水泥石中微孔各向异性的描述与实验测定

Description and Experimental Determination of Anisotropy of Micro Pores in Cement Paste

材料中气孔的形状对材料的许多宏观性能有着重要的影响．本文根据Ｘ射线小角散射理论提出并定义了描述水泥石中微孔各向异性程度的特征参数——孔的形状因子．通过多种水泥石试样微孔形状因子的实验研究及由回转半径法确定的孔形状因子的比较研究，论证了本文定义的形状因子能对气孔各向异性程度给出较准确的描述．研究同时说明本文中所讨论的水泥石中气孔的形状大多数接近于球形．

The shape or anisotropy of pores in materials has important effects on their physical and chemical properties. According to the theory of small angle X ray scattering, this paper defines a parameter called shape factor for the description of the degree of anisotropy of micro pores in cement paste. It is shown that the shape factor defined in the paper can properly describe the anisotropic degree of pores, through an experimental study on the pore shape factors of several cement samples and a comparison between the shape factors determined by the present method and the gyration radius method. The results also show that the pores are almost spherical in shape.