摘要
针对鄱阳湖湖底淤泥高含水率、细颗粒富集的复杂特性,采用复合激发技术与微观结构试验,探究了利用鄱阳湖湖底淤泥研制固化复合材料的可行性。通过掺入矿粉等工业废料及Na2SiO4、Na2SO4、Na2CO3和NaOH等激发剂,系统评估了固化淤泥的力学性能、耐水蚀性能和抗冻融性能;结合微观结构分析,揭示了复合激发剂对固化淤泥性能的调控机制。结果表明,复合激发剂的掺入促进了团絮状胶凝物质的生成,有效填充孔隙并增强颗粒间联结,优化了固化淤泥的微观结构,为鄱阳湖湖底淤泥资源化利用的可行技术路径。其中,Na2SiO4与NaOH形成Na+-OH-双驱网络,显著促进了淤泥中无定形SiO2与Al2O3的解聚-缩聚反应,生成C-A-S-H、N-A-S-H等碱凝胶;水化产物的有序分布大幅提升固化淤泥28 d抗压强度至11.61 MPa,较对照组提高69.0%,耐水蚀与抗冻融性能同步增强。
To address the complex characteristics of high water content and fine-grained composition in Poyang Lake sediment,composite activation technology and microstructure tests were adopted to explore the feasibility of developing solidified composite materials from Poyang Lake sediment.By incorporating industrial waste materials such as mineral powder,along with activators including Na2SiO4,Na2SO4,Na2CO3,and NaOH,the mechanical properties,water-erosion resistance,and freeze-thaw resistance of the solidified sediment were systematically evaluated.Combined with microstructure analysis,the regulatory mechanism of the composite activators on the performance of the solidified sediment was revealed.The results show that the addition of the composite activators promotes the formation of flocculent cementitious substances,effectively fills the pores,enhances the interparticle bonding,and optimizes the microstructure of the solidified sediment,providing a feasible technical path for the resource utilization of Poyang Lake sediment.In particular,the Na+-OH-dual-drive network formed by Na2SiO4 and NaOH significantly promotes the depolymerization-polycondensation reaction of amorphous SiO2 and Al2O3 in the sediment,generating C-A-S-H,N-A-S-H and other alkali gels.The ordered distribution of hydration products significantly increases the 28-day compressive strength of the solidified sediment to 11.61 MPa,a 69.0%increase over the control group,while simultaneously improving water-erosion resistance and freeze-thaw resistance.
作者
周志美
贾东洋
邹非凡
王耀宗
王剑
李长明
ZHOU Zhimei;JIA Dongyang;ZOU Feifan;WANG Yaozong;WANG Jian;LI Changming(Fuzhou Ganghui Water Conservancy Construction Co.,Ltd.,Fuzhou 344100,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Jiangxi Academy of Water Science and Engineering,Nanchang 330029,China)
出处
《水利水电科技进展》
北大核心
2025年第6期98-106,133,共10页
Advances in Science and Technology of Water Resources
基金
河南省高等学校重点科研项目(24A570004)
河南省黄河流域生态环境保护与修复重点实验室开放基金项目(LYBEPR202104)。
关键词
固化淤泥
碱激发
耐蚀性能
微观结构
资源化利用
鄱阳湖
solidified sludge
alkali excitation
corrosion resistance
microstructure
resource utilization
Poyang Lake
