Influencing Factors on the Healing Performance of Microcapsule Self-Healing Concrete

Wang, Yanju; Lin, Zhiyang; Tang, Can; Hao, Wenfeng

doi:10.3390/ma14154139

Cited by 22 publications

(7 citation statements)

References 33 publications

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“…The wall also must have sufficient strength to prevent the core material from flowing out in advance of concrete preparation, but not excessive strength so that the microcapsule is not damaged when the concrete cracks. The bond strength between the capsule wall and the concrete also must exceed that between the capsule wall and the core material to avoid cracks in the excessive area between them and to maintain consistency with the mechanism of the microcapsule self-healing concrete [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical Properties of Microcapsule-Based Self-Healing Cementitious Composites

et al. 2021

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Self-healing concrete designs can protect against deterioration and improve durability. However, there is no unified conclusion regarding the effective preparation and mechanical properties of self-healing concrete. In this paper, microcapsules are used in cement-based materials, the reasonable dosage of microcapsules is determined, and the self-healing performance of the microcapsule self-healing system under different curing agents is explored. The microcapsules and curing agent are shown to enhance the flexural and compressive strength of mortar specimens at relatively low contents. The optimal microcapsule content in terms of compressive strength is 1–3%. When the content of the microcapsule reaches 7%, the strength of the specimen decreases by approximately 30%. Sodium fluorosilicate is better-suited to the microcapsule self-healing cement-based system than the other two fluorosilicates, potassium fluorosilicate and magnesium, which have similarly poor healing performance as curing agents. Healing time also appears to significantly influence the microcapsule self-healing system; mortar specimens that healed for 28 days are significantly higher than those that healed for 7 days. This work may provide a valuable reference for the design and preparation of self-healing cementitious composite structures.

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Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical Properties of Microcapsule-Based Self-Healing Cementitious Composites

et al. 2021

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“…The ethyl cellulose solution was sprayed on the capsule core material with a syringe and dried by blast to obtain the finished microcapsules. Parameters such as the mix ratio of microcapsule core materials and microcapsule wall materials can be found in [29,30]. Finally, microcapsules with particle size of 1-1.2 mm were selected, as shown in Fig.…”

Section: Experimental Details 21 Sample Preparationmentioning

confidence: 99%

Evaluation of Self-Healing Efficiency of Microcapsule-Based Self-Healing Cementitious Composites Based on Acoustic Emission

Hao¹,

Hao²,

Kanwal³

et al. 2023

Journal of Renewable Materials

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Microcapsule self-healing technology is one of the effective methods to solve the durability problem of cementbased composites. The evaluation method of the self-healing efficiency of microcapsule self-healing cement-based composites is one of the difficulties that limits the self-healing technology. This paper attempts to characterize the self-healing efficiency of microcapsule self-healing cement-based composites by acoustic emission (AE) parameters, which provides a reference for the evaluation of microcapsule self-healing technology. Firstly, a kind of self-healing microcapsules were prepared, and the microcapsules were added into the cement-based composites to prepare the compression samples. Then, the specimen with certain pre damage was obtained by compression test. Secondly, the damaged samples were divided into two groups. One group was directly used for compression tests to obtain the damage failure process. The other group was put into water for healing for 30 days, and then compression tests were carried out to study the influence of self-healing on the compression failure process. During the experiments, the AE signals were collected and the AE characteristics were extracted for the evaluation of self-healing efficiency. The results show that the compression pre damage test can trigger the microcapsule, and the compression strength of the self-healing sample is improved. The failure mechanism of microcapsule selfhealing cement-based composites can be revealed by the AE parameters during compression, and the self-healing efficiency can be quantitatively characterized by AE hits. The research results of this paper provide experimental reference and technical support for the mechanical property test and healing efficiency evaluation of microcapsule self-healing cement-based composites.

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“…There are many new methods for improving the impregnation effect. The absorption rate was significantly improved under vacuum conditions compared with immersion under atmospheric conditions [ 59 ]. Coarse LWAs with high porosity were usually adopted.…”

Section: Components and Mechanisms Of Lightweight Aggregate Self-heal...mentioning

confidence: 99%

A Review of Lightweight Self-Healing Concrete

Feng

Zhou

2022

Materials

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Cementitious composites often crack because of their low tensile strength. The ability of self-healing cementitious composite to automatically repair cracks has attracted widespread attention. Lightweight aggregate (LWA) has a low density and a high porosity which can provide storage space for a healing agent. The healing mechanisms and healing compositions of lightweight self-healing concrete (LWSHC) have been summarized in this research. The workability, compressive strength, crack repairing, and durability of LWSHC performance is also illustrated. A LWA with interconnected pores and a high strength should be integrated into LWSHC to increase the crack closure rate and mechanical properties. Expanded perlite is the most suitable LWA carrier for bioremediation. The chemical healing agents are better than the biological healing agents at present since the biological healing agents have more negative effects. A sodium silicate solution is a good choice as a chemical healing agent. Vacuum conditions, high-temperature processing, and the use of coating technologies on LWAs can improve the healing effect of LWSHC. The addition of fibers also enhance the self-healing ability of LWSHC. Further, the use of numerical simulation supports the healing performance of LWSHC. The goal of this research is to investigate the most appropriate component of LWSHC to ensure a high crack closure rate, strength healing ratio, and great durability while being lightweight. It can then be adopted in high-rise and large-span concrete structures to extend the service life.

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Influencing Factors on the Healing Performance of Microcapsule Self-Healing Concrete

Cited by 22 publications

References 33 publications

Preparation and Mechanical Properties of Microcapsule-Based Self-Healing Cementitious Composites

Preparation and Mechanical Properties of Microcapsule-Based Self-Healing Cementitious Composites

Evaluation of Self-Healing Efficiency of Microcapsule-Based Self-Healing Cementitious Composites Based on Acoustic Emission

A Review of Lightweight Self-Healing Concrete

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