摘要
采用压汞法对不同龄期粉煤灰-水泥浆体的孔分形结构进行了实验研究,测定了复合浆体孔体积分形维数,探讨了孔体积分形维数与孔隙率,孔表面积、平均孔径、孔分布及宏观力学性能的关系。实验结果表明:粉煤灰-水泥浆体的孔结构具有明显的分形特征,孔体积分形维数在3.3～3.5之间;孔体积分形维数越大,浆体的孔径越小、孔隙率越低,孔表面积越大,小于20 nm的微孔越多,大于100 nm的大孔越少,而且复合体系的抗压及抗折强度也越高。
Pore volume fractal dimensions of fly ash - cement paste at different ages and its pore volume fractal dimensions were determined by MIP(mercury intrusion porosimetry) on experiments. The relationship of pore volume fractal dimension with porosity, pore area, average pore diameter, pore size distribution, compressive and flexural strength of fly ash - cement paste were investigated. Results show that pore structures of fly ash - cement pastes have typical fractal nature and the values of fractal dimension are between 3. 3 and 3. 5. The higher fractal dimension is, the smaller average diameter of pore becomes, the lower porosity becomes, the larger pore area would be. Besides increment of the value of fractal dimension also means the increase of small size pores less than 20 nm and decrease of large size pores beyond 100 nm and the improvement of compressive and flexural strength of fly ash - cement paste as well.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2003年第8期774-779,共6页
Journal of The Chinese Ceramic Society
基金
国家重点基础研究发展规划资助项目(2001CB610703)
关键词
粉煤灰
水泥浆体
体积分形维数
压汞法
孔结构
强度
fly ash
cement paste
volume fractal dimension
mercury intrusion porosimetry
pore structure
strength
