PENETRON Gets St. Petersburg Ship-Shape Again

Built to resist aggressive chemicals: The concrete in St. Petersburg is constantly exposed to attack from chlorides in saltwater. PENETRON crystalline technology provides a permanent solution.

We used a full range of PENETRON topical and admixture products to protect the new and renovated concrete structures during the renovation of the shipyard structures, including the concrete wharves, dry docks and other concrete elements.

Completed in July 2017, the newly renovated Admiralty Shipyards in St. Petersburg, Russia, employed PENETRON crystalline technology to counteract decades of corrosion and concrete decay from constant chloride penetration. The (now) waterproof and durable shipyards have already regained full functionality again.

Originally founded in 1704 by Peter the Great, the historic Admiralty Shipyards in St. Petersburg is one of the largest marine facilities in the country. Each shipyard is double the length of a football field at 12 m (39 feet) wide; about 50 m (165 feet) of the shipyard structures are submerged completely under water.

“This was a monumental construction and repair project that took years to complete,” explains Yevgeniya Kuzminova, Director of PENETRON St. Petersburg. “All new and repaired concrete exposed to the level of chloride penetration encountered in the shipyard required a permanent and durable solution.”

For any concrete structure exposed to such an aggressive marine environment, the main challenges to achieving a durable concrete matrix are attacks by aggressive chemicals such as chlorides, sulfates and acids, and corrosion of the reinforcement steel due to seawater penetration.

The active ingredients in PENETRON products react with concrete minerals to form insoluble crystals, which fill in cracks, pores and voids in concrete. The resulting crystalline network keeps seawater from penetrating into the concrete, even under high hydrostatic pressure, making the matrix impermeable to any chloride penetration. PENETRON-treated concrete reveals vastly improved chloride diffusion and sulfate resistance, as well as self-healing capabilities. In-situ testing has shown the service life of crystalline-enhanced concrete to be about three times that of…

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