Possible Criterion for Evaluating the Compatibility of Components in the Building Mixtures

In this paper, based on the theoretical provisions of the theory of molecular interaction, the results of testing the algorithm proposed by the authors are presented for calculating the Hamaker constant as a characteristic of the dispersion interaction based on experimental data obtained during the study of a composition of fine powders of basalt and polymineral sand. The concept of the Hamaker analog constant is introduced; the method of determining and calculating it is based on a number of assumptions. The desired constant was calculated based on the measured equilibrium angles of wetting the surface of the dispersed material with liquids with known surface tension values. Water solutions of ethanol with different volume concentrations of the organic component were used as such liquids. For the correct application of water-alcohol systems in the proposed method, the physical and chemical constants of the water-ethanol system are calculated. It was found that the change in the structure of the powder composition allows controlling the intensity of the van der Waals interaction in the mixture, which is quantified by the value of the Hamaker constant. This fact makes it possible to select restoration (repair) construction compositions that are characterized by an increased affinity to the main material. The proposed experimental approach and algorithm for calculating the van der Waals interaction constant in fine powder systems can be used for compiling an informational reference database.