摘要
Purpose This study explores the use of basalt fibers (BF) reinforcement and Stabilization/Solidification (S/S) technology with sustainable solid waste-based binder to treat high-moisture dredged sediments, aiming to utilize them as backfill materials in marine reclamation or urban underground projects. Materials and methods The research utilized a novel phosphogypsum-based binder to solidify sediments with high moisture content. A series of flow tests, unconfined compressive strength (UCS) tests, and scanning electron microscopy (SEM) tests were conducted to evaluate the reinforcing effects of BF on the flowability, mechanical properties, and micro-mechanisms of solidified dredged sediments. Meanwhile, the environmental and economic impacts were also analyzed. Results and discussion Results demonstrate that the flowability of solidified sediments decreases with BF or binder addition but increases with initial moisture content. It can be adjusted using a superplasticizer to meet liquid backfill requirements. The inclusion of BF significantly enhances the mechanical performance of solidified sediments. At 0.1% BF content and 6 mm BF length, the 28 d UCS values of solidified sediments increase from 1045.28 kPa (without BF) to 1454.78 kPa, representing a 39.18% increase. Moreover, 0.1% BF content and 3 mm BF length are identified as the optimal combination for improving the UCS of solidified sediments. Microstructural analysis confirms that incorporating BF promotes the formation of a dense matrix and suppresses crack propagation. Notably, the novel BF-reinforced backfill material reduces costs by 9.80% and CO₂ emissions by 67.63%, compared with OPC-based materials. Conclusion Overall, these findings offer innovative insights into high-moisture sediment S/S and fiber reinforcement, providing a theoretical reference for its sustainable use in geotechnical engineering.
危险品化学品经营许可证（带存储）