硅粉水泥石中的孔比表面积及其与强度的相关性

A Study of Pore Specific Surface Area and Its Correlation with the Strength of Silica Fume Cement Paste

采用X射线小角散射技术 ,对硅粉水泥石中孔比表面积作了实验研究 .研究表明 :所测硅粉水泥石中孔的比表面积是相当大的 ,其值在 70～ 190m2 /cm3 之间 ;孔界面具有分形特征 ,分形维数与 3接近 ,因此孔界面是非常粗糙的 ,比表面积与孔界面分形维数有着明显的相关性 ;水胶比增加比表面积减少 ,硅粉含量增加 ,比表面积增大 ;水泥石的抗压强度与比表面积存在较好的相关性 ,抗折强度与比表面积之间则呈现出一种较为复杂的关系 .

An experimental study on the micropore specific surface area of silica fume cement paste is carried out by use of small angle X ray scattering.The test results show that pore specific surface area of silica fume cement paste is very large(70～190?m 2/cm 3) and the pore surface is very rough, the fractal dimension is about 3,and the correlation of micropore specific surface area with fractal dimension is remarkable. The higher the silica fume content, the larger the value of pore specific surface area; the higher the ratio of water and binder, the smaller the value of pore specific surface area.The compressive strength is closely correlated with pore specific area;however, the relationship between pore specific surface area and bending strength is not clear.