硅粉水泥石中微孔界面分形结构实验研究

Experimental study on micropore interface fractal structure of silica fume cement paste

采用X射线小角散射(SAXS)技术,对硅粉水泥石中微孔孔界面分形结构进行实验研究.结果表明,硅粉水泥石中微孔界面不具有分明的边界,而是有一个2nm左右的电子密度缓变的过渡层;微孔界面具有分形结构特征,分形维数与3接近,说明其孔界面是非常粗糙的;水胶比、硅粉含量对孔界面分形维数具有显著的影响,笔者根据实验结果,从微观的角度进行了探讨性的解释.

The experimental study is carried out by use of the small angle X-ray scattering technology. The results indicate that the boundary of the micropore interface of silica fume cement paste is not clear, but there exists a transition zone with slow variation of electronic density, the thickness of which is about 2nm, that the interface is of the fractal structure characteristics, the fractal dimension being close to 3, showing the high roughness of the pore interface, and that the water-binder ratio and the content of silica fume have evident effects on the fractal dimension. Finally, some explanations of the experimental results are given from the microscopic angle.