Cell-free soil bio-cementation with strength, dilatancy and fabric characterization

Terzis, Dimitrios; Laloui, Lyesse

doi:10.1007/s11440-019-00764-3

Cited by 83 publications

(36 citation statements)

References 44 publications

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“…Compared with the hydrate‐free sand specimen (#T‐1), less θ orientations of the sand particles in the specimen after hydrate dissociation (#T‐2) are distributed in the range of 0–90° and 270–320°, while more are distributed in the ranges of 90–150° and 200–240°. Terzis and Laloui (2019) proposed intergranular contacts which exhibit a homogeneous directional and spatial distribution result into stronger force chain distribution and increase the overall resistance of the material, and this will enhance the strength. Thus, macroscopically, the hydrate‐free specimen (#T‐1) shows a higher strength than the specimen after hydrate dissociation (#T‐2) in this study.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure Evolution of Hydrate‐Bearing Sands During Thermal Dissociation and Ensued Impacts on the Mechanical and Seepage Characteristics

Liu

et al. 2020

JGR Solid Earth

102

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In this study, a microfocus X‐ray computed tomography‐based triaxial testing apparatus was used to observe and quantify the microstructure evolution of hydrate‐bearing sands during thermal dissociation of hydrate. Three triaxial shear tests with X‐ray computed tomography were conducted to study the influence of hydrate dissociation on the mechanical behavior of hydrate‐bearing sands. The results show that hydrate covering the sand particle surface dissociates first and then at the menisci between sand particles. The secondary hydrate formation mainly occurs on the menisci between sand particles and the surfaces of the hydrate shells where hydrates already exist. Hydrate dissociation could cause fabric changes in hydrate‐bearing sands, resulting in a more isotropic orientation distribution of sand particles. The failure behavior of the hydrate‐free sand specimen is similar to that of the specimen after hydrate dissociation, which shows an obvious drum‐shaped failure pattern with X‐shaped shear bands. However, the hydrate‐bearing sand specimen exhibits a shear band with a determined thickness and inclination angle. Hydrate dissociation could cause a significant loss of supporting cementation, resulting in a decline in the stiffness and failure strength. The failure strength of hydrate‐free sand specimen is slightly higher than that of the specimen after hydrate dissociation; this may due to that the homogeneous orientation frequency distribution can enhance the stability of the force chain between sand particles. The secondary hydrate formation causes sediment deformation resulting in a decrease in absolute permeability due to pore blockage.

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Section: Resultsmentioning

confidence: 99%

“…Theta ( θ ) and phi ( φ ) are used to describe the sand particles orientation (Terzis & Laloui, 2019), as illustrated in Figure 11. Theta ( θ ) corresponds to the angle between the major inertia axis of particles and the X–Y plane, ranging from 0° to 360°.…”

Section: Resultsmentioning

confidence: 99%

Microstructure Evolution of Hydrate‐Bearing Sands During Thermal Dissociation and Ensued Impacts on the Mechanical and Seepage Characteristics

Liu

et al. 2020

JGR Solid Earth

102

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“…MICP is applied using Sporosarcina Pasteurii cells on sand columns batch experiments following the treatment process previously reported in Terzis and Laloui 23 . Monitoring of the reaction is done using Electrical conductivity (EC) analysis coupled with Ion Chromatography (IC) measurements to detect ionic species and evaluate the depletion of reactants (Ca 2+ ) and production of ammonia (NH 4 + ) to compare EA-MICP with conventional MICP.…”

Section: Methodsmentioning

confidence: 99%

Direct currents stimulate carbonate mineralization for soil improvement under various chemical conditions

Terzis

Hicher

Laloui

2020

Sci Rep

Self Cite

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The present study integrates direct electric currents into traditional calcium carbonate mineralization to investigate electrochemical interactions and the subsequent crystalline growth of CaCO3 bonds in sand. A specific line of focus refers to the effect of three chemical reactive species involved in the stimulated geo-chemo-electric system, namely CaCl2, Ca(CH3COO)2 and Ca(CH3CH2(OH)COO)2. By altering treatment conditions and the applied electric field, we capture distinctive trends related to the: (i) overall reaction efficiencies and distribution of CaCO3 crystals is sand samples; (ii) promotion of CaCO3 mineralization due to DC (iii) crystallographic and textural properties of mineralized bonds. The study introduces the concept of EA-MICP which stands for Electrically Assisted Microbially Induced Carbonate Precipitation as a means of improving the efficiency of soil bio-cementation compared to traditional MICP-based works. Results reveal both the detrimental and highly beneficial effects that electric currents can hold in the complex, reactive and transport processes involved. An interesting observation refers to the “doped” morphology of CaCO3 crystals, which precipitate under electric fields, validated by crystallographic analyses and microstructural observations.

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“…Gomez et al [44] applied MICP to a variety of soils and found significant improvement in engineering properties. Other studies have also investigated the UCS of different types of soil and also analysed the CaCO 3 content [38,41,76,78,81,84,93,[95][96][97][98][99][100][101][102][103][104]. In some studies, the influence of CaCO 3 precipitation via MICP treatment on soil permeability has been assessed [38,78,80,84,95,97,100,101].…”

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

State-of-the-Art Review of Microbial-Induced Calcite Precipitation and Its Sustainability in Engineering Applications

et al. 2020

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Microbial-induced calcite precipitation (MICP) is a promising new technology in the area of Civil Engineering with potential to become a cost-effective, environmentally friendly and sustainable solution to many problems such as ground improvement, liquefaction remediation, enhancing properties of concrete and so forth. This paper reviews the research and developments over the past 25 years since the first reported application of MICP in 1995. Historical developments in the area, the biological processes involved, the behaviour of improved soils, developments in modelling the behaviour of treated soil and the challenges associated are discussed with a focus on the geotechnical aspects of the problem. The paper also presents an assessment of cost and environmental benefits tied with three application scenarios in pavement construction. It is understood for some applications that at this stage, MICP may not be a cost-effective or even environmentally friendly solution; however, following the latest developments, MICP has the potential to become one.

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Cell-free soil bio-cementation with strength, dilatancy and fabric characterization

Cited by 83 publications

References 44 publications

Microstructure Evolution of Hydrate‐Bearing Sands During Thermal Dissociation and Ensued Impacts on the Mechanical and Seepage Characteristics

Microstructure Evolution of Hydrate‐Bearing Sands During Thermal Dissociation and Ensued Impacts on the Mechanical and Seepage Characteristics

Direct currents stimulate carbonate mineralization for soil improvement under various chemical conditions

State-of-the-Art Review of Microbial-Induced Calcite Precipitation and Its Sustainability in Engineering Applications

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