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<p>This work investigates the mechanical behavior of grout reinforced with steel wool microfibers under dynamic compressive loading. Four fiber volume fractions (FVFs), i.e., 0.0, 0.5, 1.0, and 1.5%, were incorporated into the grout mixture to assess their influences on compressive strength, ultimate strain, and energy absorption capacity. Dynamic testing was conducted using a split Hopkinson pressure (Kolsky) bar equipped with precisely designed pulse shapers to achieve constant strain rate deformation and dynamic stress equilibrium. Meanwhile, quasi-static tests were performed to evaluate the influence of FVFs on the dynamic increase factor (DIF). To investigate failure probabilities and repeatability, the experimental results were analyzed using the two-parameter Weibull distribution function. Furthermore, an integrated multi-attribute decision-making (MADM) approach, combining the Analytic Hierarchy Process (AHP) and the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS), was employed to determine the optimal FVF for enhancing the grout performance. By systematically investigating the relationships between fiber content, dynamic compressive response, statistical reliability, and multi-criteria optimization, this study establishes an evidence-based framework to determine the optimal steel FVF. The results highlighted the importance of optimizing steel FVF to enhance the dynamic performance of grout. According to the AHP-TOPSIS analysis, the grout-FVF0.5 specimen, which incorporates 0.5% FVF, revealed the most optimum compressive performance under high strain-rate loading conditions.</p>

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Dynamic compressive behavior of steel microfiber-reinforced grout: experimental investigation and statistical optimization

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月18日

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  • Mahmoud M. Awd Allah,
  • Mohamed A. Abbas,
  • Brett A. Williams,
  • William F. Heard,
  • Xu Nie

摘要

This work investigates the mechanical behavior of grout reinforced with steel wool microfibers under dynamic compressive loading. Four fiber volume fractions (FVFs), i.e., 0.0, 0.5, 1.0, and 1.5%, were incorporated into the grout mixture to assess their influences on compressive strength, ultimate strain, and energy absorption capacity. Dynamic testing was conducted using a split Hopkinson pressure (Kolsky) bar equipped with precisely designed pulse shapers to achieve constant strain rate deformation and dynamic stress equilibrium. Meanwhile, quasi-static tests were performed to evaluate the influence of FVFs on the dynamic increase factor (DIF). To investigate failure probabilities and repeatability, the experimental results were analyzed using the two-parameter Weibull distribution function. Furthermore, an integrated multi-attribute decision-making (MADM) approach, combining the Analytic Hierarchy Process (AHP) and the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS), was employed to determine the optimal FVF for enhancing the grout performance. By systematically investigating the relationships between fiber content, dynamic compressive response, statistical reliability, and multi-criteria optimization, this study establishes an evidence-based framework to determine the optimal steel FVF. The results highlighted the importance of optimizing steel FVF to enhance the dynamic performance of grout. According to the AHP-TOPSIS analysis, the grout-FVF0.5 specimen, which incorporates 0.5% FVF, revealed the most optimum compressive performance under high strain-rate loading conditions.