Suitability of portable electrochemical techniques for determinationof corrosion stage of concrete structures in on-site conditions

摘要

Within several EU-Projects different monitoring systems have been evaluated regardingtheir suitability for reduction of the inspection and maintenance costs as well as the trafficimpairments.They partially dealt with portable techniques for assessment of reinforcement corrosion. Duringthis work potential field mapping and a portable equipment based on the galvanostatic pulsemethod (GPM) were tested and compared in different situations at laboratory and on-site conditions.This paper presents results and analysis of the GPM measurements performed in laboratory andon-site conditions in comparison to results of potential mapping. Additionally results of averagecorrosion rates determined by weight loss and galvanostatic pulse technique were compared.Special attention was paid to the comparability of instrument readings to real behavior. Finallythe necessary precautions which need to be taken when the on site data are used for service lifeprediction of structures are discussed considering environmental and technical effects.