Critical Aspects in the Development and Integration of Encapsulated Healing Agents in Cement and Concrete

Papaioannou, Stamatoula; Amenta, Maria; Kilikoglou, Vassilis; Gournis, Dimitrios; Karatasios, Ioannis

doi:10.3151/jact.19.301

Cited by 16 publications

(3 citation statements)

References 141 publications

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“…The research so far, shows the key role of the encapsulation methodology followed for the development of the capsules, since it controls their basic characteristics. Many chemical, physical and physicochemical techniques have been studied, such as polymerization, sol gel reaction, complex coacervation, 3D printing, extrusion and pan coating [4,5]. From the above methods, pan coating is considered very promising since it provides the ability to use materials of high chemical compatibility with the matrix [6], as well as to adjust the capsules properties in order to optimize their performance [7].…”

Section: Introductionmentioning

confidence: 99%

Design and optimization parameters of cement-based spherical macrocapsules for self-healing cement applications

et al. 2023

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Encapsulated healing agents is a promising solution for extending the service life of critical infrastructure, providing long-term healing efficiency. This research focuses on the shell properties of cement-based spherical macro-capsules, aiming to achieve increased survivability during mixing of mortar mixtures and efficient triggering upon crack propagation. In this framework, the pan coating technique was examined for the production of capsules with a cementitious shell, developed for the protection of powder healing agents. The main properties that were studied included the crushing load as a function of capsules size and the shell hydration facilitated by different setting accelerators, and their consequent effect on the survivability and the triggering efficiency of the capsules. The results show that the use of setting accelerators allows the rapid densification of the shell microstructure and improves the crushing load of capsules, resulting in high survivability during mixing process. The enhanced compatibility of capsules with the matrix allowed the efficient triggering of capsules during crack propagation, initiating the autonomous healing process.

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Section: Introductionmentioning

confidence: 99%

Design and optimization parameters of cement-based spherical macrocapsules for self-healing cement applications

et al. 2023

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“…Specifically, in concrete, types of bacteria can be encapsulated for a self-healing effect [16]. The principle of self-healing materials is applied when the treated material is mechanically damaged; the encapsulate is released after a rupture of capsules and the core material is used to repair the damaged part [17][18][19]. In the same industry, the encapsulation is also used for anticorrosive coating.…”

Section: Introductionmentioning

confidence: 99%

Application of Physical-Chemical Approaches for Encapsulation of Active Substances in Pharmaceutical and Food Industries

Řepka,

Kurillová,

Murtaja

et al. 2023

Foods

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Background: Encapsulation is a valuable method used to protect active substances and enhance their physico-chemical properties. It can also be used as protection from unpleasant scents and flavors or adverse environmental conditions. Methods: In this comprehensive review, we highlight the methods commonly utilized in the food and pharmaceutical industries, along with recent applications of these methods. Results: Through an analysis of numerous articles published in the last decade, we summarize the key methods and physico-chemical properties that are frequently considered with encapsulation techniques. Conclusion: Encapsulation has demonstrated effectiveness and versatility in multiple industries, such as food, nutraceutical, and pharmaceuticals. Moreover, the selection of appropriate encapsulation methods is critical for the effective encapsulation of specific active compounds. Therefore, constant efforts are being made to develop novel encapsulation methods and coating materials for better encapsulation efficiency and to improve properties for specific use.

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“…Among various concrete healing technologies, embedment of the microcapsules encapsulated with the healing agent to manufacture the self-healing cementitious materials has been widely accepted to be one of the most efficient approaches [15][16][17]. For this method, the microcapsules containing the healing agent are mixed with the cement.…”

Section: Introductionmentioning

confidence: 99%

Performance-Based Evaluation of Healing Efficiency on Mechanical Properties of Self-Healing Cementitious Materials Incorporated with PMMA/Epoxy Microcapsule

Ren

Liu

et al. 2022

Polymers

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In this study, based upon the investigation of its effect on workability and the mechanical property of cementitious materials, the Box–Behnken design was adopted to establish models describing self-healing performance on mechanical properties of cementitious materials with polymethylmethacrylate (PMMA)/epoxy microcapsule in terms of healing rate of peak strength (Y1), the recovery rate of peak strength (Y2), the healing rate of Young’s modulus (Y3), the recovery rate of Young’s modulus (Y4), the healing rate of peak strain (Y5), and recovery rate of peak strain (Y6). This was performed under the influence of the four factors, including microcapsule size (X1), microcapsule content (X2), pre-loading (X3), and curing age (X4). The results showed the four factors significantly affect the healing rate and recovery rate of the peak strength, Young’s modulus, and peak strain, except the healing rate on peak strain. Moreover, the interaction between the factors showed some influence as well. The numerically optimised values of X1, X2, X3, and X4 are 203 nm, 5.59%, 43.56%, and 21 days, respectively, and the self-healing cementitious materials with desirable mechanical characteristics (Y1 63.67%, Y2 145.22%, Y3 40.34%, Y4 132.22%, Y5 27.66%, and Y6 133.84%) with the highest desirability of 0.9050 were obtained. Moreover, the porosity of the specimen confirmed the healing performance of PMMA/epoxy microcapsules in cementitious materials.

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Critical Aspects in the Development and Integration of Encapsulated Healing Agents in Cement and Concrete

Cited by 16 publications

References 141 publications

Design and optimization parameters of cement-based spherical macrocapsules for self-healing cement applications

Design and optimization parameters of cement-based spherical macrocapsules for self-healing cement applications

Application of Physical-Chemical Approaches for Encapsulation of Active Substances in Pharmaceutical and Food Industries

Performance-Based Evaluation of Healing Efficiency on Mechanical Properties of Self-Healing Cementitious Materials Incorporated with PMMA/Epoxy Microcapsule

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