KINETICS OF CEMENT HYDRATION, PLASTIC STRENGTH OF CONCRETE OF CHANNEL CLADDING AND ITS THERMAL STRESS STATE

The presented research results show that the development of the technology of laying monolithic concrete under various temperature and humidity conditions of the external environment is associated with the acceleration of the hardening process of freshly laid concrete6and the acquisition of the necessary strength before reaching dangerous values of moisture loss and freezing. Only in this case can a high-quality material with high potential properties be obtained. The studies were carried out under isothermal conditions at different temperatures.The obtained data allow us to calculate the temperature fields of concrete that arise due to the exothermy of cement in non-stationary modes. The lining of the channel is considered as an isotropic plate unlimited in the horizontal direction, lying on a solid ground base. When solving the problem, the following prerequisites are accepted: – the temperature regime in the lining and the underlying layer of the soil changes according to the damped harmonic function; – the thermal stress state of the cladding is affected by the creep of the concrete. As a result, the study of the kinetics of heat emission of cement during its hydration under various temperature conditions is mportant and necessary, especially for laying monolithic concrete in the lining of channels.