Performance recovery concerning the permeability of concrete by means of a microcapsule based self-healing system

Dong, Biqin; Fang, Guohao; Wang, Yanshuai; Liu, Yuqing; Hong, Shuxian; Zhang, Jianchao; Lin, Shuai; Xing, Feng

doi:10.1016/j.cemconcomp.2016.12.005

Cited by 140 publications

(34 citation statements)

References 38 publications

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“…These measurements have been further complemented by monitoring crack mouth and depth healing with time. Nonetheless long‐term stability and repeatability of the healing ability has yet not been addressed; although recent studies have been investigating healing on mature specimen (length of curing 2–3 months) . Optimum dosages have been considered mainly in terms of durability indicators, but heavily depend on the size of microencapsulated agents as well as the proposed healing agent and can differ for different types of microencapsulation suites.…”

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

confidence: 99%

“…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%

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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

528

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%

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

528

278

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“…Crack widths smaller than 10μm do not allow chloride penetration along the crack path. Dong (2017) showed that the chloride diffusion coefficient decreased from 8.15 to 6.53 (x 10-12 m2 s-1) after 28-day healing. The healing efficiency of permeability reached a maximum rate equal to 19.8%.…”

Section: Introductionmentioning

confidence: 97%

Crack sealing capacity in chloride-rich environments of mortars containing different cement substitutes and crystalline admixtures

Borg

Cuenca

Brac

et al. 2017

Journal of Sustainable Cement-Based Materials

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This paper presents the results of a preliminary study aimed at assessing the crack sealing capacity in chloride environments of different concrete mixtures, incorporating supplementary cementitious materials as well as self healing enhancing crystalline admixtures. For each addition, also including pulverized fuel ash and silica fume, different contents were taken into consideration. Cylinder specimens were pre-cracked in splitting up to three different crack opening ranges, simulating different service conditions, and then exposed to different conditioning environments, also containing different concentrations of sodium chloride and including both permanent immersion and wet/dry cycles. Healing conditioning was performed up to three months and crack sealing was visually inspected, and quantified via image analysis procedures, monthly. Optimum dosages of each cement substitute/addition were quantified, also considering, besides the healing capacity, also the fresh state performance and compressive strength development. The good performance of mixes with crystalline admixture even under open air exposure, as well as of other investigated mixes as above with reference to crack openings and exposure conditions, paves the way to revise the significance of a serviceability design parameter such as the maximum allowable crack width as a function of the exposure with the concept of a sealable crack width.

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“…In the first mechanism, the variable h s is defined by a large value at one single point of the material. This mechanism can be found in reality for example in the case of microcapsules-based self-healing concrete [4,168,169]. In this case, when only one single crack appears in the material and is healed further due to self-healing, the strengthening of this material due to super healing material should take one large single value of h s that enhances the stiffness of the material in the area of the single crack.…”

Section: Super Healing Theorymentioning

confidence: 97%

Continuum Damage-Healing and Super Healing Mechanics in Brittle Materials: A State-of-the-Art Review

Oucif

Mauludin

2018

Applied Sciences

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Over the last several years, self-healing materials have become more and more popular in terms of damage reparation. Moreover, a recent theoretical investigation of super healing materials that aims at repairing and strengthening itself was also developed. This research area is well known by the rich experimental studies compared to the numerical investigations. This paper provides a review of the literature of continuum damage-healing and super healing mechanics of brittle materials based on continuum damage and healing mechanics. This review includes various damage-healing models, methodologies, hypotheses and advances in continuum damage and healing mechanics. The anisotropic formulations of damage and healing mechanics are also highlighted. The objective of this paper is also to review the super healing theory based on continuum damage-healing mechanics and its role in material and structure strengthening. Finally, a conclusion of the reviewed damage-healing models is pointed out and future perspectives are given.

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Performance recovery concerning the permeability of concrete by means of a microcapsule based self-healing system

Cited by 140 publications

References 38 publications

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

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

Crack sealing capacity in chloride-rich environments of mortars containing different cement substitutes and crystalline admixtures

Continuum Damage-Healing and Super Healing Mechanics in Brittle Materials: A State-of-the-Art Review

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