Abstract
We fabricated crack self-healing capsules using cement powder for mixing into cement composites and evaluated the properties of the capsule manufacturing process in this study. The manufacture of the self-healing capsules is divided into core production processing of granulating cement in powder form and a coating process for creating a wall on the surfaces of the granulated cement particles. The produced capsules contain unhardened cement and can be mixed directly with the cement composite materials because they are protected from moisture by the wall material. Therefore, the untreated cement is present in the form of a capsule within the cement composite, and hydration can be induced by moisture penetrating the crack surface in the event of cracking. In the process of granulating the cement, it is important to obtain a suitable consistency through the kneading agent and to maintain the moisture barrier performance of the wall material. We can utilize the results of this study as a basis for advanced self-healing capsule technology for cement composites.
Highlights
Smart structures and intelligent materials have emerged as new trends for reducing cracks in concrete, and extensive research is being performed on the self-healing of concrete cracks
SHCs are produced by creating the core material followed by coating
As part of the basic research required to develop cementitious composites with self-healing capabilities, this study fabricated self-healing capsules with cement powders that exhibit the same properties as cementitious composites used for construction and added them to cementitious composites during the mixing stage
Summary
Smart structures and intelligent materials have emerged as new trends for reducing cracks in concrete, and extensive research is being performed on the self-healing of concrete cracks. Among the various methods enabling self-healing, one approach is to encapsulate materials that have self-healing capabilities and introduce them as admixtures in concrete. Such capsules can hold large amounts of self-healing materials [3, 4] and reactions can be selectively induced at cracks. Self-healing materials and catalysts were encapsulated as microsized capsules [5, 6]. Materials that have self-healing capabilities can be applied to organic chemical products [8, 9]. Because most of the structure’s matrix comprises inorganic composites, the self-healing performance can be enhanced by using inorganic materials with similar thermal properties instead of organic materials with varied thermal properties. The self-healing performance can be maximized by introducing more self-healing capsules
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