Research on Pore Volume Fractal Dimension and Its Relation to Pore Structure and Strength in Cement Paste with Perlite Admixture

By MIP(Mercury Intrusion Porosimetre) experiment pore structure parameters of Portland cement paste with 0-40% perlite admixture during 3 curing stages were determined and reported in this paper.Pore volume fractal feature was investigated with fractal theory and pore volume fractal dimensions D=3.3-3.5 were calculated in the cement-based materials.The relations of pore volume fractal dimension to pore structure in cement paste and compressive strength in mortar were analyzed and discussed in detail.The results show that there are close relations in linear equation between pore volume fractal dimension and pore structure parameters,such as porosity and pore special area.So is the compressive strength.With increasing of pore volume fractal dimension,porosity,pore special area and median pore diameter,pore structure is degraded and compressive strength is decreased correspondingly in cement paste.Therefore,it is finally concluded that pore volume fractal dimension can be used as comprehensive parameter to assess situation of pore structure for cement-based materials.