Chemical self-healing system with novel microcapsules for corrosion inhibition of rebar in concrete

Dong, Biqin; Ding, Weijian; Qin, Shaofeng; Han, Ningxu; Fang, Guohao; Liu, Yuqing; Xing, Feng; Hong, Shuxian

doi:10.1016/j.cemconcomp.2017.09.012

Cited by 75 publications

(35 citation statements)

References 42 publications

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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%

“…Lv et al used SEM to show that their developed polymeric microcapsules with phenyl formaldehyde resin shell have a regular globe shape and a smooth surface. Also Dong et al used SEM to show that their ethyl cellulose capsules had a spherical shape. The capsules of Lv et al and Dong et al ware prepared for embedment in cementitious self‐healing materials, but also when capsules are meant to be embedded in self‐healing asphalt, SEM has been applied by Su et al to study the surface morphology of their melamine formaldehyde capsules containing rejuvenator.…”

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

confidence: 99%

“…Also Dong et al used SEM to show that their ethyl cellulose capsules had a spherical shape. The capsules of Lv et al and Dong et al ware prepared for embedment in cementitious self‐healing materials, but also when capsules are meant to be embedded in self‐healing asphalt, SEM has been applied by Su et al to study the surface morphology of their melamine formaldehyde capsules containing rejuvenator. As the mixing process may have a big impact on the capsule morphology, Dong et al studied the shape of the capsules again after mixing by optical microscopy.…”

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

confidence: 99%

“…The capsules of Lv et al and Dong et al ware prepared for embedment in cementitious self‐healing materials, but also when capsules are meant to be embedded in self‐healing asphalt, SEM has been applied by Su et al to study the surface morphology of their melamine formaldehyde capsules containing rejuvenator. As the mixing process may have a big impact on the capsule morphology, Dong et al studied the shape of the capsules again after mixing by optical microscopy. Lv et al used X‐ray CT to prove that their phenyl formaldehyde resin microcapsules survived the mechanical mixing during sample preparation.…”

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

confidence: 99%

See 3 more Smart Citations

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…The performance of healing cracks can be enhanced by various parameters viz: biological agents [15][16][17][18][19][20][21], chemical agents [22], encapsulated capsules [23][24][25][26][27] and pozolonic materials [28]. There is an improvement in lifetime of concrete structure by crack healing.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Parameters of Bacterial Concrete

Durga¹,

Nerella²,

Madduru³

et al. 2019

ACSM

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Conventional concrete is prone to cracking under tensile load, despite its good compressive strength. Recently, biological agents have been applied to heal the cracks in concrete, making concrete structures more serviceable. This paper mainly attempts to evaluate the mechanical properties of bacteria-based self-healing concrete. Two bacteria were selected as the bioagents in concrete, namely, Bacillus subtilis and Bacillus halodurans. The concentration of the bioagents were set to 10 5~1 0 7 cell/mL in water. Then, the two bacteria were applied to cracked concrete to cure the cracks. After curing for several days, the bacteria-based self-healing concrete was subjected to compressive and flexural tests to estimate its mechanical parameters. The results show that the self-healing concretes cured for 14d and 28d had a 7% and 18% higher compressive strength than conventional concrete, respectively; the self-healing concretes cured for 14d and 28d had a 11% and 28% higher flexural strength than the conventional concrete, respectively. Thus, the bioagents could effectively heal the surface cracks on concrete, and make the concrete imperviable.

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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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Chemical self-healing system with novel microcapsules for corrosion inhibition of rebar in concrete

Cited by 75 publications

References 42 publications

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

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

Evaluation of Mechanical Parameters of Bacterial Concrete

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

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