Research of Impedance Properties of Cementitious Materials Based on Conductive Ion Curing
In order to explore the relationship between OH-ions and the resistivity of hardened cementitious materials,the pH value,electrical conductivity and resistivity of hardened slurry of specimens with different admixtures are studied using silica fume,mineral powder and fly ash as admixtures.The results show that silica fume,mineral powder and fly ash can play a curing effect on OH-,and the degree of influence of the three kinds of admixtures on the pH value are:fly ash＞silica fume＞mineral powder.Silica fume and mineral powder can effectively reduce the pore liquid conductivity of the hardened cement slurry,and with the increase of the amount of admixture of the pore liquid conductivity decreases,and the two of the pore liquid pH and conductivity shows a very strong correlation.With the increase of fly ash content,the Pearson correlation coefficient between pore fluid conductivity and pH value gradually decreases.The resistivity of hardened cementitious materials doped with silica fume and mineral powder has a strong correlation with their internal OH-content.The enhancement effect of the three admixtures on the resistivity of hardened cementitious materials is:silica fume＞mineral powder＞fly ash.
cementitious materialsconductive ion curingconductivityelectrical resistivity
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