THEORETICAL BASES OF IMPREGNATION WITHOUT PRESSURE OF MELIORANTS AND THE APPLICATION OF ITS FEATURES IN PRACTICE OF FIXING MOBILE SANDS
Railways in the sandy deserts are drifted with sand. To stop sand drift, the sand surface is blocked by the creation of a protective crust. The crust is obtained by spraying a binder that impregnates the sand. Impregnation features determine the construction and technological parameters of work to fix the sand and the crust itself. Therefore, a theoretical and empirical study of the process of impregnation of sand with a binder is today an important task. The identification of the predominant character of impregnation under the influence of gravitational and capillary forces made it possible to establish the need for studying on physical models and the need for preliminary wetting of sand. Pre-wetting allows you to change the nature of impregnation from gravitational to capillary, which in turn leads to a decrease in the rate of impregnation and an increase in the degree of saturation of sand with a binder. As a result, the specific consumption of the working composition and the concentration of the binder are reduced. Thus, the study of the process of impregnating sand with binders made it possible to obtain resource-saving technology for fixing sand.