| 摘要: |
| 为研究镍铁渣粉对水泥土渗透性能的影响，采用加压型渗透装置对镍铁渣粉水泥土在清水环境和海水环境下进行渗透试验，并用压汞试验和扫描电镜-能谱分析试验对镍铁渣粉水泥土进行微观分析.结果表明：清水环境和海水环境下镍铁渣粉的掺入均能提升水泥土的抗渗性能，而海水环境下尤为明显；镍铁渣粉掺量超过20%后，镍铁渣粉掺量增加对水泥土抗渗性能的影响逐渐变小；镍铁渣粉能发挥微集料效应和活性效应，减小水泥土的最可几孔径和总孔隙率，增强其抗海水侵蚀性能；镍铁渣粉能使水泥土的微细观结构更加致密，同时能促进水泥土生成具有低钙硅比的水化产物，增强其抗渗性能. |
| 关键词: 镍铁渣粉 海水环境 抗渗性能 孔结构 微细观结构 |
| DOI：10.3969/j.issn.1007-9629.2022.11.012 |
| 分类号:TU443 |
| 基金项目:国家自然科学基金海峡联合基金资助项目（U1605242）；福建省高校产学研联合创新项目（2022Y4002） |
|
| Impermeability of Cement Soil Mixed with Ferronickel Slag Powder in Seawater Environment |
|
CHEN Feng1, TONG Shenghao2, LAI Wentao3
|
|
1.College of Engineering， Fujian Jiangxia University， Fuzhou 350108， China;2.College of Civil Engineering， Fuzhou University， Fuzhou 350116， China;3.Research and Development Center of New Material Technology Application for Coastal Highway Construction and Maintenance， Fujian Communications Planning and;Design Institute Co.， Ltd.， Fuzhou 350001， China
|
| Abstract: |
| In order to study the effect of ferronickel slag powder on the permeability of cement soil， the permeability of ferronickel slag powder cement soil in clean water environment and seawater environment was studied by a pressurized infiltration device， and the microscopic analysis was carried out by mercury intrusion test and scanning electron microscope-energy spectrum analysis test. The results show that the addition of ferronickel slag powder can improve the impermeability of cement soil in both clean water environment and seawater environment， especially in seawater environment. When the content of ferronickel slag powder is more than 20%， the effect of increasing the content of ferronickel slag powder on the impermeability of soil-cement gradually decreases. The ferronickel slag powder can play a micro-aggregate effect and activity effect， reduce the maximum pore size and total porosity of cement soil， and enhance its resistance to seawater erosion. The ferronickel slag powder can make the microscopic structure of cement soil more compact， and promote the formation of hydration products with low calcium-silicon ratio， and enhance its impermeability. |
| Key words: ferronickel slag powder seawater environment impermeability pore structure microscopic structure |
