Concrete for tidal power plant (on the 50th anniversary of the Kislogubskaya tidal power plant in the Arctic)

Introduction. The first experimental tidal power station in Russia has been operating in the Kislyaya Bay of the Barents Sea, Arctic Region, since December 1968. Constructed using float-on methods, it is recognized as an outstanding structure of the 20th century and has been designated as a “Monument of Science and Technology of the Russian Federation.” The paper discusses the research on frost resistance and corrosion resistance of monolithic concrete and reinforced concrete used in the tidal power plant. Aim. To summarize half a century of research and observations on reinforced concrete structures of this large facility and experimental samples of concrete and reinforced concrete in the harsh marine conditions of the Arctic. Materials and methods. High-strength, frost-resistant, and low-permeability concrete was utilized. The methodology involved laboratory and long-term field tests, including systematic inspections of the condition of concrete samples and reinforced concrete structures of the tidal power plant, with assessments of their strength and frost resistance. Results. The study demonstrated high frost resistance and corrosion resistance in the marine environment under prolonged exposure to low temperatures typical of the Arctic zone, ensuring the complete preservation of structures over 50 years of operation in harsh Arctic sea conditions, including tidal zones and ice impact. Conclusions. The findings confirm the feasibility of constructing and maintaining reinforced concrete structures for tidal power plantss in marine Arctic conditions without repair for an extended period (up to fifty years).