Synthesis and integration of cement-based capsules modified with sodium silicate for developing self-healing cements

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

doi:10.1016/j.conbuildmat.2021.125803

Cited by 24 publications

(10 citation statements)

References 52 publications

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“…1, while the different water solutions, their concentration and the name of the different batches of capsules are presented in Table 1. The core particles of the capsules were prepared using white OPC sprayed with tap water as described in [7]. In this case, white OPC was used for the core particles in order to facilitate the visual separation between the core and the shell of the capsules.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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: Methodsmentioning

confidence: 99%

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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“…Cai found that adding SS increased the strength and compactness of Portland cement-based materials while reducing the pore size [19]. SS itself has the advantages of high viscosity and strength and can bond fly ash, cement, and other material particles, which will improve the strength and durability of concrete [20]. Researchers explained that the main components of rubber contain an acid carboxyl group, and the hydroxide ion in NaOH can replace the hydrogen ion on the functional group of acid, improving the bonding ability of the rubber powder-cement interface [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Durability Improvement of Pumice Lightweight Aggregate Concrete by Incorporating Modified Rubber Powder with Sodium Silicate

Wang,

Shu,

et al. 2024

Materials

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To improve the durability of pumice lightweight aggregate concrete applied in cold and drought areas, sodium silicate-modified waste tire rubber powder is used to treat the pumice lightweight aggregate concrete. The pumice lightweight aggregate concrete studied is mainly used in river lining structures. It will be eroded by water flow and the impact of ice and other injuries, resulting in reduced durability, and the addition of modified rubber will reduce the damage. The durability, including mass loss rate and relative dynamic elastic modulus of pumice lightweight aggregate concrete with different sodium silicate dosages and rubber power particle sizes, is analyzed under freeze-thaw cycles, and the microstructure is further characterized by using microscopic test methods such as nuclear magnetic resonance tests, ultra-depth 3D microscope tests, and scanning electron microscopy tests. The results showed that the durability of pumice lightweight aggregate concrete is significantly improved by the addition of modified waste tire rubber powder, and the optimum durability is achieved when using 2 wt% sodium silicate modified rubber power with a particle size of 20, and then the mass loss rate decreased from 4.54% to 0.77% and the relative dynamic elastic modulus increased from 50.34% to 64.87% after 300 freeze-thaw cycles compared with other samples. The scanning electron microscopy test result showed that the surface of rubber power is cleaner after the modification of sodium silicate, so the bonding ability between rubber power and cement hydration products is improved, which further improved the durability of concrete under the freeze-thaw cycle. The results of the nuclear magnetic resonance test showed that the pore area increased with the number of freeze-thaw cycles, and the small pores gradually evolved into large pores. The effect of sodium silicate on the modification of rubber power with different particle sizes is different. After the treatment of 2 wt% sodium silicate, the relationship between the increased rate of pore area and the number of freezing-thawing cycles is 23.8/times for the pumice lightweight aggregate concrete containing rubber power with a particle size of 20 and 35.3/times for the pumice lightweight aggregate concrete containing a particle size of 80 rubber power, respectively.

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“…Even if the technology of cement seems quite well established, recent discoveries in nanotechnology and materials science (e.g., the discovery of graphene) opened the possibility of inducing novel smart functionalities in cement and concrete, allowing their use in advanced technological applications. Examples of such systems are self-healing systems [7,8], health-monitoring systems [9,10], conductive materials [11], water permeable materials [12], thermal energy storage materials [13], rubberized concrete [14][15][16][17], and sustainable composites containing bio-based fillers [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

An Insight into the Chemistry of Cement—A Review

Lavagna

Nisticò

2022

Applied Sciences

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Even if cement is a well-consolidated material, the chemistry of cement (and the chemistry inside cement) remains very complex and still non-obvious. What is sure is that the hydration mechanism plays a pivotal role in the development of cements with specific final chemical compositions, mechanical properties, and porosities. This document provides a survey of the chemistry behind such inorganic material. The text has been organized into five parts describing: (i) the manufacture process of Portland cement, (ii) the chemical composition and hydration reactions involving a Portland cement, (iii) the mechanisms of setting, (iv) the classification of the different types of porosities available in a cement, with particular attention given to the role of water in driving the formation of pores, and (v) the recent findings on the use of recycled waste materials in cementitious matrices, with a particular focus on the sustainable development of cementitious formulations. From this study, the influence of water on the main relevant chemical transformations occurring in cement clearly emerged, with the formation of specific intermediates/products that might affect the final chemical composition of cements. Within the text, a clear distinction between setting and hardening has been provided. The physical/structural role of water in influencing the porosities in cements has been analyzed, making a correlation between types of bound water and porosities. Lastly, some considerations on the recent trends in the sustainable reuse of waste materials to form “green” cementitious composites has been discussed and future considerations proposed.

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Synthesis and integration of cement-based capsules modified with sodium silicate for developing self-healing cements

Cited by 24 publications

References 52 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

Durability Improvement of Pumice Lightweight Aggregate Concrete by Incorporating Modified Rubber Powder with Sodium Silicate

An Insight into the Chemistry of Cement—A Review

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