ON THE PHYSICAL MEANING OF THE COEFFICIENT OF FRICTION UNDER CONDITIONS OF ABNORMALLY LOW FRICTION AND WEAR

. The theoretical studies of tribosystems (TS) operating under conditions of abnormally low friction and wear are given. On the basis of the analysis of the mechanisms of dissipation of external energy, as factors of friction reduction in different areas of nature, the role of the wave component of friction force is clarified. Under certain thermodynamic conditions, a sufficiently large wave component of the friction force is formed in the TS, which significantly reduces the molecular-mechanical. The wave component F w of the friction force F fr is the «entropy pump» that converts the non-compensated external friction into the internal friction and accumulates the internal energy in the elastic-plastic layer of the rheological model of Shvedov tribosystem construction. The physical meaning of the friction coefficient for TS operating under conditions of normal mechanochemical wear and abnormally low friction and wear has been determined. It is determined that the main cause of the tribosystems transition to abnormally low friction and wear is the rheological properties of the tribosystem surface layer. In an anomalous-low friction and wear mode tribosystem, an equilibrium and inverse change of some insignificant amount of energy without work is possible. TS heat dissipation in this case approaches zero. When the external friction conditions change, the degree of excitation of tribosystem n, which depends on the number of mechanical quanta, changes. Any change in the tribosystem that puts it off balance, according to Le Chatelier principle, initiates in it processes that try to return it to its original position. For these processes in the developed model is responsible module of canonical energy distribution, which is regulated by microgeometry of the surface layer of TS. It is established that the condition of achieving abnormally low friction and wear is the equality of robots that perform external and internal forces in terms of contact interaction. Structural-energy approach to contact interaction allowed to establish the physical meaning of the coefficient of friction, which generally characterizes the work of external and internal forces in the path of friction tribosystems. Abstract. The actuality of alkali-activated slag cements (AASC) implementation is due to their conformity with modern tendencies concerning efficient consumption of raw materials and energy, while ensuring high functionality of mortars and concretes. AASC concretes are characterized by increased strength, sulfate resistance, freeze-thaw resistance and weather resistance in comparison