Stabilization of sand particles by bio-cement based on CO 2 capture and utilization: Process, mechanical properties and microstructure

Zhan, Qiwei; Qian, Chunxiang

doi:10.1016/j.conbuildmat.2016.12.058

Cited by 30 publications

(10 citation statements)

References 12 publications

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“…To study the growth of a colony of microorganisms on a concrete plane [6][7][8][9], it is necessary to study the morphological and temporal characteristics of such growth under various initial conditions, as well as to establish the relationship between the morphological characteristics of bacteria and their growth rate as a factor that generally characterizes their activity. In this model, each microorganism in the colony is modeled separately, and this approach allows us to better understand the statistical principles of the growth kinetics of microorganisms.…”

Section: Discussionmentioning

confidence: 99%

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The study of the hardening process Portland cement`s concrete with bio cementing additives

et al. 2020

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The paper presents the results of studying the hardening processes of concrete based on Portland cement using biocementing additives. Isolated 11 strains of various bacteria were used as dietary supplements. The bacteria were grown at a temperature of 30 °C in an aerated fermenter with a stirrer speed of 550–600 rpm. The morphology of the concrete surface was evaluated before and after the application of the substrate with the nutrient medium; the appearance of a new phase was recorded after 2 weeks. The effect of cementation conditions on the compressive strength of biocemented concrete specimens was studied, and the capillary water`s coefficients absorption were determined.

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Section: Discussionmentioning

confidence: 99%

“…Despite the variety of additives added to cement, their choice is not always justified. The effect of the ratio of the dispersion of additives and cement and the associated optimal amount of additives has not been sufficiently studied [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The study of the hardening process Portland cement`s concrete with bio cementing additives

et al. 2020

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“…e calcium ion concentration decreased significantly under the effect of microorganism, and the calcium ion basically completely reacted at about 90 h. e carbon dioxide hydration reaction rate increased significantly, more carbonate was generated in a relatively short time, and carbonate mineral deposition was generated when reacting with calcium ions. e decrease rate of calcium ion concentration in the culture medium was slightly higher than that in the secretion, and the bacteria with a certain negative charge were first coupled with free Ca 2+ in the solution, which was regarded as nucleation site and promoted mineral deposition [15]. Figure 5 show the calcium carbonate deposition induced by bacterial in the simulated pore solution of steel slag.…”

Section: Acceleration Of Calcium Ion Depositionmentioning

confidence: 97%

The Influence of Microbial Agent on the Mineralization Rate of Steel Slag

Qian

2018

Advances in Materials Science and Engineering

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Bacteria-based mineralization is a new technique to use the steel slag. In this article, an experimental examination was performed to find out the steel slag advancement by the addition of the microbial agent that has the possibility to accelerate mineralization ability of bacteria. It is observed that, under natural and CO2 pressure curing conditions, the carbonation rate is significantly raised when microorganisms are added to the steel slag. The increased ratio of microorganisms leads to a better carbonation rate. The reaction products formed by bacteria mineralization were analyzed with the scanning electron microscope (SEM) and X-ray diffraction (XRD), and the amount of reaction products was examined by thermogravimetric analysis. The results show that the compressive strength and carbonation speed rose with the increase in microorganism content. Bacterial could accelerate the rate of carbon sequestration in the mineralization process. The compressive strength of steel slag with 1.5% bacterial could reach up to 51.5 MPa. The micron-sized and roughness mineralization product induced by microorganisms apparently resulted in a denser and compacted structure. The carbon depth increased by 50%, and the content of calcite increased by 3 times. These mineralization products would fill in the pore of steel slag cementitious materials and form the integrated and denser structure which produces more strength.

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“…Zhan and Qian [ 76 ] researched binding mechanisms of sand particles using MICP based on Paenibacillus bacteria. In their work, the binding effect of sand particles with bio-cement from the bacteria was evaluated based on the number of times the bio-cement was sprayed on the sand particles.…”

Section: Morphological and Chemical Evidence Of Bio-cemented Construction Materialsmentioning

confidence: 99%

“…This could be related to the increase in calcium carbonate content and the reduction in average porosity of the bio-cemented sand material with each increase in the number of sprays of the bio-cement. Zhan and Qian [ 76 ] reported that by increasing the number of bio-cement sprays, the average calcium carbonate content and average porosity of the bio-cemented sand materials were found to increase from 7.08% (one spray) to 14.36% (seven sprays); and to reduce from 18.3% (one spray) to 13.3% (seven sprays), respectively. To quantify calcium carbonate of the bio-cemented sand material, the method of acid washing was applied.…”

Section: Morphological and Chemical Evidence Of Bio-cemented Construction Materialsmentioning

confidence: 99%

Bio-Cementation in Construction Materials: A Review

2021

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The rapid development of the construction sector has led to massive use of raw construction materials, which are at risk of exhaustion. The problem is aggravated by the high demand for cement as binding powder and the mass production of clay bricks for construction purposes. This scenario has led to high energy consumption and carbon emissions in their production. In this regard, bio-cementation is considered a green solution to building construction, because this technology is environmentally friendly and capable of reducing carbon emissions, thus slowing the global warming rate. Most of the previously published articles have focused on microbiologically induced calcium carbonate precipitation (MICP), with the mechanism of bio-cementation related to the occurrence of urea hydrolysis as a result of the urease enzymatic activity by the microbes that yielded ammonium and carbonate ions. These ions would then react with calcium ions under favorable conditions to precipitate calcium carbonate. MICP was investigated for crack repair and the surface treatment of various types of construction materials. Research on MICP for the production of binders in construction materials has become a recent trend in construction engineering. With the development of cutting edge MICP research, it is beneficial for this article to review the recent trend of MICP in construction engineering, so that a comprehensive understanding on microbial utilization for bio-cementation can be achieved.

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Stabilization of sand particles by bio-cement based on CO 2 capture and utilization: Process, mechanical properties and microstructure

Cited by 30 publications

References 12 publications

The study of the hardening process Portland cement`s concrete with bio cementing additives

The study of the hardening process Portland cement`s concrete with bio cementing additives

The Influence of Microbial Agent on the Mineralization Rate of Steel Slag

Bio-Cementation in Construction Materials: A Review

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