The change of air permeability of concrete in time

Hennadii Farenyuk, Yurij Nemchinov, Andrii Bambura, Leonid Sheinich, Maksym Mykolaiets, Mykola Mudryk


The air permeability of heavy concrete is an important indicator and its value is normalized with the application of concrete in protective shells of nuclear power plants. The critical value of the air permeability index of concrete is determined from the condition of the permissible velocity of air flowing through the shell in the design basis accident. Today, this value is achieved mainly due to constructive solutions in the design of the protective shell.The article presents the results of research on the compliance of concrete with the established requirements for its air permeability for a comprehensive justification for further safe operation of nuclear power plants for 25 years after the achievement of the project life (30 years).To obtain the necessary indicators for calculations, a model composition of concrete was designed so that it corresponded to real concrete of nuclear power plant protective shells from which the specimens were made. A comparative study of air permeability of concrete at different age were made, such as concrete at the age of 28 days simulating the composition of concrete used in the construction of the nuclear power plant, and concrete at the age of 35 years selected from the protective shell of the nuclear power plant.The air permeability of concrete at the age of 28 days does not meet the requirements of safe operation of nuclear power plants. At the same time, it was established that concrete selected from the protective shell, meets the requirements for the safety of operation of the nuclear power plants. The obtained results are explained by the processes of compacting the concrete in time.


nuclear power plant; concrete; air permeability; structure; cement stone


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