A decade of progress and turning points in the understanding of bio-improved soils: A review

Terzis, Dimitrios; Laloui, Lyesse

doi:10.1016/j.gete.2019.03.001

Cited by 109 publications

(60 citation statements)

References 92 publications

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“…A range of cementing agents have been investigated including ordinary Portland cement (OPC), gypsum, sodium silicates, and calcium carbonate [14][15][16][17][18] to understand the influence of cementation and to simulate materials used in ground improvement work. Generally, the geomechanical responses of bio-cemented granular soil are similar to any other artificially cemented granular soil [7].…”

Section: Literature Reviewmentioning

confidence: 80%

“…Over the past decade, the potential for microbially induced calcite precipitation (MICP), or simply bio-cement, to improve soil and rock responses has been extensively studied by petroleum, geological, and civil engineers [4,5]. Recently, studies were undertaken to understand the geomechanical parameters of granular soils using microbes in biochemical process, which produce bio-cement in the subsurface [1,6,7]. It has been suggested [8] that these reactions simulate the natural geochemical processes that transform sand into sandstone.…”

Section: Literature Reviewmentioning

confidence: 99%

“…However, the MICP process is rapid and produces a precipitate with soft and powdery crystals, whereas natural limestone forms slowly and creates a very hard precipitate [6]. Most of this research has focused on the use of ureolytic bacteria, which have been shown to be capable, with the addition of urea and reagents, of producing calcite that binds to soil particles [6][7][8][9][10][11][12][13].…”

Section: Literature Reviewmentioning

confidence: 99%

“…A range of applications for bio-cement have been suggested. A recent example is a feasibility study carried using bio-cement for slope stabilization by means of a surficial treatment where a layer of hard stratum was obtained on the subsurface with UCS strength of 420 kPa after 10 days of treatment [7,26]. However, this method of treatment is not extensively applied in the field of ground engineering.…”

Section: Literature Reviewmentioning

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: Literature Reviewmentioning

confidence: 80%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Geomechanical Behavior of Bio-Cemented Sand for Foundation Works

Duraisamy¹,

Airey²

2020

Sandy Materials in Civil Engineering - Usage and Management

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“…In particular, microbially induced calcite precipitation (MICP), a ubiquitous bio‐geochemical process that occurs in soil and produces permanent inorganic precipitate serving as a binding between soil grains, has received the greatest research focus (Figure 1). As a multidisciplinary field of research, MICP has received extensive multifaceted investigations since it was introduced as a potential technique for soil improvement (Terzis & Laloui, ). A crucial part of the research has focused on the concept central to MICP, which involves bio‐geochemical processes (predominantly ureolysis) and their modelling.…”

Section: Introductionmentioning

confidence: 99%

Bio‐mediated soil improvement: The way forward

Jiang

Tang

Hata

et al. 2020

Soil Use and Management

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Bio‐mediated soil improvement involves the usage of microbes to improve soil engineering performance through a series of bio‐geochemical processes. In particular, Microbially Induced Calcite Precipitation (MICP), a ubiquitous bio‐geochemical process that occurs in soil and results in permanent inorganic cementation between soil grains, has received the greatest research focus. While substantial progress has been made to develop MICP as a mainstream soil improvement technique, we still need to: (a) improve our understanding of the fundamental microbial, chemical and flow processes involved; (b) achieve multi‐functionality by coupling engineering performance enhancement with ecological, environmental and carbon footprint benefits; and (c) maintain ecological balance and environmental friendliness, avoid long‐term deterioration and lower the energy demand.

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SANISAND‐C*: Simple ANIsotropic constitutive model for SAND with Cementation

Landivar Macias,

Rotta Loria

2023

Num Anal Meth Geomechanics

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Cemented sands exhibit superior mechanical properties compared to clean sands. Based on this evidence, ground improvement methods are increasingly employed to induce cementing reactions that can bind the solid particles of sands and other soils for the ultimate enhancement of their properties and behavior. Despite increasing ground improvement applications, constitutive models capable of capturing cementation effects on the mechanics of sands remain scarce. This article presents SANISAND‐C*: a constitutive model developed in the framework of bounding surface and critical state plasticity to capture cementation effects on the mechanics of sands. In this paper, the mathematical formulation of this model is presented first. Then, a vast amount of experimental data available for different materials (i.e., types of sand), loading conditions (i.e., stress levels and paths), and cementation types (i.e., natural and artificial cementations) is used to validate the model. Based on the comparison between experimental and simulation results, this work finally discusses the capabilities and limitations of the proposed model, highlighting that it can realistically capture key properties of cemented sands: increased strength and stiffness, increased dilatancy, and bond destructuration upon loading.

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A decade of progress and turning points in the understanding of bio-improved soils: A review

Cited by 109 publications

References 92 publications

Geomechanical Behavior of Bio-Cemented Sand for Foundation Works

Geomechanical Behavior of Bio-Cemented Sand for Foundation Works

Bio‐mediated soil improvement: The way forward

SANISAND‐C*: Simple ANIsotropic constitutive model for SAND with Cementation

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