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<p>The incorporation of steel fibers into concrete reduces its brittleness and enhances its energy absorption capacity through the bridging effect, thereby improving its overall mechanical performance. However, the characteristics of macro polypropylene fibers differ from those of steel fibers in several aspects, including material properties, cross-sectional geometry, and tensile strength. Consequently, the influence of macro polypropylene fibers on the mechanical behavior of concrete can differ significantly from that of steel fibers. Therefore, this study examined the effects of fiber content, stress level, and loading frequency on the flexural behavior of high-performance macro polypropylene fiber-reinforced concrete (HMPFRC) under both static and cyclic loading conditions. Fiber content was varied at three levels: 0.5%, 1.0%, and 1.5%. To evaluate fatigue performance, repeated flexural loading was applied at three stress levels—0.85, 0.75, and 0.65—and two loading frequencies: 10&#xa0;Hz and 20&#xa0;Hz. The results demonstrated that the bridging effect of macro polypropylene fibers contributed to the retention of residual load-bearing capacity following the formation of the first cracks, under both static and cyclic loading. Moreover, increasing the dosage of macro polypropylene fiber reduced the load drop and enhanced the post-cracking load-bearing capacity. A decrease in stress level led to a significant increase in fatigue life, while reducing the loading frequency from 20 to 10&#xa0;Hz resulted in a shorter fatigue life. Finally, the flexural fatigue life of HMPFRC at various reliability levels was effectively described using a two-parameter Weibull distribution.</p>

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Behavior and Models of Macro Polypropylene Fiber-Reinforced Concrete Subjected to Static and Cyclic Flexural Bending

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • My Ngoc-Tra Lam

摘要

The incorporation of steel fibers into concrete reduces its brittleness and enhances its energy absorption capacity through the bridging effect, thereby improving its overall mechanical performance. However, the characteristics of macro polypropylene fibers differ from those of steel fibers in several aspects, including material properties, cross-sectional geometry, and tensile strength. Consequently, the influence of macro polypropylene fibers on the mechanical behavior of concrete can differ significantly from that of steel fibers. Therefore, this study examined the effects of fiber content, stress level, and loading frequency on the flexural behavior of high-performance macro polypropylene fiber-reinforced concrete (HMPFRC) under both static and cyclic loading conditions. Fiber content was varied at three levels: 0.5%, 1.0%, and 1.5%. To evaluate fatigue performance, repeated flexural loading was applied at three stress levels—0.85, 0.75, and 0.65—and two loading frequencies: 10 Hz and 20 Hz. The results demonstrated that the bridging effect of macro polypropylene fibers contributed to the retention of residual load-bearing capacity following the formation of the first cracks, under both static and cyclic loading. Moreover, increasing the dosage of macro polypropylene fiber reduced the load drop and enhanced the post-cracking load-bearing capacity. A decrease in stress level led to a significant increase in fatigue life, while reducing the loading frequency from 20 to 10 Hz resulted in a shorter fatigue life. Finally, the flexural fatigue life of HMPFRC at various reliability levels was effectively described using a two-parameter Weibull distribution.