| Summary: | One of the effective methods of land irrigation in the Republic of Uzbekistan is carried out with the help of precast reinforced concrete trays of irrigation systems. In the process of operation, precast concrete trays are influenced by difficult operating conditions. As is known, to achieve high water resistance and concrete strength after heat treatment, it is necessary to take into account such factors as pre-exposure time, temperature rise rate, and isothermal warm-up time. However, the determining factor that has the greatest impact on the water resistance of concrete during heat treatment is the duration of the preliminary exposure and the rate of temperature rise, on which the values of internal stresses in concrete depend on heating. The paper gives the results of scientific research, which, being based on the studies of heat and moisture treatment of concrete in a laboratory steam chamber with automatic control of the regime. Scientific methods and techniques were used in the process of data processing and study findings: systematic approach, methods of system analysis and mathematical statistics. To determine the strength of concrete, cubic samples were made with dimensions of 100×100×100 mm, which were tested at the period of 1,3,7,28 days. After HMT compared with similar characteristics of normal hardening samples. The results of studies of the kinetics of increase in concrete strength depending on the heat treatment regimes are shown in the paper, that, despite the slight difference in the duration of the preliminary curing (1 and 2 hours), there is still a certain difference between them. The scientific novelty lies in the formulation, formalization and solving problems related to water resistance, frost resistance, and at the same time saves heat and power resources of trays.
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