The article presents experimental studies of the effect of activated mixing water on the technological properties of building cement mixtures prepared with water treated in the electric field of soluble electrodes. As a result of water treatment in the electric field of soluble electrodes, the material of the electrodes dissolves and, depending on the field parameters (intensity, current strength), the water is saturated with polyvalent aluminum hydroxide, which affects the formation of a crystallization structure, which is formed due to the chemical interaction of the binder and ions of the dissolved material electrodes. As a result of the formation of crystalline hydrates, the hardening process is accelerated and contributes to an increase in the technological properties of the building mixture (strength, normal density of the mixture, setting time). The purpose of the study: scientific substantiation of the effect of water treated in the electric field of soluble electrodes on improving the technological properties of the building mixture. Methods: experimental studies of the effect of mixing water treated in the electric field of soluble aluminum electrodes, depending on the material of the electrodes and the characteristics of the electric field, on the technological properties of the mixture. To determine the effect of increasing the technological characteristics of the building mixture, the influence of the duration and modes of water preparation on the strength of the cement stone at different hardening times, the setting time, and the plasticity of the mixture were studied. Results: The results of experimental studies proved the possibility of improving the technological properties of building mixtures prepared with water treated in the electric field of soluble electrodes, confirmed the possibility of increasing the compressive strength of the studied samples compared to control samples. A cement mixture prepared with treated water is more plastic than a mixture prepared with ordinary water.

Keywords: electric field, soluble electrodes, tension, cement stone, strength, mobility

The buildings of the old housing stock, dating back to the second half of the 19th century, were built of bricks with lime mortar, the foundations were made of rubble stone, with and without cellars, the roofs were made of metal tin sheets on wooden rafters. Interfloor and attic floors were arranged on wooden (mainly pine wood) or metal beams with wooden filling. The building materials used for the construction of buildings of that period differed in strength characteristics, service life and, at the same time, were subjected to various negative influences during the period of operation. During the reconstruction of the ceiling on wooden beams, the standard service life of which is 40-60 years, it is necessary to install new ceilings, while preventing the destruction of the brickwork of the walls and the performance of work in difficult cramped conditions.

Keywords: reconstruction, housing stock, floors, inspection, defects, wooden beam, metal beam, profiled sheet