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<p>Compression casting improves the compressive strength of concrete but also increases brittleness, limiting its structural applications. This study investigates the static and dynamic mechanical behavior of compression-cast steel fiber-reinforced concrete (CCSFRC) and develops predictive models for its performance. Static and dynamic stress–strain (σ–ε) tests were conducted on four CCSFRC mixes, with normal-cast SFRC as controls, to evaluate the effects of casting method and steel fiber content. Unified constitutive models incorporating these parameters were developed, and flexural stress block analysis was performed to validate reinforced concrete beam capacity. Results show that compression casting increased compressive strength and elastic modulus by up to 66.04% and 70.86%, respectively, while producing a steeper descending branch indicative of higher brittleness. Under dynamic loading at 0.5&#xa0;MPa impact intensity, CCSFRC exhibited 61.84% and 63.30% increases in dynamic elastic modulus and compressive strength, with peak stress rising by 59.64–134.80% due to strain-rate effects. Steel fiber addition enhanced ductility, increasing ultimate strain by 53% (static) and 16.8% (dynamic). The proposed constitutive models achieved high predictive accuracy (R<sup>2</sup> = 0.92), and flexural stress block parameters predicted beam capacity with less than 5% error. This study demonstrates that combining compression casting with steel fiber reinforcement effectively mitigates brittleness while enhancing strain-rate resistance, providing practical tools for designing resilient, impact-resistant, and sustainable concrete structures.</p>

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Mechanical behavior, stress–strain modeling, and structural validation of compression-cast fiber reinforced concrete under static and dynamic loading

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Di Li,
  • Syed Minhaj Saleem Kazmi,
  • Huihui Li,
  • Fang Yuan,
  • Yufei Wu

摘要

Compression casting improves the compressive strength of concrete but also increases brittleness, limiting its structural applications. This study investigates the static and dynamic mechanical behavior of compression-cast steel fiber-reinforced concrete (CCSFRC) and develops predictive models for its performance. Static and dynamic stress–strain (σ–ε) tests were conducted on four CCSFRC mixes, with normal-cast SFRC as controls, to evaluate the effects of casting method and steel fiber content. Unified constitutive models incorporating these parameters were developed, and flexural stress block analysis was performed to validate reinforced concrete beam capacity. Results show that compression casting increased compressive strength and elastic modulus by up to 66.04% and 70.86%, respectively, while producing a steeper descending branch indicative of higher brittleness. Under dynamic loading at 0.5 MPa impact intensity, CCSFRC exhibited 61.84% and 63.30% increases in dynamic elastic modulus and compressive strength, with peak stress rising by 59.64–134.80% due to strain-rate effects. Steel fiber addition enhanced ductility, increasing ultimate strain by 53% (static) and 16.8% (dynamic). The proposed constitutive models achieved high predictive accuracy (R2 = 0.92), and flexural stress block parameters predicted beam capacity with less than 5% error. This study demonstrates that combining compression casting with steel fiber reinforcement effectively mitigates brittleness while enhancing strain-rate resistance, providing practical tools for designing resilient, impact-resistant, and sustainable concrete structures.