赤泥-煤矸石基胶凝材料水化过程XPS分析

为了透彻了解赤泥-煤矸石基胶凝材料水化过程中所发生的物理化学变化，采用X射线光电子能谱技术（XPS）对赤泥-煤矸石基胶凝材料水化过程中Ca、Si、Al、O、Na等主要元素化学键能的变化进行了深入、系统的分析。结果表明：水化3 d至90 d的赤泥-煤矸石基胶凝材料水化产物中Ca、Si、Al、Na、O等主要元素的结合能均随着水化龄期的延长逐渐升高；Na1s结合能的升高说明赤泥-煤矸石基胶凝材料在水化过程中对Na+具有一定程度的固化作用；随着C-A-S-H凝胶钙硅原子比的升高，Si2p结合能将降低，二者呈较好的线性负相关性；基于水化产物的O1s结合能与相对桥氧数（RBO值）之间具有良好的线性正相关性，因此可用水化产物O1s结合能来评价胶凝产物中［SiO₄］四面体的聚合度。

XPS Analysis on Hydration Process of Red Mud-Coal Gangue Based Cementitious Materials

In order to fully understand the physical and chemical changes during the hydration process of red mud-coal gangue based cementitious materials，X-ray photoelectron spectroscopy(XPS) technique was used to investigate the binding energy among Ca，Si，Al，O and Na elements of the hydration products of red mud-coal gangue based cementitious materials. The results showed that with the increasing of hydration period from 3 to 90 days，the binding energies among Ca，Si，Al，O and Na elements of the hydration products gradually increased. Especially，the increasing of Na1s binding energy represents that the red mud-coal gangue based cementitious materials can solidify Na+ during the hydration process. Si2p binding energy decreases with the increasing of Ca/Si atom ratio of C-A-S-H gel，and negative linear correlation occurs between them. As O1s binding energy of the hydration products has positive linear correlation with the relative number of bringing oxygen(RBO). Therefore，O1s binding energy can be used to evaluate the polymerization degree of ［SiO₄］ tetrahedron from hydration products.