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Concrete constructions are normally reinforced with steel, which is protected by high alkalinity of the concrete against the effects of corrosion. The steel reinforcement corrosion is causing by the reducing the alkalinity of the concrete or by the presence of chlorides in such an aggressive environment which make reduction the cross-sectional area of the reinforcement and a loss of cohesion. Underground constructions are often found in an aggressive rock environment and the protection of steel reinforcement is mo...