Preparation and properties of cement mortar/ metal hydroxide microcapsules composites

Zuo, Jianhong; Li, Huabing; Zhan, Jia; Dong, Biqin; Wang, Lei; Chen, Dazhu

doi:10.1016/j.cemconcomp.2019.103438

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…Self-healing concrete materials with bionic characteristics have been developed as a potential solution to this problem. Among them, microencapsulated self-healing composites have garnered a great deal of research attention in regards to cement-based materials [5][6][7][8].…”

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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“…Here, an active substance is usually in a carrier, and the active substance is slowly released with time. There are many carriers to be chosen for different purposes, such as super-absorbent polymers (SAP) [11][12][13], microcapsules [14][15][16], and porous nanomaterials [17][18][19]. Among these, porous silica nanoparticles have been widely used in many fields due to their high specific surface area and large pore volume [20].…”

Section: Introductionmentioning

confidence: 99%

“…Slow-release technology is currently widely applied in the fields of medicine [21,22], oil [20,23], food [24][25][26], and so on. In the field of concrete, it has been applied in the performance control of cement-based materials, such as internal curing, crack self-repair [11][12][13][14][15][16], expansion control, and rust inhibition [27,28]. However, studies have rarely reported on the use of slow-release technology for the time-dependent defoaming of concrete.…”

Section: Introductionmentioning

confidence: 99%

Novel Slow-Release Defoamers for Concrete Using Porous Nanoparticles as Carriers

et al. 2022

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Excess large and unstable air bubbles can reduce the compressive strength of hardened concrete, and traditional defoamers always fail because of adsorption and encapsulation on cement with the progress of cement hydration in later stages. It is necessary to develop a novel defoamer that shows a sustained defoaming ability in fresh concrete. A novel slow-release defoamer for concrete using porous nanoparticles as carriers is reported for the first time. The porous nanoparticles/polyether defoamer composite (SiO2-Def) was prepared via sol-gel method. SiO2-Def is a spherical composite nanoparticle with a size range of 160–200 nm and a uniform pore size distribution. SiO2-Def shows a high load rate of about 16.4% and an excellent release under an alkali and salt environment. It has a weak initial defoaming ability but shows a sustained defoaming ability with time, so that it can avoid the failures of defoamers and eliminate harmful bubbles entrained during the processes of pumping and transportation. Moreover, SiO2-Def produced a higher compressive strength of the hardened cement mortars.

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“…1 Hence, many researchers have tried the development of selfhealing and/or self-sealing concrete toward extending the service life of concrete structures and reducing their repair and maintenance costs. [2][3][4][5] Recently, numerous studies have focused on enhancing the self-healing/sealing capability of cracked concrete by incorporating crystalline admixtures, 6,7 super absorbent polymers (SAPs), [8][9][10] tubular capsules, 10,11 microcapsules, [12][13][14][15] fibers, 16 bacteria, 17,18 and combinations of the aforementioned. 19,20 Of these autonomous healing agents, capsule types have a significant advantage: they can limit healing reactions around the damaged parts (i.e., cracks), and thus maintain functionality during the longterm service life of concrete.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of self-healing in concrete with micro-capsules using a combination of air-coupled surface wave and computer-vision techniques

Ahn

Kim

Gwon

et al. 2021

Structural Health Monitoring

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This study mainly aims to investigate the applicability of the combination of air-coupled surface-wave and computer-vision techniques to the evaluation of self-healing in in situ concrete members. Small-scale beam specimens were made from ordinary concrete and concretes with solid- and liquid-type capsules; the capsules were employed as self-healing agents. To monitor the crack healing progress, surface-wave tests using an air-coupled transducer and contact receivers were conducted on each specimen in uncracked, cracked, and healed conditions after 7, 14, 28, and 63 days of water immersion. Additionally, a computer-vision technique involving image binarization and registration was applied to measure high-resolution crack information. The specimens containing the micro-capsules showed superior healing performance compared to the ordinary concrete specimens. After 63 days of self-healing, the spectral energy transmission ratio increased up to about 80% of the uncracked, while the crack area decreased up to about 94% of the fully cracked. The healing rate was estimated using the change in spectral energy transmission ratio strongly correlated with that estimated using the change in crack area.

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Preparation and properties of cement mortar/ metal hydroxide microcapsules composites

Cited by 9 publications

References 26 publications

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

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

Novel Slow-Release Defoamers for Concrete Using Porous Nanoparticles as Carriers

Monitoring of self-healing in concrete with micro-capsules using a combination of air-coupled surface wave and computer-vision techniques

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