Experimental Study on Cementitious Composites Embedded with Organic Microcapsules

Wang, Xianfeng; Xing, Feng; Zhang, Ming; Han, Ningxu; Qian, Zhiwei

doi:10.3390/ma6094064

Cited by 121 publications

(59 citation statements)

References 23 publications

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“…Yet although the microcapsules are likely to “attract” propagating cracks, experimental observations have shown that matrix–microcapsule interaction/bonding can determine the fracture mechanism, namely, whether it is crack deflection, interface debonding, or microcapsule fracture. Thus, improving the bond between the microcapsules and cementitious matrix at the interface is an important topic of research to improve the efficiency of the mechanical triggering mechanism . Surface modification on phenol formaldehyde and acrylates has recently been proposed to alter the hydrophilicity of the shell and thus enhance chemical compatibility and bond strength between matrix and microcapsules.…”

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

523

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

523

278

View full text Add to dashboard Cite

show abstract

“…The small margin of error observed is also an indirect indication of the uniform distribution of the microcapsules within the cement matrix. The decrease in compressive strength is mainly due to the much lower stiffness of the microcapsules compared to the cement matrix [42,43]. Hence the microcapsules formed weaker spots becoming defects in the cement matrix, leading to a decrease in strength.…”

Section: Effect Of Microcapsules On Compressive Strength Of the Oil Wmentioning

confidence: 99%

Development and Application of Novel Sodium Silicate Microcapsule-Based Self-Healing Oil Well Cement

2020

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A majority of well integrity problems originate from cracks of oil well cement. To address the crack issues, bespoke sodium silicate microcapsules were used in this study for introducing autonomous crack healing ability to oil well cement under high-temperature service conditions at 80 °C. Two types of sodium silicate microcapsule, which differed in their polyurea shell properties, were first evaluated on their suitability for use under the high temperature of 80 °C in the wellbore. Both types of microcapsules showed good thermal stability and survivability during mixing. The microcapsules with a more rigid shell were chosen over microcapsule with a more rubbery shell for further tests on the self-healing efficiency since the former had much less negative effect on the oil well cement strength. It was found that oil well cement itself showed very little healing capability when cured at 80 °C, but the addition of the microcapsules significantly promoted its self-healing performance. After healing for 7 days at 80 °C, the microcapsule-containing cement pastes achieved crack depth reduction up to ~58%, sorptivity coefficient reduction up to ~76%, and flexural strength regain up to ~27%. The microstructure analysis further confirmed the stability of microcapsules and their self-healing reactions upon cracking in the high temperature oil well cement system. These results provide a promising perspective for the development of self-healing microcapsule-based oil well cements.

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“…First, the target of selfhealing capsules is not the structure's matrix, but its surface. Second, materials that have self-healing capabilities can be applied to organic chemical products [8,9]. The number of capsules available for self-healing is limited, because they are normally utilized as coatings to protect the concrete surface, which impedes the healing of deep cracks.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Manufacturing Properties of Crack Self-Healing Capsules Using Cement Powder for Addition to Cement Composites

Choi

2017

Advances in Materials Science and Engineering

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We fabricated crack self-healing capsules using cement powder for mixing into cement composites and evaluated the properties of the capsule manufacturing process in this study. The manufacture of the self-healing capsules is divided into core production processing of granulating cement in powder form and a coating process for creating a wall on the surfaces of the granulated cement particles. The produced capsules contain unhardened cement and can be mixed directly with the cement composite materials because they are protected from moisture by the wall material. Therefore, the untreated cement is present in the form of a capsule within the cement composite, and hydration can be induced by moisture penetrating the crack surface in the event of cracking. In the process of granulating the cement, it is important to obtain a suitable consistency through the kneading agent and to maintain the moisture barrier performance of the wall material. We can utilize the results of this study as a basis for advanced self-healing capsule technology for cement composites.

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Experimental Study on Cementitious Composites Embedded with Organic Microcapsules

Cited by 121 publications

References 23 publications

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

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

Development and Application of Novel Sodium Silicate Microcapsule-Based Self-Healing Oil Well Cement

A Study on the Manufacturing Properties of Crack Self-Healing Capsules Using Cement Powder for Addition to Cement Composites

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