Development of Self-Healing Concrete Incorporating Ceramic Microcapsules for Enhanced Structural Durability: A Comprehensive Review

Abstract

ABSTRACT Concrete represents the most ubiquitous construction material globally, yet its inherent vulnerability to micro-cracking under mechanical loading and environmental degradation compromises structural integrity and service life. Micro-cracks act as rapid conduits for aggressive agents—such as water, chloride ions, and sulfates—initiating steel reinforcement corrosion and matrix deterioration. Autonomous self-healing concrete has emerged as a transformative solution, with microencapsulation technology offering precise delivery of healing agents upon crack formation. While polymeric shells (e.g., urea-formaldehyde, polyurethane) have been widely investigated, their low thermal resistance, mechanical fragility during concrete mixing, and susceptibility to chemical degradation in the highly alkaline pore solution (pH 12–13) present critical barriers to long-term performance. Recently, ceramic microcapsules (utilizing silica, alumina, or aluminosilicate shells) have demonstrated exceptional promise due to their superior compressive strength, thermal stability, chemical inertness, and seamless chemical compatibility with the cementitious matrix. This paper presents a detailed review on the development, mechanical optimization, chemical encapsulation mechanisms, and durability performance of ceramic microcapsule-based self-healing concrete. Key evaluation parameters including crack width closure, water permeability reduction, compressive and flexural strength recovery, and microstructural bonding at the shell-matrix interface are critically examined. Furthermore, the review outlines current manufacturing limitations, cost efficiency challenges, and field implementation barriers, establishing a strategic roadmap for future research toward resilient, long-life sustainable concrete infrastructure.

KEYWORDS: Self-Healing Concrete; Ceramic Microcapsules; Structural Durability; Encapsulation; Crack Repair; Sodium Silicate; Microstructure; C S-H Gel.