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<p>Steel-fiber-reinforced concrete (SFRC) is widely used in tunnel engineering to endure harsh service conditions. In light of tunnel heat damage, this study examines the combined effects of curing temperature and fiber content on the mechanical response of SFRC using the Brazilian splitting test. Simultaneously, acoustic emission (AE) monitoring was employed to analyze failure mechanisms under varying curing conditions. The experimental results indicate that higher curing temperatures significantly reduce the peak strength, residual strength, apparent stiffness, and critical displacement of the specimens. In contrast, increasing the fiber content markedly improves residual strength and critical displacement, extends the crack-propagation stage, inhibits crack development, and enhances ductility, while only slightly affecting peak strength and reducing apparent stiffness. The specified curing temperature has minimal impact on the pre-peak deformation stage. AE analysis further reveals peak-frequency bands linked to different failure events, highlighting the important role of fiber content in influencing fracture behavior. Finally, a comprehensive damage constitutive model for SFRC subjected to dry-heat curing is proposed. This model accurately replicates the experimental data and describes the evolution of mechanical behavior at each loading stage, providing both a theoretical and experimental foundation for the design and performance evaluation of SFRC in high-temperature tunnel environments.</p>

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Splitting Behavior and Full-Process Damage Constitutive Modeling of Steel-Fiber-Reinforced Concrete under Dry-Heat Curing: Brazilian Test and Acoustic Emission Insights

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Mengchaofan Peng,
  • Hang Lin,
  • Ke Ou,
  • Yi Tang,
  • Jing Zhou,
  • Fenghua Nie

摘要

Steel-fiber-reinforced concrete (SFRC) is widely used in tunnel engineering to endure harsh service conditions. In light of tunnel heat damage, this study examines the combined effects of curing temperature and fiber content on the mechanical response of SFRC using the Brazilian splitting test. Simultaneously, acoustic emission (AE) monitoring was employed to analyze failure mechanisms under varying curing conditions. The experimental results indicate that higher curing temperatures significantly reduce the peak strength, residual strength, apparent stiffness, and critical displacement of the specimens. In contrast, increasing the fiber content markedly improves residual strength and critical displacement, extends the crack-propagation stage, inhibits crack development, and enhances ductility, while only slightly affecting peak strength and reducing apparent stiffness. The specified curing temperature has minimal impact on the pre-peak deformation stage. AE analysis further reveals peak-frequency bands linked to different failure events, highlighting the important role of fiber content in influencing fracture behavior. Finally, a comprehensive damage constitutive model for SFRC subjected to dry-heat curing is proposed. This model accurately replicates the experimental data and describes the evolution of mechanical behavior at each loading stage, providing both a theoretical and experimental foundation for the design and performance evaluation of SFRC in high-temperature tunnel environments.