Abstract
Self-repairing technology based on micro-capsules is an efficient solution for repairing cracked cementitious composites. Self-repairing based on microcapsules begins with the occurrence of cracks and develops by releasing self-repairing factors in the cracks located in concrete. Based on previous comprehensive studies, this paper provides an overview of various repairing factors and investigative methodologies. There has recently been a lack of consensus on the most efficient criteria for assessing self-repairing based on microcapsules and the smart solutions for improving capsule survival ratios during mixing. The most commonly utilized self-repairing efficiency assessment indicators are mechanical resistance and durability. On the other hand, Nondestructive methods have been widely used to visualize and assess cementitious composites, self-repairing behavior. However, certain issues remain, such as crack spread behavior, repairing agent kinetics on discrete crack surfaces, and the influence of inserted capsules on the mechanical characteristics of self-repaired cementitious composites, all of which require more investigations.
Highlights
The most important and widely used building material is concrete due to its excellent serviceability, raw material availability, and compressive resistance (Mehta, 1986)
Most of the repairing factors, in self-repairing which based on microcapsules concrete, are polymer materials (Dry, et al, 2003), (Joseph, et al, 2010), (Van, et al, 2011), (Feiteira, et al, 2016), (Van, et al, 2016), which have the potential capacity for crack repairing, like quick polymerisation (White, et al, 2001), stress transfer capability (Dry, et al, 2003), and low viscosity (Feiteira, et al, 2016)
When Na2SiO3 solution interacts with Ca(OH)2 in cementitious materials, calcium-silicate hydrate (CSH) gels are formed to repairing cracks
Summary
The most important and widely used building material is concrete due to its excellent serviceability, raw material availability, and compressive resistance (Mehta, 1986). Self-repairing which is based on micro-capsules for cement pozzolana binding materials was discovered from the investigation presented by White & co-worker (White, et al, 2001) They suggested a type of crack-self-repairing element with integrated microencapsulation. These capsules are positioned perpendicular to the pre-crack in the test, and they're generally close together with other capsules containing water or accelerator to see how additives affect the self-healing process (Feiteira, et al, 2016). The quick rupturing of previously placed capsules, the penetration of repairing factors into the crack area, and the subsequent sufficient cure responses are critical to the repairing concept of self-repairing based on microcapsules concrete (Gilabert, et al, 2017) As a result, these three subprocesses must be triggered as soon as possible to ensure high-efficiency self-repairing (Kessler, et al 2003). The purpose of this review is to go through several aspects that affect the effectiveness of self-repairing based on microcapsules concrete
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