Self-healing features in cementitious material with urea–formaldehyde/epoxy microcapsules

Dong, Biqin; Fang, Guohao; Ding, Weijian; Liu, Yuqing; Zhang, Jianchao; Han, Ningxu; Xing, Feng

doi:10.1016/j.conbuildmat.2015.12.140

Cited by 139 publications

(64 citation statements)

References 36 publications

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“…In particular, the fraction and size of microcapsules can be seen to have a pronounced effect not only on mechanical properties but also on pore structure and permeability (Table ). However, most researchers seem to identify a critical content below the effect of which is negligible or acceptable …”

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

show abstract

“…These phenomena indicate that the presence of the healing agent led to a more flowable mixture. The previous studies [17,27] show that bacterial nutrients, such as yeast extract, urea, and calcium salt, which were mixed with fresh concrete in self-healing concrete, had a negative effect on cement hydration in the early age.…”

Section: Resultsmentioning

confidence: 99%

“…These microcapsules are embedded in the concrete matrix and rupture as soon as cracks appear. Thus, the healing agent is released onto the crack face and crystals are produced to heal the cracks [17,18]. Self-healing by the encapsulation method can provide high-quality healing in terms of being able to repair cracks with a wider range of widths [2,8].…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Concrete Using Rubber Particles to Immobilize Bacterial Spores

Lian

Gao

et al. 2019

Materials

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Bacteria-based self-healing concrete is a construction material used to repair cracks in concrete, in which the bacterial spores are immobilized by bacteria carriers. However, the currently available bacteria carriers are not always suitable due to a complicated procedure or high cost. To develop a more suitable bacteria carrier as well as improve the anti-crack capability of self-healing concrete, in this study we evaluate the feasibility of using rubber particles as a novel bacteria carrier in self-healing concrete. Two types of self-healing concrete are prepared with rubber particles of different sizes to quantify the crack-healing effect. In addition, the fluidity and mechanical properties of the self-healing rubber concrete are compared with those of plain concrete and normal rubber concrete. The experimental results show that the self-healing rubber concrete with a particle size of 1~3 mm has a better healing capacity than the self-healing rubber concrete with a particle size of 0.2~0.4 mm, and the width value of the completely healed crack is 0.86 mm. The self-healing rubber concrete has a higher slump than the plain concrete and normal rubber concrete. According to the strength tests, the compressive strengths of the self-healing rubber concrete are low early on but they exceed those of the corresponding normal rubber concrete at 28 days. Moreover, the self-healing rubber concrete has higher splitting tensile strengths than the plain concrete and a better anti-crack capability. The results of a comparison to the other two representative bacterial carriers indicate that rubber particles have potential to be a widely used bacteria carrier for practical engineering applications in self-healing concrete.

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“…Visual observation, optical microscopy analysis, and SEM analysis can be useful techniques to study the size and the size distribution of (micro‐) capsules . Larger capsules can be microscopically studied whereas the smaller capsules should be studied with SEM analysis.…”

Section: Techniques To Study the Encapsulation And/or Protection Mechmentioning

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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Self-healing features in cementitious material with urea–formaldehyde/epoxy microcapsules

Cited by 139 publications

References 36 publications

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

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

Self-Healing Concrete Using Rubber Particles to Immobilize Bacterial Spores

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

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