Enhanced crack closure performance of microbial mortar through nitrate reduction

Erşan, Yusuf Çağatay; Hernandez-Sanabria, Emma; Boon, Nico; Belie, Nele De

doi:10.1016/j.cemconcomp.2016.04.001

Cited by 153 publications

(88 citation statements)

References 20 publications

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“…In the presence of calcium ions, NO 3 -reduction induces CaCO 3 precipitation. Our research has revealed that through NO 3 -reduction, even enhanced CaCO 3 precipitation performances could be achieved in nutrient-poor environments which makes the mechanism feasible for selfhealing concrete [18,49]. Nitrate reduction can also lead to the intermediate production of NO 2 -which is known as corrosion inhibitor.…”

Section: Bacterial Self-healing To Increase Concrete 7 Durability Andmentioning

confidence: 97%

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: Bacterial Self-healing To Increase Concrete 7 Durability Andmentioning

confidence: 97%

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

Belie

2016

RILEM Tech Lett

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“…When bacteria are used to heal cracks in cementitious materials, the crystal growth and crack width reduction can be monitored in time by using microscopic analysis . Also when crystalline admixtures, expansive agents, autogenous healing, promoted and stimulated autogenous healing with SAPs, microcapsules with bacteria and other healing agents, the combination of bacteria and SAPs, and sodium‐silicate saturated lightweight aggregates are studied, microscopic analysis can be used.…”

Section: Healing Efficiencymentioning

confidence: 99%

“…In this way, the healing products can be studied in time and as a function of the location. Bacterial precipitation can be studied qualitatively and quantitatively using the SEM technique . Based on counting of bacteria, conclusions may be drawn on their viability and ability to precipitate.…”

Section: Healing Efficiencymentioning

confidence: 99%

“…This gives information about the constitutional elements of the material studied, i.e., the formed healing crystals. If a small powder sample can be extracted, X‐ray diffraction and/or Fourier transform infrared spectroscopy (FTIR) is also an option to study the formed healing products in autogenous healing and bacterial healing, as well as attenuated total reflectance (ATR) FTIR . XRD measures the angles and intensities of diffracted incident X‐ray beams to determine the molecular structure of a crystal.…”

Section: Healing Efficiencymentioning

confidence: 99%

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Validation of Self‐Healing Properties of Construction Materials through Nondestructive and Minimal Invasive Testing

Snoeck

Malm

Cnudde

et al. 2018

Adv Materials Inter

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When studying the self‐healing properties of construction materials, a plethora of destructive and nondestructive testing (NDT) techniques can be used. In this review, the applicability of different nondestructive test methods is discussed in detail. The methods can be categorized whether they are used to study the encapsulation and/or protection mechanism of the healing agent, the sequestered healing agent itself, the distribution of healing agents, the trigger mechanism for healing, the healing efficiency, or healing performance. Based on this categorization, nondestructive techniques found in literature are discussed. In this way, a robust understanding of the different techniques can be used for future research on self‐healing construction materials.

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“…e quantitative analysis of the crack width and the ratio of cracks that could be healed was studied. Permeability of concrete, which is a direct reflection of the durability, was evaluated after self-healing [23][24][25][26]. However, limited works have been performed on the mechanical properties of concrete before and after bacterially based self-healing.…”

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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Enhanced crack closure performance of microbial mortar through nitrate reduction

Cited by 153 publications

References 20 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

Validation of Self‐Healing Properties of Construction Materials through Nondestructive and Minimal Invasive Testing

Self‐Healing of Concrete Cracks by Ceramsite‐Loaded Microorganisms

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