Abstract
AbstractReinforced concrete structures constitute the basis of our infrastructure. Their functionality and structural safety is essential to maintain our mobility and the industrial performance of our societies. Unexpected maintenance can lead to serious economic consequences. Most industrial countries are faced with the fact that the reliability of their infrastructure has decreased over the past decades due to ageing and associated durability issues. Most often reinforcement corrosion is the major problem with respect to ageing phenomena observed. Therefore, data from corrosion inspection and their implementation in probabilistic corrosion condition assessment are considered to be of major importance to assist engineers in the maintenance process. Reliable information about the corrosion condition state can be derived through half‐cell potential measurements. The half‐cell potential measurement method is an easy to apply nondestructive measurement method to detect ongoing corrosion. The procedure on how to update the service life based on a probabilistic treatment of measured half‐cell potentials is presented in a case study of a chloride‐contaminated reinforced concrete structure. Besides the chosen probabilistic model, major impact on the accuracy of the updated service life has the evaluation of the half‐cell potential measurements.
Highlights
Even though the used materials coped with the specifications of appropriate materials at the time of construction
Loss of cross section was found with up to 50% loss of steel cross sectional area. Both results of the chloride concentration and the visual examination of the reinforcement confirm the results of the probabilistic corrosion condition assessment
The reliability of the corrosion condition assessments depends besides the depassivation probability mainly on the reliability of the measurement method itself, in this case the half-cell potential measurement
Summary
Discussion on this paper must be submitted within two months of the print publication. The discussion will be published in print, along with the authors’ closure, if any, approximately nine months after the print publication. The consequence is that with time our ageing infrastructure shows more and more deterioration.[2]. Civil engineers need to ensure the structural safety and on the other hand, they need to extend the working life of our existing structures since we cannot replace all deteriorated structures within a short period of time. The knowledge about the actual structural condition allows a reliable prediction of the future evolution. In this framework, a case study presents the procedure of a reliable corrosion condition assessment of a tunnel structure contaminated over time by external chlorides. The focus is on the evaluation of actual condition with respect to durability during the residual service life
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