Scholarlink

<p>Cracks are a critical factor limiting the durability of concrete, particularly in reinforced structures where they accelerate corrosion and compromise structural integrity. While surface cracks are detectable via manual inspection, internal cracks are insidious and difficult to ascertain without specialized equipment, posing significant safety hazards. This study investigates the non-invasive Shear Horizontal (SH) ultrasonic imaging method for the precise reconstruction of internal defects. This technique facilitates rapid, high-precision imaging of internal structures, avoiding the damage associated with core drilling. Large-scale concrete specimens containing self-healing agents were prepared, and through-cracks were induced followed by wet-dry cycling curing. During the healing process, ultrasonic data were acquired using an ultrasonic phased array scanner (A1040 MIRA). The Synthetic Aperture Focusing Technique (SAFT) and Full Waveform Inversion (FWI) were employed to visualize the temporal evolution of crack healing. Furthermore, the distribution of repair products was statistically analyzed and corroborated by microscopic characterizations, including XRD, SEM, EDS, FTIR, and TG-DTG. Results indicate that cracks with widths &lt; 0.5&#xa0;mm achieved complete closure within 3 days. For larger cracks, FWI analysis quantified a 48.2% reduction in the effective crack area (from 199.9&#xa0;cm² to 103.6&#xa0;cm²). These findings validate the reliability of FWI for monitoring self-healing processes in large-scale concrete structures.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on real time and non-destructive visual monitoring of cement-based materials crack self-healing process based on array-type ultrasonic

  • 期刊论文

  • 发表日期：

    2026年2月22日

查看全文
  • J. J. Yang,
  • Q. W. Zhan,
  • X. Zhang,
  • C. H. Fu,
  • R. Y. Chen,
  • Z. H. H. Pan

摘要

Cracks are a critical factor limiting the durability of concrete, particularly in reinforced structures where they accelerate corrosion and compromise structural integrity. While surface cracks are detectable via manual inspection, internal cracks are insidious and difficult to ascertain without specialized equipment, posing significant safety hazards. This study investigates the non-invasive Shear Horizontal (SH) ultrasonic imaging method for the precise reconstruction of internal defects. This technique facilitates rapid, high-precision imaging of internal structures, avoiding the damage associated with core drilling. Large-scale concrete specimens containing self-healing agents were prepared, and through-cracks were induced followed by wet-dry cycling curing. During the healing process, ultrasonic data were acquired using an ultrasonic phased array scanner (A1040 MIRA). The Synthetic Aperture Focusing Technique (SAFT) and Full Waveform Inversion (FWI) were employed to visualize the temporal evolution of crack healing. Furthermore, the distribution of repair products was statistically analyzed and corroborated by microscopic characterizations, including XRD, SEM, EDS, FTIR, and TG-DTG. Results indicate that cracks with widths < 0.5 mm achieved complete closure within 3 days. For larger cracks, FWI analysis quantified a 48.2% reduction in the effective crack area (from 199.9 cm² to 103.6 cm²). These findings validate the reliability of FWI for monitoring self-healing processes in large-scale concrete structures.