The service life of the concrete structures has taken a greater relevance in the last years. By means of this service, durability parameters can be obtained by laboratory tests. These parameters are introduced into analytical (e.g. EHE-08) or numerical models. The service life of any concrete structure may be calculated by specimens or cores extracted from existing structures. Also, the current state of existing structures can be evaluated on site by electrochemical techniques of corrosion and non destructive tests.