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

Terzis, Dimitrios; Hicher, Patrick; Laloui, Lyesse

doi:10.1038/s41598-020-73926-z

Cited by 11 publications

(4 citation statements)

References 27 publications

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“…The holes present on the surface of precipitate crystals in samples PF 1 C l and P-S 1 are thought to be the traces of bacteria, where bacterial encapsulation has not yet been totally completed. A similar pattern of results was obtained by [66,67]. Some crystals had no traces, which might be explained by the full bacterial decomposition [67].…”

Section: Semsupporting

confidence: 81%

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Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand

Zeitouny,

Lieske,

Alimardani Lavasan

et al. 2023

Geotechnics

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Microbially induced calcite precipitation (MICP) is a green bio-inspired soil solidification technique that depends on the ability of urease-producing bacteria to form calcium carbonate that bonds soil grains and, consequently, improves soil mechanical properties. Meanwhile, different treatment methods have been adopted to tackle the key challenges in achieving effective MICP treatment. This paper proposes the combined method as a new MICP treatment approach, aiming to develop the efficiency of MICP treatment methods and simulate naturally cemented soil. This method combines the premixing, percolation, and submerging MICP methods. The strength outcomes of Portland-cemented and MICP-cemented sand using the percolation and combined methods were compared. For Portland-cemented sand, the UCS values varied from 0.6 MPa to 17.2 MPa, corresponding to cementation levels ranging from 5% to 30%. For MICP-cemented sand, the percolation method yielded UCS values ranging from 0.5 to 0.9 MPa, while the combined method achieved 3.7 MPa. The strength obtained by the combined method is around 3.7 times higher than that of the percolation method. The stiffness of bio-cemented samples varied between 20 and 470 MPa, while for Portland-cemented sand, it ranged from 130 to 1200 MPa. In terms of calcium carbonate distribution, the percolation method exhibited higher concentration at the top of the sample, while the combined method exhibited more precipitation at the top and perimeter, with less concentration in the central bottom region, equivalent to 10% of a half section’s area.

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Section: Semsupporting

confidence: 81%

“…A similar pattern of results was obtained by [66,67]. Some crystals had no traces, which might be explained by the full bacterial decomposition [67].…”

Section: Semsupporting

confidence: 81%

Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand

Zeitouny,

Lieske,

Alimardani Lavasan

et al. 2023

Geotechnics

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“…Table 2 shows the treatment solution constituents used in this study. Calcium acetate was used as a calcium source to avoid acid fronts and the destruction of bacterial cells in EK biocementation as recommended in Terzis et al ( 2020 ). Namely, Terzis et al compared the performance of calcium chloride against calcium acetate and calcium lactate as calcium sources in EK biocementation.…”

Section: Methodsmentioning

confidence: 99%

An electrokinetic-biocementation study for clay stabilisation using carbonic anhydrase-producing bacteria

Mwandira,

Mavroulidou,

Satheesh

et al. 2023

Environ Sci Pollut Res

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This study investigates the feasibility of biocementing clay soil underneath a railway embankment of the UK rail network via carbonic anhydrase (CA) biocementation, implementing the treatments electrokinetically. Compared to previous biocementation studies using the ureolytic route, the CA pathway is attractive as CA-producing bacteria can sequester CO2 to produce biocement. Clay soil samples were treated electrokinetically using biostimulation and bioaugmentation conditions to induce biocementation. The effects of the treatment were assessed in terms of undrained shear strength using the cone penetration test, moisture content, and calcium carbonate content measurements. Scanning electron microscopy (SEM) analyses were also conducted on soil samples before and after treatment to evaluate the reaction products. The results showed that upon biostimulation, the undrained shear strength of the soil increased uniformly throughout the soil, from 17.6 kPa (in the natural untreated state) to 106.6 kPa. SEM micrographs also showed a clear change in the soil structure upon biostimulation. Unlike biostimulation, bioaugmentation did not have the same performance, although a high amount of CaCO3 precipitates was detected, and bacteria were observed to have entered the soil. The prospects are exciting, as it was shown that it is possible to achieve a considerable strength increase by the biostimulation of native bacteria capturing CO2 while improving the soil strength, thus having the potential to contribute both to the resilience of existing railway infrastructure and to climate change mitigation.

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“…This was achieved through injection 34,35 or surface percolation, 25 premixing, 36 spraying, 37 or permeation under electric elds. 38 However, the short shelf-life and lack of spatial control of these delivery strategies have hindered their commercial use. A more widespread application of MICP requires a better control over the location of bacteria and their metabolism to be optionally activated when required.…”

Section: Introductionmentioning

confidence: 99%

Controlling the calcium carbonate microstructure of engineered living building materials

et al. 2021

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

Cited by 11 publications

References 27 publications

Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand

Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand

An electrokinetic-biocementation study for clay stabilisation using carbonic anhydrase-producing bacteria

Controlling the calcium carbonate microstructure of engineered living building materials

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