|
Concrete pore fractal characteristics, pore fractal characteristics have a greater impact on the chloride ion permeability, the hole fractal dimension can be integrated to reflect the fractal characteristics of concrete pore. In this paper, the method of image analysis and mercury intrusion analysis to obtain the pore structure parameters and the concrete pore surface fractal dimension and volume fractal dimension calculated on this basis, explores the fractal dimension of holes characterization of concrete chloride ion permeability. The study showed that the roughness of the concrete pore surface fractal dimension represents the range between 1 to 1.2, the surface fractal dimension greater the number, the greater the roughness, the smaller the surface fractal dimension, the roughness of the more small, with the growth of the age, the roughness is getting smaller and smaller. Body fractal dimension representative is the complexity of the pore distribution of concrete, the higher the degree of which ranges between 3 to 3.2, the pore volume distribution of the complex, its space-filling capability stronger, fine pores occupy more space, p-chloro ions hinder the stronger the effect. Volume fractal dimension is greater, the fine pores of concrete covered with a uniform distribution of non-communication, the chloride ion which occurred penetration difficult. When limestone dosage is gradually increased from 10% to 30%, the concrete pore surface fractal dimension began to show a large range, the surface fractal dimension with chlorine ion permeability or the strength of the correlation is also gradually increased. When 30% ash admixture (fly ash, slag, limestone) added opposite the fractal dimension has not changed much, but the chloride ion permeability of concrete and strength difference with surface fractal dimension correlation descending order of the number of fly ash, slag, limestone, indicating that one of the important factors in addition to surface fractal dimension, the admixture of the active correlation need to consider. Volume fractal dimension limestone content is 10% volume fractal dimension changes the maximum dosage for 20% and 30%, in turn reducing admixture volume fractal dimension degree of change from high to low The fly ash, slag, limestone. The admixture or dosage changes, with the size of the chloride ion permeability or strength comes down to in the end is to see whether this change make concrete pore volume fractal dimension greater degree of change. In addition, the combination of the Katz-Thompson equation Byung Hwan Oha available chlorine ion permeability coefficient equations, etc., the thesis of concrete pore fractal characteristics of chloride ion penetration theory model with equations of the model equations to explain the fractal dimension of concrete and the relationship between the chloride ion penetration.
|