Immobilizing bacteria in expanded perlite for the crack self-healing in concrete

Zhang, Jiaguang; Liu, Yuanzhen; Feng, Tao; Zhou, Mi; Zhao, Lin; Zhou, Aijuan; Zhu, Li

doi:10.1016/j.conbuildmat.2017.05.021

Cited by 236 publications

(125 citation statements)

References 18 publications

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“…Além da argila expandida, Alazhari et al (2018) obtiveram sucesso ao substituírem 20% da areia por perlita expandida, utilizando-a junto a Bacillus pseudofirmus. Zhang et al (2017) Além da maior eficiência na cicatrização das amostras com perlita expandida, pode-se ver que foi utilizado revestimento geopolimérico nas cápsulas. Essa proteção é feita devido a fragilidade que suas finas paredes apresentam, o que pode levar à sua ruptura prematura (SOURADEEP; KUA, 2016).…”

Section: Encapsulamentounclassified

“…Para fornecimento de uma fonte de cálcio às bactérias, são utilizados diversos nutrientes (também chamados por alguns autores de precursores químicos) como, por exemplo, nitrato de cálcio (WANG et al, 2014a(WANG et al, , 2014b(WANG et al, , 2014c, cloreto de cálcio (DE MUYNCK et al, 2008;PEI et al, 2013), acetato de cálcio (ALAZHARI et al, 2017;DE MUYNCK et al, 2008;JONKERS et al, 2010), e, o mais utilizado, lactato de cálcio (JONKERS, 2011;JONKERS et al, 2010;THIJSSEN, 2010;TZIVILOGLOU et al, 2016;WIKTOR;JONKERS, 2011;ZHANG et al, 2017). Entretanto, a adição de cloreto ao concreto pode gerar corrosão às armaduras, de modo que é mais comum o uso do lactato de cálcio ou do nitrato de cálcio (SEIFAN; SAMANI; BERENJIAN, 2016).…”

Section: Nutrição In Situunclassified

“…Entretanto, a adição de cloreto ao concreto pode gerar corrosão às armaduras, de modo que é mais comum o uso do lactato de cálcio ou do nitrato de cálcio (SEIFAN; SAMANI; BERENJIAN, 2016). Além dos nutrientes cálcicos definidos, podem-se utilizar nutrientes complexos, como extrato de levedura WANG et al, 2012WANG et al, , 2014aWANG et al, , 2017WANG et al, , 2014bWANG et al, , 2014cZHANG et al, 2017), extrato de carne (XU; WANG, 2018), e peptona WANG, 2018). realizaram testes com 4 nutrientes diferentes, a fim de avaliar seu impacto quanto à resistência à compressão das amostras.…”

Section: Nutrição In Situunclassified

“…Sabe-se que a fissuração ocorre quando há uma interconexão dos poros internos naturais a qualquer concreto (RECENA, 2014). Breugel (2007), Ferrara et al (2018) e Zhang et al (2017) afirmam que essas fissuras levam ao ingresso de agentes degradantes na forma de fluidos do ambiente externo, que reagem química e/ou fisicamente com sua estrutura interna (CLAISSE; ELSAYAD; SHAABAN, 1997). Zhang et al (2017) apontam alguns destes agentes como os sulfatos e cloretos.…”

Section: Introductionunclassified

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Técnicas e Metodologias de Biomineralização na Cicatrização de Fissuras do Concreto

Mello

Pacheco

Tutikian

2019

arqimed

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Concrete structures have become common all over the world, however the mateiral undergoes a cracking process, allowing the entrance of deleterious agents. Some countries are now spending more money on recovering existing structures than on building new ones. Thus, in the last decade, researchers have evaluated techniques to promote the selfhealing of concrete. It is known that the concrete has a small healing capacity due to the late hydration of anhydrous cement partickes, but it is limited to small cracks and it increases the consumption of cement, which generates financial and environmental disadvantages. In the search for more promising techniques, it has been studied the use of bacteria for the production of biominerals, which heal the cracks, reduce the permeability and the water absorption, and increase the compressive strenght. This study aims to present the state-ofart of this technique, approaching the species used and the methodology of insertion of the microorganisms in the concrete matrix. Among the taxonomic genus studied, there are advantages in the use of bactéria of the genus Bacillus, because they have physiology resistant to aggressive environments. As for the insertion of the bacteria in the concrete, advantages and disadvantages are presented in relation to their encapsulation in lightweight aggregates and their direct addition in the kneading water of the concrete. Gaps were still to be studied, such as the reduction of costs involved in the preparation of the material, improvement of design methodologies, simplification of the construction processes, verification of the durability of this concrete, and study of the inactive life in the bactéria within the hardened concrete.

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Section: Encapsulamentounclassified

Section: Nutrição In Situunclassified

Section: Introductionunclassified

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Técnicas e Metodologias de Biomineralização na Cicatrização de Fissuras do Concreto

Mello

Pacheco

Tutikian

2019

arqimed

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“…Carrier immobilization is a widely used protective method. A variety of carriers, such as porous particles, gels, and microcapsules, can provide a gentle environment for bacteria [14,[18][19][20][21][22]. Carriers should meet the requirements as follows: (1) good compatibility with concrete, (2) relatively high mechanical strength, and (3) high loading content.…”

Section: Introductionmentioning

confidence: 99%

Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms

Wang

Zuo

et al. 2018

Advances in Materials Science and Engineering

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Protective carrier is essential for the self-healing of concrete cracks by microbially induced CaCO 3 precipitation, owing to the harsh conditions in concrete. In this paper, porous ceramsite particles are used as microbial carrier. Heat treatment and NaOH soaking are first employed to improve the loading content of the ceramsite. e viability of bacterial spores is assessed by urea decomposition measurements. en, the self-healing efficiency of concrete cracks by spores is evaluated by a series of tests including compressive strength regain, water uptake, and visual inspection of cracks. Results indicate that heat treatment can improve the loading content of ceramsite while not leading to a reduction of concrete strength by the ceramsite addition. e optimal heating temperature is 750°C. Ceramsite particles act as a shelter and protect spores from high-pH environment in concrete. When nutrients and spores are incorporated in ceramsite particles at the same time, nutrients are well accessible to the cells. e regain ratio of the compressive strength increases over 20%, and the water absorption ratio decreases about 30% compared with the control. e healing ratio of cracks reaches 86%, and the maximum crack width healed is near 0.3 mm.

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