Jaroslava Koťátková, Jan Zatloukal, Pavel Reiterman, Karel Kolář and Zbyněk Hlaváč
Cementitious materials are exposed to gamma irradiation in many areas such as the concrete structures in nuclear power plants, in medicine or as the cement composites and matrices in radioactive waste repositories. Pore water present in the cement paste undergoes radiolysis due to its interaction with gamma rays leading to dihydrogen production which is in case of a closed systems accumulated in the internal structure of cement paste leading to internal pressure increase. Such phenomenon may influence the material properties or worse if released into operational area it may pose a threat to safety. This article is a review of up to date knowledge, it describes the basic mechanisms controlling radiolysis, presents the main parameters affecting these mechanisms as well as the radiolysis impact on the material properties and ways how to reduce the negative effects of the process. It also addresses gaps in current knowledge and areas which should be in the focus of further research.
Radiolysis, dihydrogen generation, cementitious materials, gamma irradiation.