Czasopismo | OCHRONA PRZED KOROZJĄ | Rocznik 2013 - zeszyt 5

Studies on corrosion rate of reinforcement in reinforced concrete water tanks

nr katalogowy: 76448

Deterioration of internal linings in the reinforced concrete water tanks operated for over 20 years was observed which alarmed the construction supervisory authorities because of a potential risk of reinforcement corrosion and failure of the structure. Corrosion tests were undertaken to present the existing conditions of the reinforcement. The tests were performed on concrete cores cut out from the structures. The concrete cores which contained fragments of rebars, were placed in a corrosion chamber under precisely specifi ed thermal and humidity conditions. The average conditions existing in a tank fi lled with water and the conditions favourable for the development of corrosion process were simulated in the chamber. The test results demonstrated lack of any reasons for immediate closing down the facility and thus, it could be further operated while simultaneous works preparing the facility for major repair were conducted. Keywords: concrete structures, concrete, corrosion of reinforcement, polarization resistancemeasurements, impedance spectroscopy.1. Introduction During a periodical technical survey of two underground reinforced concrete tanks for potable water used for over 20 years which were situated in waterworks premises in a city in south-west part of Poland, few wall cracks and considerable wear of protective lining of concrete surfaces were found. Because of the potential risk of corrosion development in reinforcing steel and failure of the structure that could be caused by the observed deterioration, it was recommended to close down the tanks at once and perform immediately a very expensive major repair. The tanks were founded at a depth of ca. 7.0 m below ground level and covered with a reinforced concrete slab and initial backfi ll. The simultaneous closing down of both tanks was impossible because of the operational purposes, whereas beginning the major repair turned out to be diffi - cult on account of eco[...]

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