| 摘要: |
| 描述了碱矿渣胶凝材料固液界面的双电层特性，测试分析了不同氯离子浓度及表面活性剂掺量下的Zeta电位，阐明了双电层效应对氯离子扩散和吸附的影响机理.结果表明：碱矿渣胶凝材料的Zeta电位为负值，随着氯离子浓度的增大Zeta电位绝对值减小；阳离子表面活性剂可使碱矿渣胶凝材料的Zeta电位转为正值，并提高氯离子吸附能力，减小有效氯离子扩散系数，而阴离子表面活性剂效果相反；碱矿渣胶凝材料孔隙表面双电层效应的改变可使氯离子吸附能力改变50%以上. |
| 关键词: 碱矿渣 双电层 氯离子传输 表面活性剂 Zeta电位 |
| DOI：10.3969/j.issn.1007-9629.2023.09.001 |
| 分类号:TU528.01 |
| 基金项目:福建省海洋经济发展专项资金项目（FJHJF-L-2022-19）；国家自然科学基金资助项目（51978171）；福州市科技局科技创新平台项目（2021-P-031）；福建省自然科学基金资助项目（2020J01482）；福州大学贵重仪器设备开放测试基金资助项目（2023T026） |
|
| Effect of Electrical Double Layer on Chloride Transport in Alkali-Activated Slag Cementitious Materials |
|
ZHANG Yong, FANG Yuchi, XU Yiyang, XIA Yu, YANG Zhengxian
|
|
College of Civil Engineering， Fuzhou University， Fuzhou 350108， China
|
| Abstract: |
| The characristic of electrical double layer（EDL） on the solid-liquid interface in alkali-activated slag cementitious materials were described. The Zeta potential under different concentrations of chloride and surfactant dosages was measured and analyzed. Mechanisms of the EDL’s effect on chloride diffusion and adsorption were clarified. The results show that the Zeta potential of alkali-activated slag cementitious materials is negative， and it becomes less negative with an increase in chloride concentration. Cationic surfactants can convert the Zeta potential to positive value， thereby improving the capacity of chloride adsorption and reducing the effective chloride diffusion coefficient. However， anionic surfactants have the opposite effect. The change of EDL’s effect on the pore surface of alkali-activated slag cementitious materials can alter the capacity of chloride adsorption by more than 50%. |
| Key words: alkali-activated slag electrical double layer chloride transport surfactant Zeta potential |
