In the scope of this master's thesis we determined the adiabatic curve of massive concrete used in construction of Hydro power plant Brežice. Behavioral understanding of specific concrete components and their influences on development of temperature during concrete drying process was crucial for detailed analysis. For analysis purposes of temperature development in concrete drying process three different mixtures were used and measured during construction of HPP Brežice between August and December 2015. The mixture currently used for installation represented a reference for two other modified mixtures which we introduced with the purpose of minimizing the maximum temperature of hydration process. The first modified mixture contained a low percentage of cement. In the planning phase we assumed that installation of this mixture could represent a major problem, so we compiled a recipe for another adjusted mixture. This mixture contained a smaller amount of cement then the reference, but still higher then the first modified version. On the expense of reducing the quantity of cement we increased the number of fine particles to maintain best possible workability of concrete. After a detailed analysis of the data we obtained through experiments, we have found that reducing the amount of cement in concrete mixture has positive influence on the adiabatic curve. Blend with the minimum amount of cement has reached the minimum absolute temperature, minimum temperature rise and minimum relative temperature rise. This mixture has reached the minimum speed and accelerations of the temperature increase inside the concrete.