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<p>The open channel in the Xinjiang Desert is essential for water resource transportation across northern Xinjiang. However, cracks in the bank slope linings threaten the structural stability of the channel. Traditional crack repair materials perform poorly in arid areas. In this study, microbial-induced calcium carbonate precipitation (MICP) combined with desert aeolian soil was proposed to repair cracks with different widths in channel lining in an environmentally friendly way. The repair performance of MICP technology on cracks in concrete lining with a width of 0.1–5.0&#xa0;mm during the specified repair cycle was evaluated by macro- and microtests. The results show that for cracks with a width of 0.1–1.0&#xa0;mm, MICP technology achieves an area repair rate of 93.6% and above, the permeability coefficient is reduced by three orders of magnitude, and the capillary absorption height recovers 72%, while the repair efficiency of cracks with a width greater than 1.0&#xa0;mm is significantly reduced. Based on this, the incorporation of desert aeolian soil aggregate can greatly improve the repair effect of wide cracks and ensure that the repaired structure has excellent water resistance and impermeability. This paper clarifies the critical crack width that MICP alone can repair within a specified repair cycle and demonstrates that once this threshold is exceeded, incorporating aeolian soil enhances repair efficiency. It provides a low-cost, eco-friendly, and sustainable solution for open channels in the Xinjiang Desert and offers a reference for maintaining biologically mediated infrastructure in desert environments.</p> Graphical abstract <p></p>

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Microbial-induced calcium carbonate precipitation combined with aeolian soil for crack repair in Xinjiang Desert open channel: a multi-scale study

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Jianxin Wang,
  • Jianing Zhu,
  • Hang Zhou,
  • Yusheng Li,
  • Shihao Zhang,
  • Chengming Feng

摘要

The open channel in the Xinjiang Desert is essential for water resource transportation across northern Xinjiang. However, cracks in the bank slope linings threaten the structural stability of the channel. Traditional crack repair materials perform poorly in arid areas. In this study, microbial-induced calcium carbonate precipitation (MICP) combined with desert aeolian soil was proposed to repair cracks with different widths in channel lining in an environmentally friendly way. The repair performance of MICP technology on cracks in concrete lining with a width of 0.1–5.0 mm during the specified repair cycle was evaluated by macro- and microtests. The results show that for cracks with a width of 0.1–1.0 mm, MICP technology achieves an area repair rate of 93.6% and above, the permeability coefficient is reduced by three orders of magnitude, and the capillary absorption height recovers 72%, while the repair efficiency of cracks with a width greater than 1.0 mm is significantly reduced. Based on this, the incorporation of desert aeolian soil aggregate can greatly improve the repair effect of wide cracks and ensure that the repaired structure has excellent water resistance and impermeability. This paper clarifies the critical crack width that MICP alone can repair within a specified repair cycle and demonstrates that once this threshold is exceeded, incorporating aeolian soil enhances repair efficiency. It provides a low-cost, eco-friendly, and sustainable solution for open channels in the Xinjiang Desert and offers a reference for maintaining biologically mediated infrastructure in desert environments.

Graphical abstract