碳化水泥砂浆分形特征研究

Fractal characteristics of cement paste by carbonation

利用压汞试验对不同碳化程度水泥砂浆孔结构的分形特征进行研究。结果表明:水泥砂浆具有多重分形的特征;碳化使水泥砂浆总孔隙率降低,孔径细化,凝胶孔的孔隙体积分形维数降低;而生成的碳酸钙在大孔、毛细孔中沉积,大孔、毛细孔的体积分形维数增大。因此,分形维数能表达碳化对混凝土材料孔结构的影响。

The pore volume fractal dimension of cement paste at different carbonation degree is studied by M/P （mercury intrusion porosimetry）.Results show that,pore structure of cement paste has multifractal characteristics.Carbonation of cement paste decreased porosity and pore size.Volume fractal dimension of gel pore decreased.Calcium carbonate deposited in large holes and capillaries.Volume fi＇actal dimension of capillaries and big holes increased.Therefore, the fractal dimension can express the pore structure of concrete by carbonation.