Poly(methyl methacrylate) capsules as an alternative to the ‘’proof-of-concept’’ glass capsules used in self-healing concrete

Araújo, Maria Adelaide Pereira Gomes de; Chatrabhuti, Sutima; Gurdebeke, Stijn; Alderete, Natalia Mariel; Tittelboom, Kim Van; Raquez, Jean-Marie; Cnudde, Veerle; Vlierberghe, Sandra Van; Belie, Nele De; Gruyaert, Elke

doi:10.1016/j.cemconcomp.2018.02.015

Cited by 78 publications

(53 citation statements)

References 26 publications

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“…PMMA_2, PS, PLA and PMMA_1‐PEG capsules broke for very large cracks only. Subsequent real‐scale tests revealed that the resistance of cracked concrete against chloride could be increased for concrete with mixed‐in PMMA or glass capsules filled with water repellent agent . Glass capsules provided better crack sealing compared to PMMA capsules as a result of the more uniform distribution in the concrete beam, while the PMMA capsules tended to float.…”

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

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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

Self Cite

523

278

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show abstract

“…Since the survival of those external capsules during the vigorous mixing process and also, during casting procedures is critical for this capsule-based methodology, researchers also developed new evaluation techniques for self-healing efficiency. Araujo et al extruded microscale poly(methyl methacrylate) capsules with the width less than a millimeter using a single screw extruder (Araujo et al, 2018). The authors encapsulated an accelerating agent inside those PMMA capsules and backtracked the number of capsules broken during the mixing process by quantifying the accelerating effect observed during the setting process.…”

Section: Capsule-based Approachmentioning

confidence: 99%

Bioinspired Cementitious Materials: Main Strategies, Progress, and Applications

Shahsavari

Hwang

2020

Front. Mater.

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Nature-inspired ensemble of organic and inorganic constituents, such as that found in the microstructure of nacre and dactyl clubs of Mantis shrimp, has evolved into the model system for the structural design of industrial composites. This novel design concept, which helps attaining the balance between strength, toughness and ductility, has not only induced a paradigm shift in the synthesis of advanced materials such as graphene-based composites but also, in the development of more abundant, low-cost materials such as cement and concretes. The advance in synthetic techniques and the advent of new manufacturing technologies such as 3D printing has enabled effective integration of cementitious materials with soft materials across various length scales. Furthermore, novel functional properties such as self-healing have also been materialized based on a variety of strategies. This review will provide the comprehensive overview on the ongoing research efforts, encompassing 3D printing, self-healing strategies and integration of C-S-H with organic components, all of which are actively exploited in synthesizing bioinspired, multifunctional cementitious materials.

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“…Araujo et al [27] carried out real-scale tests on concrete beams of 2.5 m x 0.40 m x 0.20 m reinforced with four ribbed steel bars (Ø=10 mm). Poly(methyl methacrylate) and glass capsules were used to encapsulate the healing agent.…”

Section: Chloride Ingress In Real-scale Specimensmentioning

confidence: 99%

Durability of self-healing concrete

et al. 2019

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Application of self-healing concrete reduces the need for expensive maintenance and repair actions. However, the durability of self-healing concrete has only been scarcely investigated. Here, recent results are presented regarding the resistance of self-healing concrete to chloride ingress. For self-healing concrete with macro-encapsulated polyurethane, chloride profiles and electron probe microanalysis indicated that this mechanism was efficient to reduce the chloride penetration into the crack and from the crack into the concrete matrix [1]. Furthermore, the corrosion behaviour of reinforced concrete specimens subjected to cyclic exposure with a NaCl solution was studied [2]. The electrochemical measurements indicated that autonomous crack healing could significantly reduce the corrosion in the propagation stage. No visual damage could be detected on the rebars after 44 weeks of exposure. On the contrary, cracked specimens without integrated self-healing mechanism, reached a state of active corrosion after 10 weeks of exposure and after 26 weeks clear pitting damage was observed on the rebars. While self-healing by encapsulated polyurethane is complete after one day, bacteria-based products take several weeks to heal a 300 µm crack. Bacterial granules containing denitrifying cultures released nitrite as an intermediate metabolic product which protected the reinforcement during the crack healing process [3].

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Poly(methyl methacrylate) capsules as an alternative to the ‘’proof-of-concept’’ glass capsules used in self-healing concrete

Cited by 78 publications

References 26 publications

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

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

Bioinspired Cementitious Materials: Main Strategies, Progress, and Applications

Durability of self-healing concrete

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