The compositions of self-compacting fine-grained concrete using mineral additives such as silica, limestone flour and trepel, as well as polycarboxylate superplasticizer, have been studied. The main attention is paid to the effect of the composition of the mixture on the compressive and flexural strength, density, water resistance and frost resistance of concrete. The test results showed that samples with silica demonstrate increased strength, while the introduction of trepel and limestone flour reduces this indicator. The highest density and frost resistance (F600) were achieved in formulations with silica, without additional additives. The work highlights the importance of optimizing the grain composition of aggregates and the choice of plasticizers to improve concrete performance.

Keywords: self-compacting concrete, fine-grained concrete, silica, polycarboxylate superplasticizer, limestone flour, trepel, strength, density, frost resistance, water resistance

A review of the literature in the field of construction heat engineering and regulatory requirements for thermal protection of buildings is given. A study of methods of increasing thermal protection for reconstructed and designed buildings, taking into account modern requirements, has been carried out. A methodology for strengthening the thermal protection of building structures has been developed.

Keywords: thermal performance of building , energy efficiency, heat-efficient enclosing structures, thermal insulation materials

It is found that a sufficiently high catalytic activity of the metal oxide electrode is due to the state of phase disordering of the coating surface due to the presence of highly dispersed spinel-like and rutile-like phases of solid solutions, as well as the nature of the distribution of these phases in the coating volume. The possibility of formation of disordered and partially ordered spinel-like phases of the form (Co,Mn)3-xO4 is analyzed

Keywords: structural-phase disorder, solid solutions, spinalator phase retinopathy phase coating

The possibility of formation of a certain set of disordered and partially ordered phases of solid solutions with defective spinel structures is analyzed. The compositions and symmetry of the structures of ordered phases and the nature of the change in residual disordering depending on the degree of deviation from the stoichiometry of the structural type of normal spinel are theoretically determined.

Keywords: structural-phase disorder, solid solutions, spinalator phase retinopathy phase coating

Hot stamping of porous billets (GSPZ) is considered. Structural steels obtained with the use of GSPZ technology are significantly inferior in terms of machinability by cutting similar in chemical composition to cast and hot-rolled steels. Various alloying elements are considered to improve the machinability of structural powder steels by cutting and their effect on physical and mechanical properties.

Keywords: powder metallurgy hot stamping of porous billets, GSPS, machinability, alloying elements

The interrelation of tribological properties of composite coatings with the properties, structure and distribution of surface phases, as well as the mechanism of formation of surface phases is discussed.

Keywords: the structure of crystals, structural phase disorder, tribological properties of the surface phases of the composite coating

The conditions, which must be met by modifying additives into electrolyte for receiving of the effective composite Ni-P coatings with anti-friction properties, and the possibility of choice of the effective modificators were discussed. The efficiently of the ultra-dispersion powders of oxides with the corunde and rutile structures, the carbon and boron nitride with diamond-like structures, and powders of the some W and Mg type structures was examined.

Keywords: structural phase disordering, nanostructures, compositional coatings, nano-diamond, anti-friction properties,modifiers

Hot stamping of porous preforms is considered. Structural steels obtained with the technology of hot stamping of porous blanks are much inferior in terms of machinability by cutting similar cast and hot-rolled steels to the chemical composition. The reasons for the poor machinability of cutting structural steel powders are given.

Keywords: powder metallurgy, hot forging of porous preforms, machinability by cutting

Influence of the fluorinated surface-active substances entered info a solution of chemical nickel plating, on operational properties nickel-phosphoric of the coverings besieged from investigated structures (solutions) is considered.

Keywords: nickel-phosphoric of the covering; surface-active substances; operational properties

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