Desiccation Cracking Behavior of MICP-Treated Bentonite

Vail, Mark I.; Zhu, Cheng; Tang, Chao‐Sheng; Anderson, Luke; Moroski, Michael; Montalbo‐Lomboy, Melissa

doi:10.3390/geosciences9090385

Cited by 32 publications

(9 citation statements)

References 47 publications

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“…After the first treatment cycle, we observed a slight crack closure and rebonding. This matched findings from a previous study, which indicated that without cyclic treatments MICP-treated soil samples show fewer desiccation cracks ( 44 ).…”

Section: Resultssupporting

confidence: 89%

“…Based on the quantitative and qualitative comparisons presented in the Results section, MICP treatment was found to have a promising effect on crack remediation. This matched the findings of our prior study: MICP-treated soil samples show fewer desiccation cracks, as reflected by the surface crack ratio and average crack width ( 44 ). Mixing the cementation solution with the bacteria solution yielded the precipitation of numerous spherical CaCO 3 crystals of similar size, that were well-distributed spatially (Figure 4, b and d ).…”

Section: Discussionsupporting

confidence: 89%

“…A 100% water by weight was added to dry samples (initial water content = 100%). Following a prior study ( 43 , 44 ), we mixed the soil and water continuously for 10 min until reaching a homogeneous state, denoted by Treatment 0 in this study. To validate experimental repeatability, we made three parallel samples for each mixing ratio under each treatment type.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Desiccation Cracking Behavior of Clayey Soils Treated with Biocement and Bottom Ash Admixture during Wetting–Drying Cycles

Vail

Zhu

Tang

et al. 2020

Transportation Research Record: Journal of the Transportation R

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Desiccation cracking considerably impairs the hydraulic and mechanical properties of clayey soils that are critical to the long-term performance of infrastructure foundations and earth structures. Typical crack remediation methods are associated with high labor and maintenance costs or the use of environmentally unfriendly chemicals. Recycling waste materials and developing biomediated techniques have emerged as green, sustainable soil stabilization solutions. The objective of this study was to investigate the feasibility of soil crack remediation through use of bottom ash admixtures and microbial-induced calcite precipitation (MICP). We carried out cyclic wetting–drying tests to characterize the effects of bottom ash and MICP on the desiccation cracking behaviors of bentonite soils. Two groups of soil samples that contained different percentages of bottom ash (0%, 20%, 40% by weight) were prepared for cyclic water and MICP treatments, respectively. The desiccation cracking patterns captured by a high-resolution camera were quantified using image processing. We also employed scanning electron microscopy for microstructural characterizations. Experimental results revealed that cyclic water treatment resulted in more cracking, whereas cyclic MICP treatment improved soil strength owing to the precipitation of calcite crystals on the soil particle surface and inside the interparticle pores. Adding bottom ash to bentonite reduced the plasticity of the mixture, promoted the flocculation of clay particles by cation exchange, and also provided soluble calcium to enhance calcite precipitation. This study demonstrates the potential of bottom ash and MICP for crack remediation and brings new insights into the design and assessment of sustainable infrastructures under climate changes.

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Section: Resultssupporting

confidence: 89%

Section: Discussionsupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Desiccation Cracking Behavior of Clayey Soils Treated with Biocement and Bottom Ash Admixture during Wetting–Drying Cycles

Vail

Zhu

Tang

et al. 2020

Transportation Research Record: Journal of the Transportation R

View full text Add to dashboard Cite

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“…Under drying or warm settings, soil moisture content reduces, and overall volume shrinks. The subsequent incremental development of desiccation cracks creates detrimental consequences on expansive soil's mechanical and hydraulic behaviors [12]. Expansive soil consists of hydrophilic minerals, such as Illite and montmorillonite, and is a generally troublesome expansive soil conceived in natural geological processes.…”

Section: Expansive Soilmentioning

confidence: 99%

Determination of Geotechnical Properties and Stability of Expansive Soil using Fly Ash

Khan

Das

Dewangan

2021

Walailak J Sci & Tech

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This study was conducted to have a detailed analysis of the geotechnical properties of expansive soil and fly ash from Sipat thermal power plant. It reported the findings of laboratory studies on certain common physical and geotechnical properties. The chemical properties and morphology of the black cotton soil (BCS) and fly ash is also determined using scanning electron microscopy and X-ray diffraction test. The geotechnical test includes determining specific gravity, particle size distribution, moisture content, standard proctor test, free swell index, and Atterberg’s limit. The different compositions of expansive soil with fly ash, yellow soil, moorum, and sand are studied. BCS was evaluated with fly ash, fly ash and sand, BCS with yellow soil, and moorum and fly ash. The study also analyzed the details and results of different tests conducted on soil samples. The results showed that strength and fly ash are inversely proportional; as fly ash increases, strength decreases, and vice versa. Fly ash was added from 20 to 80 % by replacing expansive soil by weight. The results indicated that expansive soil can be stabilized by the addition of fly ash to a limit of 10 to 20 %. HIGHLIGHTS The XRD And SEM results shows the mineral present in the FlyAsh and Expansive soil The geotechnical properties of Flyash and expansive soil is determined The OMC increases with decrease in densities The Particle size distribution curve shows the soil is GW soil GRAPHICAL ABSTRACT

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“…Ou et al [17] used a combination of microbial and quicklime consolidation on overwet bauxite tailings clay and found that biochemical consolidation made the soil more compact. Vail et al [18] studied the desiccation cracking behavior of compacted calcium bentonite soil by using the MICP mixing method. They determined that MICP reactions effectively delay crack initiation and remediate desiccation cracking, as reflected by the decrease in the geometrical descriptors of the crack pattern, such as surface crack ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties and Disintegration Resistance of Microbially Solidified Granite Residual Soil

et al. 2022

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Microbially induced calcium carbonate (CaCO3) precipitation (MICP) is an emerging soil-treatment method. To explore the effect of this technology on granite residual soil, this study investigated the effects of the mechanical properties and disintegration resistance of microbially cured granite residual soil under different moisture contents by conducting direct shear and disintegration tests. The curing mechanism was also discussed and analyzed. Results showed that MICP can be used as reinforcement for granite residual soil. Compared with those of untreated granite residual soil, the internal friction angle of MICP-treated granite residual soil increased by 10% under a moisture content of 30%, while its cohesion increased by 218%. The disintegration rate of the MICP-treated granite residual soil stabilized after a maintenance time of 5 days under different water contents. Therefore, we provide the explanation that the improvement of the shear strength and disintegration resistance of granite residual soil is due to CaCO3 precipitation and the surface coating.

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Desiccation Cracking Behavior of MICP-Treated Bentonite

Cited by 32 publications

References 47 publications

Desiccation Cracking Behavior of Clayey Soils Treated with Biocement and Bottom Ash Admixture during Wetting–Drying Cycles

Desiccation Cracking Behavior of Clayey Soils Treated with Biocement and Bottom Ash Admixture during Wetting–Drying Cycles

Determination of Geotechnical Properties and Stability of Expansive Soil using Fly Ash

Experimental Study on the Mechanical Properties and Disintegration Resistance of Microbially Solidified Granite Residual Soil

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