ABSTRACT
Durability prognosis of reinforced concrete structures especially if exposed to aggressive environmental im-pact, such as bridges, car parks, off-shore structures, needs permanent or from-time-to-time information on certain condition parameters of relevant structural members. A very important information is, where and to which depth corrosion inducing substances have been penetrated into concrete cover of reinforcement or if corrosion has already started to proceed. The availability of suited measurement devices for such purposes is very limited.
In this contribution, the development and testing towards prototype status of a new, compact, wireless and ro-bust corrosion sensor is reported. This sensor can be integrated into the cover-layer of reinforced concrete structures. Due to the chosen compact geometry of the sensor it is possible to detect the progress of the depassivation-front in staggered intervals of depth (e.g. due to carbonation or critical chloride concentration). The sensor can be applied both to new-built and to existing structures as well. For latter purpose a main problem which has to be solved is, how to install the sensor into boreholes without any defects of coupling by help of bonding and without influencing the corrosion inducing transport phenomena. Suited mortars and application methods for different mounting conditions have to be found and a quality assuring system to avoid the formation of voids during installation has to be developed.
