Impregnation and encapsulation of lightweight aggregates for self-healing concrete

Alghamri, Rami; Kanellopoulos, Antonios; Al‐Tabbaa, Abir

doi:10.1016/j.conbuildmat.2016.07.143

Cited by 170 publications

(103 citation statements)

References 34 publications

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“…Given that aggregates are the main constituent of concrete, they have been used to host self‐healing agents. Thus, expanded clay lightweight aggregates (LWAs) were proposed as “containers” for the healing agent in replacement of part of regular aggregates . Sisomphon et al impregnated LWA with a sodium‐monofluorophosphate solution under vacuum to produce an effective self‐healing system in blast‐furnace slag cement mortars .…”

Section: Encapsulated Autonomous Self‐healing (Polymers or Minerals)mentioning

confidence: 99%

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

Belie

Gruyaert

Al‐Tabbaa

et al. 2018

Adv Materials Inter

489

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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Section: Encapsulated Autonomous Self‐healing (Polymers or Minerals)mentioning

confidence: 99%

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

Belie

Gruyaert

Al‐Tabbaa

et al. 2018

Adv Materials Inter

489

278

View full text Add to dashboard Cite

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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%

“…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%

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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“…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

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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Impregnation and encapsulation of lightweight aggregates for self-healing concrete

Cited by 170 publications

References 34 publications

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

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

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

Técnicas e Metodologias de Biomineralização na Cicatrização de Fissuras do Concreto

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