Relationship between Bacterial Contribution and Self-Healing Effect of Cement-Based Materials

Šovljanski, Olja; Tomić, Ana; Markov, Siniša

doi:10.3390/microorganisms10071399

Cited by 17 publications

(9 citation statements)

References 130 publications

(143 reference statements)

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“…The essential step that enables the self-curing effect of bacteria-based concrete is reduce the surface tension and water loss with increase the bacterial production of carbonate ions which are transferred from cell to environment. This step also immediately provides an increase in system alkalinity [54]. However, this step is not necessarily the most important role that bacteria can play in CaCO 3 formation.…”

Section: Compressive Strengthmentioning

confidence: 99%

Microstructure and Strength Properties of Sustainable Concrete Using Effective Microorganisms as a Self-Curing Agent

et al. 2022

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In practical applications, problems related to proper curing arise for inclined structural elements, especially in skyscrapers, wherein concrete is very thick. To overcome this problem, the implementation of self-curing technology using varieties of smart materials has become significant. Based on these factors, this study determined the impact of effective microorganisms (EMs) as a new self-curing agent on the microstructures and strength properties of sustainable concrete. Five concrete mixtures were prepared with various EM content (5, 10, 15, 20, and 25%) as water replacement under air-curing condition. The workability of the concretes was found to increase with the increase in EM contents from 0 to 25%. In addition, concrete designed with 10% of EM achieved the highest compressive strength (42 MPa) after 28 days of aging as opposed to the control specimen (35 MPa). The microstructures of the concrete made with 10% of EM revealed very a compact network, fewer voids, and formulation of dense C-S-H gel. Based on the results, the proposed EM may be implemented as a self-curing agent to achieve high-performance sustainable concretes beneficial for the construction sectors.

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Section: Compressive Strengthmentioning

confidence: 99%

Microstructure and Strength Properties of Sustainable Concrete Using Effective Microorganisms as a Self-Curing Agent

et al. 2022

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“…There are several biological and biogenic processes, which can be utilized for this purpose such as oxidative deamination of aminoacids, oxidation of organic acids, and the hydrolysis of urea [14]. In MICP, calcium carbonate precipitation is achieved through the reaction of the products of metabolic and biogenic processes, namely, carbonate ions with calcium ions present in the soil pore fluid [15,16]. Traditional MICP (involving nitrogen cycle), mostly, relies on ureolytic bacteria catalyzing urea hydrolysis to produce ammonium and carbonate ions.…”

Section: Introductionmentioning

confidence: 99%

Non‐ureolytic microbially induced carbonate precipitation: Investigating a cleaner biogeotechnical engineering pathway for soil mechanical improvement

Hemayati,

Nematollahi,

Nikooee

et al. 2024

The Journal of Engineering

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As the world's population grows, there is an increasing need for soil improvement techniques to accommodate construction demands. Current methods, most often, suffer from a high CO2 footprint, leading researchers to resort to biological methods of soil improvement through microbially induced carbonate precipitation (MICP). Commonly used ureolytic microbial carbonate precipitation produces ammonium ions, which can be environmentally concerning. The present study, therefore, addresses the use of non‐ureolytic MICP for soil improvement. The process of non‐ureolytic MICP relies on the use of heterotrophic bacteria to catalyze the oxidation reaction of organic compounds, eventually calcium carbonate precipitation. In this study, heterotrophic bacteria, such as Bacillus subtilis and Bacillus amyloliquefaciens, have been investigated as a solution for soil improvement via an ammonium‐free MICP. Calcium formate and calcium acetate are used as both calcium and carbon sources. This study, furthermore, examines the impact of MICP treatment on sandy soil and the effect of compaction level on treated samples. The findings indicate that the non‐ureolytic MICP method is an effective approach for stabilizing sand. The Calcium Formate‐B.Subtilis composition is shown to be the most effective compound for improving the unconfined compressive strength of sandy soils, while the Calcium Acetate‐B.Amyloliquefaciens composition is the least effective.

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“…MICP was first referred to in the late nineteenth century in the studies of Murray and Irvine (1890) and Steinmann (1901), together with urea decomposition by the marine microbiota 17 . MICP is a natural biological process associated with various microbial activities and chemical processes, during which calcium carbonate precipitation occurs as a result of microbial metabolic products such that carbonate ions react with calcium ions in the environment 18 , 19 . MICP involving nitrogen cycle by the degradation of urea (ureolytic MICP) is the most common type of microbial-induced carbonate precipitation, in which the urease enzyme generated by the bacteria catalyzes the hydrolysis of urea 20 – 27 , described by the following reactions: …”

Section: Introductionmentioning

confidence: 99%

New non-ureolytic heterotrophic microbial induced carbonate precipitation for suppression of sand dune wind erosion

Hemayati

Nikooee

Habibagahi

et al. 2023

Sci Rep

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The detrimental effects of sand storms on agriculture, human health, transportation network, and infrastructures pose serious threats in many countries worldwide. Hence, wind erosion is considered a global challenge. An environmental-friendly method to suppress wind erosion is to employ microbially induced carbonate precipitation (MICP). However, the by-products of ureolysis-based MICP, such as ammonia, are not favorable when produced in large volumes. This study introduces two calcium formate-bacteria compositions for non-ureolytic MICP and comprehensively compares their performance with two calcium acetate-bacteria compositions, all of which do not produce ammonia. The considered bacteria are Bacillus subtilis and Bacillus amyloliquefaciens. First, the optimized values of factors controlling CaCO3 production were determined. Then, wind tunnel tests were performed on sand dune samples treated with the optimized compositions, where wind erosion resistance, threshold detachment velocity, and sand bombardment resistance were measured. An optical microscope, scanning electron microscope (SEM), and X-ray diffraction analysis were employed to evaluate the CaCO3 polymorph. Calcium formate-based compositions performed much better than the acetate-based compositions in producing CaCO3. Moreover, B. subtilis produced more CaCO3 than B. amyloliquefaciens. SEM micrographs clearly illustrated precipitation-induced active and inactive bounds and imprints of bacteria on CaCO3. All compositions considerably reduced wind erosion.

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Relationship between Bacterial Contribution and Self-Healing Effect of Cement-Based Materials

Cited by 17 publications

References 130 publications

Microstructure and Strength Properties of Sustainable Concrete Using Effective Microorganisms as a Self-Curing Agent

Microstructure and Strength Properties of Sustainable Concrete Using Effective Microorganisms as a Self-Curing Agent

Non‐ureolytic microbially induced carbonate precipitation: Investigating a cleaner biogeotechnical engineering pathway for soil mechanical improvement

New non-ureolytic heterotrophic microbial induced carbonate precipitation for suppression of sand dune wind erosion

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