The investigation results are obtained in the course of joint researches on the issue of creating silicate materials with decreased impedance. It is known that functional additives introduced to achieve electric conductivity properties have negative effect on the material physical and technical characteristics. It is advised to use multiwall carbon nanotubes Fulvek 100 in the amount of 7% from the binder weight as the functional additive. The results obtained prove that the introduction of the given amount of the modifier does not result in the sufficient decrease in strength characteristics. To smooth the strength loss and provide the effective stability of electric conductivity from 1 up to 7% of calcium nitrate have been introduced. The application multifunctionality of this salt, which is revealed in anti-freezing and anti-corrosion action of the component has been proved, providing stable indexes of electrotechnical characteristics. The optimal composition containing 7% of carbon nanotubes and 3 % calcium nitrate possesses the decreased electric conductivity of the silicate matrix, which is 2,440 Ohms, at the same time, the decrease in the strength indexes is within 10% in comparison with the standard sample. To find the influence of the complex modification the character of the microstructure change has been investigated, which demonstrated significant changes in the morphology of new formations. The optimal electrotechnical characteristics are provided due to uniform distribution of nanostructures and formation of the networks of connected micropores, which are filled with the solution of calcium nitrate providing additional electric conductivity stable with time.