Exploiting Bacillus pseudofirmus and Bacillus cohnii to promote CaCO3 and AFt phase formation for stabilizing waste concrete fines

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00378643" target="_blank" >RIV/68407700:21110/25:00378643 - isvavai.cz</a>
Alternative codes found
RIV/60461373:22330/25:43931574
Result on the web
<a href="https://doi.org/10.1016/j.cemconcomp.2024.105839" target="_blank" >https://doi.org/10.1016/j.cemconcomp.2024.105839</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cemconcomp.2024.105839" target="_blank" >10.1016/j.cemconcomp.2024.105839</a>

Result language
angličtina
Original language name
Exploiting Bacillus pseudofirmus and Bacillus cohnii to promote CaCO3 and AFt phase formation for stabilizing waste concrete fines
Original language description
In this study, we explored the potential of microbiologically induced calcite precipitation (MICP) for enhancing the microstructural integrity of waste concrete fines (WCF). Traditionally, ureolytic bacteria, such as Sporosarcina pasteurii, have been widely used in MICP due to their ability to produce calcium carbonate via urea hydrolysis, but this process generates ammonia, raising environmental concerns. As an alternative, we employed the carbonic anhydrase pathway using Bacillus pseudofirmus and Bacillus cohnii to induce biomineralization without ammonia byproducts. We examined three types of WCF materials and found that samples containing gypsum facilitated the formation of AFt phases (ettringite/thaumasite crystals) when treated with these bacteria, significantly increasing WCF cohesion and forming strong conglomerates. Comparative analysis revealed that facultative anaerobes exploiting the carbonic anhydrase pathway outperformed ureolytic bacteria in strengthening the material. Investigations into pre-compaction and feather fiber reinforcement did not yield improvements in strength and stiffness.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20101 - Civil engineering

Project
<a href="/en/project/GA22-02702S" target="_blank" >GA22-02702S: Microbiologically induced calcite precipitation for production of carbon-negative building materials from recycled concrete</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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