KINETIC PARAMETERS AND THE DETERMINING EQUATIONS OF STRUCTURE FORMATION AND HARDENING OF A CEMENT STONE OF A DIFFERENT STRUCTURE IN THE INTERVAL OF TIME UP TO 18 YEARS AFTER PROPARKS
The experimentally obtained data on the study of the effect of quantitative dosage and the dosing procedure of superplasticizer C-3 on the change in the numerical values of the parameters of structural strength and the values of empirical coefficients of the kinetic dependencies of cement stone parameters in the time range from 28 days to 18 years are presented. Mathematical models of the change in the ultimate strength for axial compression, the tensile strength in bending, the critical stress intensity factor and acoustic emission energy are obtained. A comparative assessment of the named parameters obtained as a result of a physical experiment and on the basis of phenomenological models was made. It is shown that modifying the cement stone structure with a superplasticizer leads not only to a noticeable change in the numerical values of the structural strength parameters, but also to a more noticeable variation in the deviations of the considered parameters, found experimentally and using an analytical formula, in the control test dates. At the same time, with respect to the axial compression strength parameter, the parameters R<sub>bt</sub>f, K<sub>1C</sub> and Е<sub>АВ</sub> , and the fluctuation of numerical deviations are more structurally sensitive parameters.