineering applications

et al. 2020

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“…In fact, most authors argue that relative to the conventional cementation methods, MICP provides an alternative and environmentally friendly method for soil improvement [5][6][7]. Appreciable improvement in shear strength, ductility, and failure strain has been achieved with fiber addition in the MICP-treated sand [8,9]. In addition, it was observed in ref.…”

Section: Soil Improvement and Stabilization Techniques Andmentioning

confidence: 97%

Predicting Nanobinder-Improved Unsaturated Soil Consistency Limits Using Genetic Programming and Artificial Neural Networks

Ebid

Nwobia

Onyelowe

et al. 2021

Applied Computational Intelligence and Soft Computing

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Unsaturated soils used as compacted subgrade, backfill, or foundation materials react unfavorably under hydraulically bound environments due to swell and shrink cycles in response to seasonal changes. To overcome these undesirable conditions, additive stabilization processes are used to improve the volume change phenomenon in soils. However, the use of supplementary binders made from solid waste base powder materials has become necessary to deal with the hazards of greenhouse due to ordinary cement use. Meanwhile, several studies are being carried out to design infrastructures even with the limitations of insufficient or lack of equipment needed for efficient design performance. Intelligent prediction techniques have been used to overcome this shortcoming as the primary purpose of this research work. Therefore, in this work, genetic programming (GP) and artificial neural network (ANN) have been used to predict the consistency limits, i.e., liquid limits, plastic limit, and plasticity index of unsaturated soil treated with a composite binder known as hybrid cement (HC) made from blending nanostructured quarry fines (NQF) and hydrated-lime-activated nanostructured rice husk ash (HANRHA). The database needed for the prediction operation was generated from several experiments corresponding with treatment dosages of HANRHA between 0 and 12% at a rate of 0.1%. The results of the stabilization exercise showed substantial development on the soil properties examined, while the prediction exercise showed that ANN outclassed GP in terms of performance evaluation, which was conducted using sum of squared error (SSE) and coefficient of determination (R2) indices. Generally, nanostructuring of the component binder material has contributed to the success achieved in both soil improvement and efficiency of the models predicted.

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“…In order to compensate for the undesirable weakness of the brittle failure and low residual strength of biocemented soil, researchers have attempted to combine MICP technology with fiber reinforcement. Li et al [ 9 ] used a full-contact flexible mold to prepare MICP-treated sand samples with added fiber. Their results showed that fiber cooperation can improve shear strength and failure strain.…”

Section: Introductionmentioning

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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Experimental Investigation of the Mechanical Properties of MICP-Treated Sands Reinforced with Discrete Randomly Distributed Fiber

Cited by 3 publications

References 15 publications

Review of the use of microorganisms in geotechnical engineering applications

Review of the use of microorganisms in geotechnical engineering applications

Predicting Nanobinder-Improved Unsaturated Soil Consistency Limits Using Genetic Programming and Artificial Neural Networks

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

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