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<p>This study examines the dual role of steel fiber-reinforced concrete (SFRC) in enhancing both mechanical performance and electromagnetic interference (EMI) shielding in critical infrastructure such as data centers, power stations, and hospitals. A total of 24 cubes (150 × 150 × 150&#xa0;mm), 8 beams (150 × 300 × 2000&#xa0;mm), and 6 panels (344 × 344 × 50&#xa0;mm) were cast with steel fiber dosages of 0%, 0.5%, 0.75%, and 1.0% by volume. At 28 days, 0.75% fiber achieved the highest compressive strength (39.6&#xa0;MPa), a 46% increase over the control (27.0&#xa0;MPa). Under bending, beams with 1.0% fiber reached the highest flexural strength (23.0&#xa0;MPa), 10–12% above control specimens. EMI shielding effectiveness, measured over 0.01–300&#xa0;MHz (MIL-STD-188-125-1), peaked at 87.57 dB for specimens with 1.0% fiber and a 100&#xa0;mm-spaced rebar grid, versus 65.6 dB for plain concrete; without rebar, 1.0% fiber still achieved 80.19 dB. Results demonstrate that higher fiber content significantly enhances both mechanical and EMI shielding properties. This work is among the first to quantify the combined effects of fiber dosage and rebar integration, providing a practical basis for designing multifunctional concrete designs that improve the resilience and protection of essential facilities.</p>

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Impact of steel fiber content on mechanical properties and EMI shielding of concrete structures

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Waleed Abd-Allah,
  • Omar A. Arafa,
  • G. M. Abdo,
  • Ahmed H. Ali,
  • Ahmed Gouda

摘要

This study examines the dual role of steel fiber-reinforced concrete (SFRC) in enhancing both mechanical performance and electromagnetic interference (EMI) shielding in critical infrastructure such as data centers, power stations, and hospitals. A total of 24 cubes (150 × 150 × 150 mm), 8 beams (150 × 300 × 2000 mm), and 6 panels (344 × 344 × 50 mm) were cast with steel fiber dosages of 0%, 0.5%, 0.75%, and 1.0% by volume. At 28 days, 0.75% fiber achieved the highest compressive strength (39.6 MPa), a 46% increase over the control (27.0 MPa). Under bending, beams with 1.0% fiber reached the highest flexural strength (23.0 MPa), 10–12% above control specimens. EMI shielding effectiveness, measured over 0.01–300 MHz (MIL-STD-188-125-1), peaked at 87.57 dB for specimens with 1.0% fiber and a 100 mm-spaced rebar grid, versus 65.6 dB for plain concrete; without rebar, 1.0% fiber still achieved 80.19 dB. Results demonstrate that higher fiber content significantly enhances both mechanical and EMI shielding properties. This work is among the first to quantify the combined effects of fiber dosage and rebar integration, providing a practical basis for designing multifunctional concrete designs that improve the resilience and protection of essential facilities.