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<p>Shrinkage-induced cracking compromises concrete durability, while structural health monitoring typically requires external sensors. This study demonstrates that steel fiber–reinforced concrete (SFRC) can simultaneously mitigate shrinkage and enable intrinsic self-sensing. Sixteen beam specimens (C30 and C35) were cast with 50&#xa0;mm and 60&#xa0;mm steel fibers (SF) at dosages of 0.19%, 0.26%, 0.32%, and 0.38%. Shrinkage strain and fractional change in resistance (FCR) were monitored for 180 days and 72&#xa0;h, respectively. Results shows that 60&#xa0;mm SF at 0.38% reduced 180-day shrinkage strain by up to 38%. C30 beams with 50&#xa0;mm SF exhibited peak FCR values of 181%, whereas C35 beams with 60&#xa0;mm SF reached 128%. A strong positive correlation (R² = 0.90–0.98) was observed between FCR and shrinkage strain, confirming reliable self-sensing capability. The FCR rate of change decreased from 0.998%/h to 0.303%/h with higher SF dosage and length, indicating improved early-age stability. These findings confirm that optimized SFRC mixtures offer dual functionality which are effective in shrinkage control and real-time health monitoring, making them ideal for applications like industrial floors and tunnel linings where crack resistance and self-diagnosis are critical.</p>

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Self-sensing capabilities in steel fiber-reinforced concrete for shrinkage resistance and structural health monitoring

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月27日

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  • Masroor Ahmad,
  • Zahoor Hussain,
  • Muhammad Akbar,
  • Abasal Hussain,
  • Zhibin Lin,
  • Majed Alzara,
  • Ahmed M. Yosri

摘要

Shrinkage-induced cracking compromises concrete durability, while structural health monitoring typically requires external sensors. This study demonstrates that steel fiber–reinforced concrete (SFRC) can simultaneously mitigate shrinkage and enable intrinsic self-sensing. Sixteen beam specimens (C30 and C35) were cast with 50 mm and 60 mm steel fibers (SF) at dosages of 0.19%, 0.26%, 0.32%, and 0.38%. Shrinkage strain and fractional change in resistance (FCR) were monitored for 180 days and 72 h, respectively. Results shows that 60 mm SF at 0.38% reduced 180-day shrinkage strain by up to 38%. C30 beams with 50 mm SF exhibited peak FCR values of 181%, whereas C35 beams with 60 mm SF reached 128%. A strong positive correlation (R² = 0.90–0.98) was observed between FCR and shrinkage strain, confirming reliable self-sensing capability. The FCR rate of change decreased from 0.998%/h to 0.303%/h with higher SF dosage and length, indicating improved early-age stability. These findings confirm that optimized SFRC mixtures offer dual functionality which are effective in shrinkage control and real-time health monitoring, making them ideal for applications like industrial floors and tunnel linings where crack resistance and self-diagnosis are critical.