Improved strength and durability of fly ash-amended concrete by microbial calcite precipitation

Achal, Varenyam; Pan, Xiangliang; Özyurt, Nilüfer

doi:10.1016/j.ecoleng.2010.11.009

Cited by 237 publications

(87 citation statements)

References 24 publications

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“…Achal et al [24] noticed that the average number of viable bacteria decreased from 6•10 6 to 4.5•10 4 after 7 d, which means most bacteria died and bacterial growth was greatly inhibited since there was no difference in cell numbers at 7 d and 28 d.…”

Section: Microbial Caco 3 For Strength Improvementmentioning

confidence: 99%

Application of bacteria in concrete: a critical evaluation of the current status

Belie

2016

RILEM Tech Lett

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Microbially induced carbonate precipitation has been tested over more than a decade as a technique to enhance concrete properties. Mainly bacteria following the pathways of urea decomposition, oxidation of organic acids, or nitrate reduction have been studied for this purpose. For bacteria mixed into fresh concrete, it is difficult to prove that they actively contribute to calcium carbonate precipitation and the effects on concrete strength are variable. Application of bacteria for surface consolidation has been shown to reduce water absorption and increase durability. Microbial self-healing of cracks in concrete shows promising results at the laboratory scale. Especially the use of self-protected mixed cultures opens perspectives for practical application. However, their self-healing efficiency needs to be further proven in larger concrete elements, and under non-ideal conditions. The use of denitrifying cultures for concurrent self-healing and production of corrosion inhibiting nitrites is a promising new strategy.

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Section: Microbial Caco 3 For Strength Improvementmentioning

confidence: 99%

Application of bacteria in concrete: a critical evaluation of the current status

Belie

2016

RILEM Tech Lett

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“…We regard both of these approaches Cement and Concrete Research 67 (2015) 237-245 (i.e., suspending bacterial cells in mixing water or replacing the mixing water with a bacterial culture) as "vegetative inoculation" approaches. Achal et al [9] inoculated vegetative Bacillus megaterium cells in nutrient broth to mortar and concrete; an increase in compressive strength and a decrease in permeability were observed in both systems. Ghosh et al [10,11] suspended Shewanella in the mixing water of mortar.…”

Section: Introductionmentioning

confidence: 95%

Biomineralized cement-based materials: Impact of inoculating vegetative bacterial cells on hydration and strength

Bundur

Kirisits

Ferron

2015

Cement and Concrete Research

143

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“…Various materials have been tested to elaborate biocement, highlighting: cement mixtures of the Portland type and sand (Abo-El-Enein et al, 2012;Abo-El-Enein, Ali, Talkhan & AbdelGawwad, 2013;Park et al, 2010), ash (Achal, Pan, & Özyurt, 2011b), river sand and cement in a 1:3 ratio (Achal et al, 2013) and sand (Annamalai et al, 2012). The culture is generally added to the materials in a column so that when calcium carbonate precipitates, important factors that are taken into account in the durability of cement can be assessed, such as: water absorption (AboEl- Enein et al, 2012Enein et al, , 2013Achal et al, 2011), compression resistance (Abo-El-Enein et al, 2012Achal et al, 2011a), crack or fissure remediation (Achal et al, 2013), impermeability to water by measuring penetration resistance (Achal et al, 2011a) and total porosity (Achal et al, 2013); the results obtained were positive, including a porosity reduction of up to 50% in the materials used, and with a significant decrease in chlorine and water permeability, which would allow their potential use in structures or buildings.…”

Section: Inclusion Of Other Materials In the Biocementmentioning

confidence: 99%

Soil bacteria that precipitate calcium carbonate: mechanism and applications of the process

Acuña¹,

Becerra²,

Martínez³

et al. 2018

Acta Agron.

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Bacteria with ureasic activity are microorganisms found in soil that in presence of urea and calcium, they can produce calcium carbonate, a process known as microbiologically induced calcium carbonate precipitation (MICP). This article discusses this process and its mechanism, as well as bacterial urease, calcium carbonate crystals formed, and factors that affect the efficiency of MICP, as type of bacteria, bacterial cell concentrations, pH, temperature and calcium and urea concentrations. In addition, applications as removal of heavy metals in water, bioconsolidation, biocement and CO 2 sequestration are also discussed.Keywords: Biomineralization; Bacillus; urease; carbonates; heavy metals; bioconsolidation; biocementation. ResumenLas bacterias con actividad ureásica son microorganismos que se encuentran en el suelo, y que en presencia de urea y calcio, pueden producir carbonato de calcio, proceso conocido como precipitación de calcio inducida microbiológicamente (PCIM). Este artículo trata este proceso y su mecanismo, además de las ureasas de origen bacteriano, los cristales de carbonato de calcio formado, los factores que afectan la eficiencia la PCIM, como el tipo de bacteria, las concentraciones de células bacterianas, el pH, la temperatura y las concentraciones de calcio y urea. Además, se incluye las aplicaciones como la remoción de metales pesados en aguas, la bioconsolidación, biocemento y secuestro de CO 2 .

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Improved strength and durability of fly ash-amended concrete by microbial calcite precipitation

Cited by 237 publications

References 24 publications

Application of bacteria in concrete: a critical evaluation of the current status

Application of bacteria in concrete: a critical evaluation of the current status

Biomineralized cement-based materials: Impact of inoculating vegetative bacterial cells on hydration and strength

Soil bacteria that precipitate calcium carbonate: mechanism and applications of the process

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