Microbially induced calcite precipitation effect on soil thermal conductivity

Venuleo, Sara; Laloui, Lyesse; Terzis, Dimitrios; Hueckel, Tomasz; Hassan, Mohsen A.

doi:10.1680/jgele.15.00125

Cited by 56 publications

(31 citation statements)

References 24 publications

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“…Geothermal energy is a clean, renewable, and sustainable energy resource, which has various engineering applications, such as ground source heat pumps (GSHPs) and geothermal energy piles (GEPs) [1]. e performance of such underground energy structures is strongly affected by the saturation degree of soils [2]. It is found that low saturation degree reduced soil thermal conductivity, which lowered the efficiency of heat exchange between soils and the structures [3].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Dry Sands Treated with Microbial-Induced Calcium Carbonate Precipitation

Wang

Zhang

Lin

et al. 2019

Advances in Materials Science and Engineering

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With an increasing energy demand, exploration and utilization of new energy resources become more significant recently. Geothermal energy, characterized as a clean, renewable, and sustainable energy, has various engineering applications. Microbial-induced calcium carbonate precipitation (MICP) technique has a potential to improve soil thermal properties for geothermal applications. In this study, thermal conductivity of dry sands treated using MICP technique with different treatment cycles was investigated in laboratory. The results showed that thermal conductivity of MICP-treated sands was much higher than that of the untreated sand under dry condition and it increased with increasing treatment cycles. Based on the scanning electron microscopy (SEM) analyses, it is found MICP-induced CaCO3 crystals are being formed among sand particles functioned as “thermal bridge,” which provided more highly effective heat transfer path. It is concluded that the MICP technique could significantly improve the thermal conductivity of sands and the overall heat transfer efficiency. It is advantageous to use MICP-treated soils as enhanced grout materials for underground energy geostructures.

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Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Dry Sands Treated with Microbial-Induced Calcium Carbonate Precipitation

Wang

Zhang

Lin

et al. 2019

Advances in Materials Science and Engineering

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“…In the framework of small strains, assuming the solid grains incompressible and an isotropic material behavior, we propose a yield function along the lines of Modified Cam Clay, extended to account for an isotropic tensile strength function (e.g. see [34], [46], [41] and [1]), as follows:…”

Section: Plastic Behaviormentioning

confidence: 99%

“…It is worth emphasizing that for If instead, for simplicity, we consider stress-independent elasticity, so that the bulk modulus K is assumed constant (as is also assumed for the shear modulus G ), by exploiting the additive decomposition of strain which leads upon integration to the hardening law ( 5).…”

Section: Appendix B Hardening Lawmentioning

confidence: 99%

“…For this reason, different soil improvement techniques exist to provide artificial cementation to originally loose or weakly cemented soils; one of the most recently emerged being microbially induced calcite precipitation (e.g. [1]- [4]) to manage mechanical, hydraulic or heat transfer properties [5].…”

Section: Introductionmentioning

confidence: 99%

“…From the constitutive point of view, the mechanical behavior of bonded soils/soft rocks has been investigated in the framework of critical state through extended versions of Cam Clay (e.g. see [34], [40]). Based on these works, account for the coupled chemo-mechanical behavior was later taken, in the constitutive models proposed by [41], [28], [29].…”

Section: Introductionmentioning

confidence: 99%

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Chemo-mechanical modeling of artificially and naturally bonded soils

Gajo

Cecinato

Hueckel

2019

Geomechanics for Energy and the Environment

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Chemo-mechanical effects are known to be significant in a number of applications in modern geomechanics, ranging from slope stability assessment to soil improvement and CO2 sequestration. This work focuses on coupled chemo-mechanical modeling of bonded geomaterials undergoing either mechanical strengthening, due to increased cementation, or weakening, due to cement dissolution. A constitutive model is developed that accounts for the multi-scale nature of the chemo-mechanical problem, introducing some cross-scale functions establishing a relationship between the evolution of microscopic variables and the macroscopic material behavior, realistically following the evolution of the reactive surface area, cross-sectional area and the number of bonds along with dissolution/deposition. The model presented here builds up on a previously introduced framework. However, at variance with existing works, it is specialized on materials with only reactive bonds, such as carbonate cemented sandstone or microbially cemented silica sand. Model validation is provided upon reproducing different types of chemomechanical experimental datasets, on different naturally and artificially cemented materials, to establish the reliability of the proposed framework.

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Development of state of art test setup to measure thermal conductivity of soils infused with treated and un‐treated natural microorganisms

Shah,

Tandel,

Mistry

et al. 2023

Environmental Quality Mgmt

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Soil is a natural heterogeneous material and from its formation process, heat transfer capacity (thermal conductivity) of soil is playing vital role in many engineering applications. The aim of this research study is to enhance thermal conductivity using natural and treated bacteria from soil samples procured from four different regions namely Dholera, Navsari, Sabarmati River, and Madhavpur of Gujarat, India. To fulfill this objective, thermal conductivity test set‐up was indigenously developed based on guarded hot plate method and is calibrated up to 150°C temperature. The colonies of microorganisms available in soil were studied by serial dilution and spread plate technique. Further, influence of microorganisms on soil structure aggregation pre and post treatment was analyzed by microscope. Four types of microorganisms were introduced in the soil and the thermal conductivity of sample is measured for curing period of 7, 14, 21, and 28 days. The results indicate increment in k value for thermal conductivity in clayey soil up to 26.67% and decrement in sandy soil is up to 45.45%, while most optimum results were observed for 7 days curing period. Present research demonstrates use of microbes available in various soils to enhance heat transfer mechanism through proper identification and treatment.

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Microbially induced calcite precipitation effect on soil thermal conductivity

Cited by 56 publications

References 24 publications

Thermal Conductivity of Dry Sands Treated with Microbial-Induced Calcium Carbonate Precipitation

Thermal Conductivity of Dry Sands Treated with Microbial-Induced Calcium Carbonate Precipitation

Chemo-mechanical modeling of artificially and naturally bonded soils

Development of state of art test setup to measure thermal conductivity of soils infused with treated and un‐treated natural microorganisms

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