Structure formation of cement materials modified by sludges obtained after processing of chromium-containing solutions

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Abstract

The disposal of sludge containing barium chromate is an important task; however, if the disposal process allows one to obtain heavy concrete with an acceptable structure and properties for operation, then this task becomes very promising.. Compositions of concrete mix with sludge contentup to 20% of the liquid phase weight have been developed. It has been established that the specific effective activity of radionuclides in the sludge is 76 Bq/kg, i. e. it is suitable as a component of concrete. The processes of structure formation of these materials have been studied, starting with the characteristics of the workability of the sealed mixture, the physical properties of the mixture in the dynamics of structure formation, mechanical characteristics and ending with confirmation of the obtained results using scanning electron microscopy. All the developed compositions are characterized by workability capable of providing the standard workability of the concrete mix. The strengthening of the structure by almost a third is explained by the fact that, in addition to traditional calcium silicatehydrates СаО·SiO2·H2O, the packing of hydrated new formations is compacted due to the formation of high˗strengthBa2Al2O5·2H2Oparticles.

About the authors

A. A. Yudakov

Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences

Email: etcih@mail.ru
ORCID iD: 0000-0002-7264-2761
Doctor of Engineering Sciences Vladivostok, Russia

R. S. Fediuk

Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences; Far Eastern Federal University; Branch of the Federal State Budgetary Institution “CNIIP of the Ministry of Construction of Russia” Eastern Research, Design and Technological Institute for Construction

Email: roman44@yandex.ru
ORCID iD: 0000-0002-2279-1240
Doctor of Engineering Sciences, Professor Vladivostok, Russia; Vladivostok, Russia; Vladivostok, Russia

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