<p>The integration of self-healing concrete (SHC) within underground infrastructure presents a novel paradigm for enhancing structural resilience, durability, and long-term stability under harsh subsurface conditions. This study evaluates the potential of SHC technologies by investigating both autogenous and autonomous healing mechanisms, focusing on their efficacy in mitigating micro-crack propagation, reducing permeability, and restoring mechanical integrity in load-bearing structures. Autogenous healing, driven by continued hydration and carbonation, is supplemented by autonomous strategies employing encapsulated healing agents, such as microbial spores and mineral precursors for targeted crack remediation. A comprehensive review of recent advancements in capsule-based delivery systems, microbial induction techniques, and SHC performance in chemically aggressive environments is presented. The applicability of SHC in critical underground tunnelling and mining components such as shotcrete linings, ventilation structures, and seepage barriers is assessed, along with a discussion of key implementation challenges including cost-effectiveness, environmental sensitivity, and field-scale deployment. The findings underscore the need for standardized evaluation protocols, hybrid healing strategies, and in-situ performance monitoring systems to support the integration of SHC in underground operations.</p>

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A Comprehensive Review on Application of Self-Healing Concrete in Enhancing Durability and Structural Integrity of Underground Structures

  • Sanjoy Gorain,
  • Ashok Kumar

摘要

The integration of self-healing concrete (SHC) within underground infrastructure presents a novel paradigm for enhancing structural resilience, durability, and long-term stability under harsh subsurface conditions. This study evaluates the potential of SHC technologies by investigating both autogenous and autonomous healing mechanisms, focusing on their efficacy in mitigating micro-crack propagation, reducing permeability, and restoring mechanical integrity in load-bearing structures. Autogenous healing, driven by continued hydration and carbonation, is supplemented by autonomous strategies employing encapsulated healing agents, such as microbial spores and mineral precursors for targeted crack remediation. A comprehensive review of recent advancements in capsule-based delivery systems, microbial induction techniques, and SHC performance in chemically aggressive environments is presented. The applicability of SHC in critical underground tunnelling and mining components such as shotcrete linings, ventilation structures, and seepage barriers is assessed, along with a discussion of key implementation challenges including cost-effectiveness, environmental sensitivity, and field-scale deployment. The findings underscore the need for standardized evaluation protocols, hybrid healing strategies, and in-situ performance monitoring systems to support the integration of SHC in underground operations.