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<p>This study explores the synergistic reinforcing effects of polypropylene fiber (PPF) and nano-silica (NS) on the performance of aeolian sand concrete (ASC). A modified aeolian sand concrete (NPAC) incorporating various dosages of NS and PPF was prepared to investigate the influence of NS mass fraction and PPF volume fraction on its mechanical properties, salt frost resistance, and microstructural characteristics. Results indicate that the specimen incorporating 2.4% NS and 0.75% PPF by volume (designated as NS-3-C) exhibited superior mechanical strength and durability under salt freeze–thaw conditions. Specifically, NS contributed to matrix densification and strength enhancement, while PPF improved the post-peak ductility and strain capacity. The combined action of NS and PPF led to a significant improvement in overall performance. Compared to unmodified ASC, the NS-3-C showed increases in compressive strength, flexural strength, and splitting tensile strength of 4.77, 11.81, and 18.77%, respectively. Moreover, the incorporation of 0.75% PPF resulted in a 17.45% increase in peak strain relative to the counterpart without fibers. The proposed constitutive model exhibits excellent agreement with the experimental stress–strain data, confirming its applicability for accurately predicting the mechanical behavior of ASC. Under exposure to 3% NaCl solution, the NS-3-C retained a higher relative dynamic elastic modulus and exhibited reduced mass loss after 175 SFTCs, with improvements of 67.61 and 49.35%, respectively, compared to the specimen without NS (NS-0). Microscopic analysis confirmed that NS effectively refined the pore structure and improved matrix compactness, while PPF suppressed microcrack propagation and mitigated damage from salt-induced freeze–thaw deterioration.</p>

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Evaluation of Mechanical Properties and Salt Freeze–Thaw Durability of Polypropylene Fiber Nano-SiO2 Modified Aeolian Sand Concrete

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Wei Dong,
  • Enze Su,
  • Junfeng Wang,
  • Xinjie Zhang,
  • Gang Xue

摘要

This study explores the synergistic reinforcing effects of polypropylene fiber (PPF) and nano-silica (NS) on the performance of aeolian sand concrete (ASC). A modified aeolian sand concrete (NPAC) incorporating various dosages of NS and PPF was prepared to investigate the influence of NS mass fraction and PPF volume fraction on its mechanical properties, salt frost resistance, and microstructural characteristics. Results indicate that the specimen incorporating 2.4% NS and 0.75% PPF by volume (designated as NS-3-C) exhibited superior mechanical strength and durability under salt freeze–thaw conditions. Specifically, NS contributed to matrix densification and strength enhancement, while PPF improved the post-peak ductility and strain capacity. The combined action of NS and PPF led to a significant improvement in overall performance. Compared to unmodified ASC, the NS-3-C showed increases in compressive strength, flexural strength, and splitting tensile strength of 4.77, 11.81, and 18.77%, respectively. Moreover, the incorporation of 0.75% PPF resulted in a 17.45% increase in peak strain relative to the counterpart without fibers. The proposed constitutive model exhibits excellent agreement with the experimental stress–strain data, confirming its applicability for accurately predicting the mechanical behavior of ASC. Under exposure to 3% NaCl solution, the NS-3-C retained a higher relative dynamic elastic modulus and exhibited reduced mass loss after 175 SFTCs, with improvements of 67.61 and 49.35%, respectively, compared to the specimen without NS (NS-0). Microscopic analysis confirmed that NS effectively refined the pore structure and improved matrix compactness, while PPF suppressed microcrack propagation and mitigated damage from salt-induced freeze–thaw deterioration.