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<p>This study presents a sustainable method to enhance expansive soil performance by integrating enzyme induced carbonate precipitation (EICP) with basalt fiber (BF) reinforcement. Laboratory experiments were conducted using an optimized EICP 0.75&#xa0;mol/L concentration and 1.5% BF (12&#xa0;mm length). The results demonstrated that the combined treatment substantially reduced the swelling pressure and permeability (k<sub>s</sub>) by up to 95% and 72%, respectively. This combined approach surpassed the effectiveness of the individual treatments, as EICP alone resulted in an 80% decrease in swelling pressure and a 63% reduction in k<sub>s</sub>. Additionally, synergetic treatment enhanced the engineering properties of the expansive soil. Specifically, the unconfined compressive strength increased 136%, cohesion 58%, internal friction angle 89%, unsoaked CBR 738%, and soaked CBR 911%, respectively. These enhancements were considerably more substantial than those obtained through EICP treatment alone, which yielded improvements of only 66, 43, 48, 441, and 435%, respectively. Additionally, microscopic analysis, scanning electron microscopy, demonstrated that while EICP deposits calcium carbonate within soil pores, the incorporation of BF provided additional structural reinforcement by bridging particles and enhancing interfacial bonding. These results underscore the combined effect of bio-cementation and fiber reinforcement, presenting an eco-friendly and durable technique for enhancing expansive soils in civil engineering projects.</p>

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Basalt fiber reinforcement cementation with bio-inspired carbonate precipitation for stabilization of expansive soil

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月10日

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  • Mudassir Mehmood,
  • Ahmed M. Yosri,
  • Wen Nie,
  • Shoujian Peng,
  • Muhammad Nadeem,
  • Nejib Ghazouani,
  • Majed Alzara

摘要

This study presents a sustainable method to enhance expansive soil performance by integrating enzyme induced carbonate precipitation (EICP) with basalt fiber (BF) reinforcement. Laboratory experiments were conducted using an optimized EICP 0.75 mol/L concentration and 1.5% BF (12 mm length). The results demonstrated that the combined treatment substantially reduced the swelling pressure and permeability (ks) by up to 95% and 72%, respectively. This combined approach surpassed the effectiveness of the individual treatments, as EICP alone resulted in an 80% decrease in swelling pressure and a 63% reduction in ks. Additionally, synergetic treatment enhanced the engineering properties of the expansive soil. Specifically, the unconfined compressive strength increased 136%, cohesion 58%, internal friction angle 89%, unsoaked CBR 738%, and soaked CBR 911%, respectively. These enhancements were considerably more substantial than those obtained through EICP treatment alone, which yielded improvements of only 66, 43, 48, 441, and 435%, respectively. Additionally, microscopic analysis, scanning electron microscopy, demonstrated that while EICP deposits calcium carbonate within soil pores, the incorporation of BF provided additional structural reinforcement by bridging particles and enhancing interfacial bonding. These results underscore the combined effect of bio-cementation and fiber reinforcement, presenting an eco-friendly and durable technique for enhancing expansive soils in civil engineering projects.