ABSTRACT
Diameter and position of reinforcement in concrete structures are important para meters for the evaluation of the durability and the stability of building structures. A lot of samples are needed to assess the remaining life time and to determine the optimum date for the rehabilitation of a building structure. A reliable durability ana lysis can be yield only by nondestructive testing or semi-destructive testing methods. Even when detailed structural-drawings are available they often must be regarded as a useful tool by means of an additional information about the structure under inve stigation. Nondestructive control of the cover and size of reinforcement in addition to other testing parameters like, for example, the permeability of the concrete, immediately after construction may help to improve the durability of the building structure in an early stage.
