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<p>Coastal port foundations frequently necessitate substantial quantities of cement within marine clay. While the incorporation of nano-SiO₂ can lead to a reduction in cement consumption, it may also result in increased brittleness and cracking. Fibers can help alleviate such damage by bridging the cracks; however, their influence on the overall mechanical performance remains constrained. This research examines the enhancement of cemented soil through the addition of nano-SiO₂ alongside polypropylene (PP), polyvinyl alcohol (PVA), basalt, and carbon fibers. Tests including unconfined compressive strength (UCS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and nuclear magnetic resonance (NMR) were performed. The findings indicate that seawater corrosion further intensifies the brittleness of nano-cemented soil. The optimal combination of 3.2% nano-SiO₂ and 1% PP fiber resulted in the most significant increase in UCS, achieving a remarkable 369% enhancement in seawater conditions. Both PP and PVA fibers displayed deeper and more distinct surface indentations, which improved mechanical interlocking between the nano-SiO₂ and fiber interfaces at the microscopic level. Nevertheless, the hydrophilic nature of PVA fibers made them more vulnerable to corrosive ion attacks, diminishing their effectiveness in seawater compared to PP fibers. In summary, the combination of PP fibers with nano-SiO₂ significantly enhanced pore structure and resistance to seawater corrosion, showcasing considerable potential for practical applications in coastal and marine foundation engineering, whereas basalt and carbon fibers exhibited a more limited effect.</p>

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Mechanical Properties and Seawater Corrosion Resistance Mechanisms of Nano-Cemented Soil Reinforced with Different Fibers: Laboratory study

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Qingsheng Chen,
  • Jinhui Li,
  • Gaoliang Tao,
  • Zhilin Xiong,
  • Sanjay Nimbalkar,
  • Pai Peng,
  • Erhui Guo

摘要

Coastal port foundations frequently necessitate substantial quantities of cement within marine clay. While the incorporation of nano-SiO₂ can lead to a reduction in cement consumption, it may also result in increased brittleness and cracking. Fibers can help alleviate such damage by bridging the cracks; however, their influence on the overall mechanical performance remains constrained. This research examines the enhancement of cemented soil through the addition of nano-SiO₂ alongside polypropylene (PP), polyvinyl alcohol (PVA), basalt, and carbon fibers. Tests including unconfined compressive strength (UCS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and nuclear magnetic resonance (NMR) were performed. The findings indicate that seawater corrosion further intensifies the brittleness of nano-cemented soil. The optimal combination of 3.2% nano-SiO₂ and 1% PP fiber resulted in the most significant increase in UCS, achieving a remarkable 369% enhancement in seawater conditions. Both PP and PVA fibers displayed deeper and more distinct surface indentations, which improved mechanical interlocking between the nano-SiO₂ and fiber interfaces at the microscopic level. Nevertheless, the hydrophilic nature of PVA fibers made them more vulnerable to corrosive ion attacks, diminishing their effectiveness in seawater compared to PP fibers. In summary, the combination of PP fibers with nano-SiO₂ significantly enhanced pore structure and resistance to seawater corrosion, showcasing considerable potential for practical applications in coastal and marine foundation engineering, whereas basalt and carbon fibers exhibited a more limited effect.