Wang Jianxin, Zhu Jianing, Li Yusheng, Zhang Shihao, Feng Chengming
College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, 830052, China.
Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Urumqi, 830052, China.
Sci Rep. 2025 May 15;15(1):16862. doi: 10.1038/s41598-025-01582-2.
The bank slope structure of the open channel in the Xinjiang desert is affected by seasonal climate changes and water erosion, leading to lining cracking. This study identified the optimal culture conditions and mineralization factors for Sporosarcina pasteurii through strain cultivation and precipitation assays. Subsequently, 0.1~5.0 mm wide penetrating concrete cracks were prefabricated, and microbially induced calcium carbonate precipitation (MICP) repair tests were conducted over 16 cycles. These experiments included macroscopic performance evaluations, such as area repair rate, penetration resistance, and capillary water absorption tests, alongside microscopic analyses using X-ray diffraction and scanning electron microscopy. The results indicate that MICP technology effectively repairs narrow cracks, preserving crack surface integrity, significantly reducing permeability and water absorption, and enhancing the durability of the concrete. However, for cracks exceeding 1.0 mm in width, the repair efficiency declines progressively. Based on the experimental data, it is concluded that a crack width of 1.0 mm is the optimal threshold for effective MICP-based repair within 16 cycles, ensuring both structural integrity and optimal waterproofing. These results offer valuable insights into the potential application of MICP technology for the remediation of lining cracks in the bank slopes of water conveyance channels in Xinjiang Desert.
新疆沙漠地区明渠的岸坡结构受季节性气候变化和水流冲刷影响，导致衬砌开裂。本研究通过菌株培养和沉淀试验确定了巴氏芽孢杆菌的最佳培养条件和矿化因素。随后，预制了宽度为0.1~5.0毫米的贯穿混凝土裂缝，并进行了16个循环的微生物诱导碳酸钙沉淀（MICP）修复试验。这些实验包括宏观性能评估，如面积修复率、抗渗性和毛细吸水试验，以及使用X射线衍射和扫描电子显微镜的微观分析。结果表明，MICP技术能有效修复窄裂缝，保持裂缝表面完整性，显著降低渗透性和吸水性，提高混凝土耐久性。然而，对于宽度超过1.0毫米的裂缝，修复效率逐渐下降。基于实验数据得出结论，1.0毫米的裂缝宽度是在16个循环内基于MICP进行有效修复的最佳阈值，可确保结构完整性和最佳防水性。这些结果为MICP技术在新疆沙漠输水渠道岸坡衬砌裂缝修复中的潜在应用提供了有价值的见解。
