SOME ISSUES OF MOISTURE TRANSFER IN CONCRETE

Moisture transfer in concrete is a set of physical processes as a result of which, under certain conditions, prerequisites are created leading, in particular, to the emergence of destructive processes in the composite. Therefore, the study of such complex phenomena, the establishment of the laws of their course is of certain scientific interes

Some aspects of the processes of obtaining and application of mineral powders as fillers for cement systems

The main theoretical prerequisites for the thermodynamic analysis of the process of grinding rocks are given. The structural-energetic relationships between the regularities of plastic deformation with energy characteristics that occur during the crushing of mineral substances are described. The evaluation of the grindability of rocks in a ball mill under different grinding modes was made. Rational operating modes of the mill have been determined to ensure the required degree of grinding, which makes it possible to significantly reduce the energy consumption of the grinding process. To assess the quantitative content of adsorption centers, a classification of the “indicator of reduced hydration activity” is proposed. (Ppga), allowing the most accurate assessment of the contribution of the surface activity of mineral fillers to the course of the processes of interactions and transformations occurring in a hydrated medium