混凝土中孔结构的分形维数研究  

Fractal Dimension of Pore Structure of Concrete

作　　者：韦江雄[1] 余其俊[1] 曾小星[1] 白瑞英[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2007年第2期121-124,共4页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50602016);特种功能材料及其制备教育部重点实验室青年创新基金资助项目(200500A);硅酸盐材料工程教育部重点实验室开放基金资助项目(SYSJJ2006-07)

摘　　要：建立了分形模型来模拟水泥浆体的空间结构,在此基础上推导出了孔体积分形维数D和孔隙率P、孔径分布的关系式;根据所得公式预测混凝土的孔体积分形维数D在0到3之间,并且D值随孔隙率减小和孔径分布范围变宽而增大.同时运用压汞法(M IP)测定普通硅酸盐混凝土的孔结构,进行孔体积分形维数计算,发现孔体积分形维数与强度之间有比较好的相关性.A fractal model is established to simulate the spatial structure of concrete slurry, and a formula that describes the relationship among the fractal dimension D, the porosity P and the pore distribution is deduced. Based on the proposed formula, a fractal dimension of concrete pore structure in the range of 0 to 3 is obtained, which increases with the decrease in porosity and with the widening in pore distribution. Moreover, a Mercury Intrusion Porosimeter （MIP） is used to determine the pore structure of ordinary Portland cement and to calculate the corresponding fractal dimension. The results indicate that the fractal dimension and the concrete strength are closely interrelated.

关 键 词：混凝土 分形维数 孔隙率 孔分布 

分 类 号：TU528.2[建筑科学—建筑技术科学]