漂珠低密度水泥石的孔体积分形维数及其与孔结构和力学性能的关系

Study on Pore Volume Fractal Dimension of Microsphere Low Density Cement and Its Relationship with Pore Structure and Mechanical Properties

运用压汞法测试漂珠低密度水泥石孔结构参数、Menger海绵模型计算其孔体积分形维数，分析评价了漂珠低密度水泥石的孔结构分形特征，探讨了孔体积分形维数与孔隙率、孔比表面积、中值孔径及力学性能的关系。研究表明，低密度水泥石孔结构具有明显的分形特性，孔体积分形维数在3．25-3．69；孔体积分形维数越大，其孔隙度、孔比表面积、中值孔径越大，而抗压强度、抗拉强度越小。孔体积分形维数不仅在描述孔隙空间结构时更加具体，同时在一定程度上反映了材料宏观性能的相对优劣。

Pore structure parameters of microsphere low density cement pastewas tested by mercury porosimetryand pore volume fractal dimensionwas counted by Menger sponge model in this paper. Pore fractal characteristicsof mierosphere low density cement pastewas analysed and appraised, besides, relation of pore fractal dimension to porosi- ty, total pore area, median pore diameter and mechanical properties was explored. Studies had shown that pore struc- ture of microsphere low density cement paste exhibited obvious pore fractal characteristic and the pore volume fractal dimension was between 3. 25 to 3. 69 ; porosity, total pore area and median pore diameter became greater with the increase of pore volume fractal dimension, while compressive strength and tensile strength decreased. Pore volume fractal dimension is more specific in the description of pore structure and meanwhile it reflects the relative merits of the macroscopic properties of material.