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<p>Rock salt exhibits damage self-healing properties in humid environments. In this study, an initially damaged rock salt was conditioned in humidity cycling. Micron-scale X-ray computed tomography (CT) was employed before and after the treatment to investigate the mesoscale cracks’ kinetic process of self-healing. Under a deviatoric stress load inducing 3.83% strain, the sample’s damage was observed to be predominantly intergranular cracks, forming extensive and interconnected transfixion crack surfaces. After undergoing 240-h humidity cycling, crack structures were extensively fragmented, reducing void fraction from 3.95 to 3.25%. The fraction of connected voids also decreased from 96.4 to 81.9%, revealing a significant recovery in material continuity. Representative crack structures were tracked by comparing their three-dimensional (3D) reconstruction results from the two CT scans, indicating that self-healing was progressively achieved through forming healing salt structures to block, fragment, and spherize cracks. Three geometric parameters of crack structures, genus, component void number, and shape factor, were verified to effectively characterize these three healing stages. The progress parameter of each stage was thus designed, forming a framework to quantify the damage self-healing effects. Applying this framework to both characteristic cracks and the entire specimen, the quantified results were validated by comparing them with the scanned 3D morphology, demonstrating the reliability and general applicability of this approach.</p>

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Quantifying Damage Self-Healing Effects in Rock Salt through Micro-CT Images

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Zhen Zeng,
  • Hongling Ma,
  • Yinping Li,
  • Xuan Wang,
  • Zhuyan Zheng,
  • Jiangyu Fang,
  • Shijie Zhu,
  • Rui Liang

摘要

Rock salt exhibits damage self-healing properties in humid environments. In this study, an initially damaged rock salt was conditioned in humidity cycling. Micron-scale X-ray computed tomography (CT) was employed before and after the treatment to investigate the mesoscale cracks’ kinetic process of self-healing. Under a deviatoric stress load inducing 3.83% strain, the sample’s damage was observed to be predominantly intergranular cracks, forming extensive and interconnected transfixion crack surfaces. After undergoing 240-h humidity cycling, crack structures were extensively fragmented, reducing void fraction from 3.95 to 3.25%. The fraction of connected voids also decreased from 96.4 to 81.9%, revealing a significant recovery in material continuity. Representative crack structures were tracked by comparing their three-dimensional (3D) reconstruction results from the two CT scans, indicating that self-healing was progressively achieved through forming healing salt structures to block, fragment, and spherize cracks. Three geometric parameters of crack structures, genus, component void number, and shape factor, were verified to effectively characterize these three healing stages. The progress parameter of each stage was thus designed, forming a framework to quantify the damage self-healing effects. Applying this framework to both characteristic cracks and the entire specimen, the quantified results were validated by comparing them with the scanned 3D morphology, demonstrating the reliability and general applicability of this approach.