Integrated surface protection systems made of thermal-sprayed zinc coating and a sealing coating are being used to protect the reinforcement from corroding in chloride contaminated concrete. In this connection, the thermal-sprayed zinc coating should provide cathodic protection until the structure is mostly dried out even through the sealing coating. To detect the drying-out non destructive methods are required, which enable to measure the humidity profiles of the concrete. An easy and cost effective solution for that is the use of Multiring-electrodes. Resistance measurements between adjacent metal rings with defined distance and known location in the concrete cover enable a monitoring of moisture distribution inside the concrete, which is well known to be the main parameter for corrosion assessment. Beside the moisture content, the resistance is influenced by the concrete composition, the salt content, and the temperature. Based on measurements on concrete specimens of different compositions the influence of various parameters are shown, and by using of correlation functions the moisture distribution could be determined.

Subject
Zinc rich coatings, Water, Sensors, Composition, Correlation, Cathodic protection, Moisture, Concrete surfaces, Corrosion protection, Zinc, Chlorides, Drying, Concrete
Keywords:
Chloride Induced Corrosion, Moisture Content, Embedded Sensors
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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