The role of bacterially induced calcite precipitation in self-healing of cement paste

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00347447" target="_blank" >RIV/68407700:21110/21:00347447 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.jobe.2021.102299" target="_blank" >https://doi.org/10.1016/j.jobe.2021.102299</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jobe.2021.102299" target="_blank" >10.1016/j.jobe.2021.102299</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The role of bacterially induced calcite precipitation in self-healing of cement paste

Popis výsledku v původním jazyce

Self-healing processes in cementitious materials have been intensively studied in recent years. They present a promising way to increase the durability of concrete and extend the service life of concrete structures, thus mitigating the impacts of the construction industry on public budgets and the environment. The role of bacterially induced calcite precipitation (BICP), the basis of one of the processes, is not fully understood yet, even though many researchers have reported improved mechanical properties or water tightness of cracked cementitious composites self-healed in the presence of bacteria. Therefore, the authors of this paper are focused on detailed characterization of BICP with the purpose of determining the direct impact of bacteria on the self-healing in cement composites. Three different bacterial strains, namely Sporosarcina pasteurii (SP), Bacillus cohnii (BC) and Bacillus pseudofirmus (BP) were studied. Their viability and metabolic activity in optimal and sub-optimal conditions were compared. Several analytical methods (XRF, TGA, TCD, FTIR) were used to characterize the attainable BICP depending on the particular strains. BP proved to be the most suitable bacterium, showing excellent viability and sufficient calcite production, even in sub-optimal conditions (10 °C temperature). Microscopic analysis of the self-healing products in artificially cracked cement paste showed that the application of BP with precipitation media lead to complete sealing of the crack by very dense calcite crystals (less than 1 μm), while porous structure of larger crystals (up to 30 μm) was formed in reference samples not treated with the bacteria, where only spontaneously induced calcite precipitation (SICP) occurred. As a result, it was proved that the bacteria directly contribute to the self-healing of cementitious materials and that BICP leads to the formation of a superior crack-sealing material.

Název v anglickém jazyce

The role of bacterially induced calcite precipitation in self-healing of cement paste

Popis výsledku anglicky

Self-healing processes in cementitious materials have been intensively studied in recent years. They present a promising way to increase the durability of concrete and extend the service life of concrete structures, thus mitigating the impacts of the construction industry on public budgets and the environment. The role of bacterially induced calcite precipitation (BICP), the basis of one of the processes, is not fully understood yet, even though many researchers have reported improved mechanical properties or water tightness of cracked cementitious composites self-healed in the presence of bacteria. Therefore, the authors of this paper are focused on detailed characterization of BICP with the purpose of determining the direct impact of bacteria on the self-healing in cement composites. Three different bacterial strains, namely Sporosarcina pasteurii (SP), Bacillus cohnii (BC) and Bacillus pseudofirmus (BP) were studied. Their viability and metabolic activity in optimal and sub-optimal conditions were compared. Several analytical methods (XRF, TGA, TCD, FTIR) were used to characterize the attainable BICP depending on the particular strains. BP proved to be the most suitable bacterium, showing excellent viability and sufficient calcite production, even in sub-optimal conditions (10 °C temperature). Microscopic analysis of the self-healing products in artificially cracked cement paste showed that the application of BP with precipitation media lead to complete sealing of the crack by very dense calcite crystals (less than 1 μm), while porous structure of larger crystals (up to 30 μm) was formed in reference samples not treated with the bacteria, where only spontaneously induced calcite precipitation (SICP) occurred. As a result, it was proved that the bacteria directly contribute to the self-healing of cementitious materials and that BICP leads to the formation of a superior crack-sealing material.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA18-15697S" target="_blank" >GA18-15697S: Samohojení cementových kompozitů v důsledku bakteriální kalcifikace</a><br>

Návaznosti

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

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Journal of Building Engineering

ISSN

2352-7102

e-ISSN

2352-7102

Svazek periodika

39

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

—

Kód UT WoS článku

000656539700003

EID výsledku v databázi Scopus

2-s2.0-85101359535