Geopolymer Coating of Bacteria-containing Granules for Use in Self-healing Concrete

Koster, Stefan A.L. de; Mors, R.M.; Nugteren, Henk; Jonkers, H.M.; Meesters, G.M.H.; Ommen, J. Ruud van

doi:10.1016/j.proeng.2015.01.193

Cited by 81 publications

(35 citation statements)

References 4 publications

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“…The issue of granularity renders this method unattractive for applications where the size of encapsulated additions can affect the mechanical properties of materials and structural components. Recently two studies reported the use of pan coating to encapsulate active compounds for the production of self-healing concrete [13,14]. Nonetheless, in both studies, issues associated with the thickness and integrity of the shell were reported.…”

Section: Physical Methodsmentioning

confidence: 99%

Polymeric microcapsules with switchable mechanical properties for self-healing concrete: synthesis, characterisation and proof of concept

Kanellopoulos

Palmer²,

Kerr³

et al. 2017

Smart Mater. Struct.

127

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Microcapsules, with sodium silicate solution as core, were produced using complex coacervation in a double, oil-in-water-in oil, emulsion system. The shell material was a gelatin-acacia gum crosslinked coacervate and the produced microcapsules had diameters ranging from 300 to 700 μm. The shell material designed with switchable mechanical properties. When it is hydrated exhibits soft and 'rubbery' behaviour and, when dried, transitions to a stiff and 'glassy' material. The microcapsules survived drying and rehydrating cycles and preserved their structural integrity when exposed to highly alkaline solutions that mimic the pH environment of concrete. Microscopy revealed that the shell thickness of the microcapsules varies across their perimeter from 5 to 20 μm. Thermal analysis showed that the produced microcapsules were very stable up to 190°C. Proof of concept investigation has demonstrated that the microcapsules successfully survive and function when exposed to a cement-based matrix. Observations showed that the microcapsules survive mixing with cement and rupture successfully upon crack formation releasing the encapsulated sodium silicate solution.

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Section: Physical Methodsmentioning

confidence: 99%

Polymeric microcapsules with switchable mechanical properties for self-healing concrete: synthesis, characterisation and proof of concept

Kanellopoulos

Palmer²,

Kerr³

et al. 2017

Smart Mater. Struct.

127

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“…In order to extend the applicability range, the volume of added healing agent was reduced by increasing the content of efficient healing agent constituent in particles. A way of producing scalable particles almost fully consisting of active ingredients is by roller compacting spore powders to sheets, with subsequent milling to flakes that are in the size range of the sand fraction (1–4 mm) . A typical property of these flakes is solubility in water, which is beneficial for matrix cracking and water ingress, dispersing the healing agent in the crack volume.…”

Section: Self‐healing Bioconcretementioning

confidence: 99%

A Review of Self‐Healing Concrete for Damage Management of Structures

Belie

Gruyaert

Al‐Tabbaa

et al. 2018

Adv Materials Inter

523

278

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The increasing concern for safety and sustainability of structures is calling for the development of smart self-healing materials and preventive repair methods. The appearance of small cracks (<300 µm in width) in concrete is almost unavoidable, not necessarily causing a risk of collapse for the structure, but surely impairing its functionality, accelerating its degradation, and diminishing its service life and sustainability. This review provides the state-ofthe-art of recent developments of self-healing concrete, covering autogenous or intrinsic healing of traditional concrete followed by stimulated autogenous healing via use of mineral additives, crystalline admixtures or (superabsorbent) polymers, and subsequently autonomous self-healing mechanisms, i.e. via, application of micro-, macro-, or vascular encapsulated polymers, minerals, or bacteria. The (stimulated) autogenous mechanisms are generally limited to healing crack widths of about 100-150 µm. In contrast, most autonomous self-healing mechanisms can heal cracks of 300 µm, even sometimes up to more than 1 mm, and usually act faster. After explaining the basic concept for each self-healing technique, the most recent advances are collected, explaining the progress and current limitations, to provide insights toward the future developments. This review addresses the research needs required to remove hindrances that limit market penetration of self-healing concrete technologies.

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“…No caso das bactérias ureolíticas, a energia adquirida com o consumo de nutrientes leva à produção da enzima urease, a qual catalisa a hidrólise da ureia e culmina na precipitação de carbonato de cálcio. Este, por sua vez, fecha as fissuras e impede nova entrada de água (Koster et al, 2015). Sem água, as bactérias retornam à sua condição inicial de latência até que nova solicitação aconteça.…”

Section: Micp Por Meio De Degradação De Ureiaunclassified

Concreto Autocicatrizante Pela Introdução De Bactérias – Uma Revisão

CARNEIRO¹,

PAULA²,

AGUIAR³

et al. 2019

Memorias Conpat 2019

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RESUMOEste trabalho explora as características, limitações e desafios de concretos autocicatrizantes pela introdução de bactérias. Uma revisão sistemática foi realizada, sobretudo, por meio da seleção de publicações dos últimos dez anos na área. Em condições favoráveis, as bactérias induzem a precipitação de carbonato de cálcio, o qual é depositado nos poros do concreto, diminuindo sua porosidade e aumentando sua resistência mecânica. O tipo de bactéria utilizado e seus nutrientes afetam diretamente os produtos formados. Bactérias ureolíticas do gênero Bacillus são o tipo mais investigado. O efeito de autocicatrização é mais pronunciado nas primeiras idades do concreto, diminuindo progressivamente ao longo do tempo. O encapsulamento ou imobilização das bactérias pode prolongar sua vida útil no meio alcalino do concreto. Palavras-chave: concreto autocicatrizante; precipitação de calcita induzida microbiologicamente; bactérias no concreto. ABSTRACTThis paper explores the caracteristics, limitations and challenges of bacteria based self-healing concrete. A systematic review was carried out by selecting publications of the last ten years on the area. Under proper conditions, bacteria induce the precipitation of calcium carbonate, which is deposited inside the concrete pores, decreasing its porosity and increasing its compressive strength. Bacteria type and its nutrientes, directly affect the precipitated products. Ureolytic bacteria, of the genus Bacillus, are the most investigated type, due to their high resistance to alcaline media. Self-healing effect is higher at early ages concretes, dropping progressively over time. In order to avoid this, bacteria are encapsulated or immobilized by protective materials, which increases theirs life cycle inside concrete's alcaline medium. Keywords: self-healing concrete; microbially induced calcite precipitation; bacteria in concrete; RESUMENEste artículo explora las características, limitaciones y desafíos de los hormigones autocurativos mediante la introducción de bacterias. Se realizó una revisión sistemática principalmente seleccionando publicaciones de los últimos diez años en el área. En condiciones favorables, las bacterias inducen la precipitación de carbonato de calcio, que se deposita en los poros del hormigón, reduciendo su porosidad y aumentando su resistencia mecánica. El tipo de bacteria utilizada y sus nutrientes afectan directamente los productos formados. Las bacterias ureolíticas del género Bacillus son el tipo más investigado. El efecto de autocuración es más pronunciado en las primeras edades del hormigón, disminuyendo progresivamente con el tiempo. La encapsulación o inmovilización de bacterias puede prolongar su vida útil en el medio alcalino del hormigón. Palabras clave: hormigón autocurativo; precipitación de calcita microbiológicamente inducida; bacterias en el concreto.

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Geopolymer Coating of Bacteria-containing Granules for Use in Self-healing Concrete

Cited by 81 publications

References 4 publications

Polymeric microcapsules with switchable mechanical properties for self-healing concrete: synthesis, characterisation and proof of concept

Polymeric microcapsules with switchable mechanical properties for self-healing concrete: synthesis, characterisation and proof of concept

A Review of Self‐Healing Concrete for Damage Management of Structures

Concreto Autocicatrizante Pela Introdução De Bactérias – Uma Revisão

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