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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/60461373:22330/25:43931574

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA22-02702S" target="_blank" >GA22-02702S: Mikrobiologicky indukované srážení kalcitu při recyklaci betonu pro produkci materiálů se zápornou uhlíkovou stopou</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Cement and Concrete Composites

ISSN

0958-9465

e-ISSN

1873-393X

Svazek periodika

155

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

22

Strana od-do

—

Kód UT WoS článku

001359563600001

EID výsledku v databázi Scopus

2-s2.0-85209148211