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Open AccessArticle

Value of Information (VoI) for the Chloride Content in Reinforced Concrete Bridges

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Department of Bridge Construction, FCP Fritsch, Chiari & Partner ZT GmbH, Marxergasse 1 B, 1030 Vienna, Austria
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Department of Civil Engineering and Natural Hazards, Institute for Structural Engineering, University of Natural Resources and Life Sciences, Peter-Jordan-Straße 82, A-1190 Vienna, Austria
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Department of Civil Engineering, Campus de Azurem, University of Minho, 4800-058 Guimaraes, Portugal
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(2), 567; https://doi.org/10.3390/app10020567
Received: 16 November 2019 / Revised: 30 December 2019 / Accepted: 6 January 2020 / Published: 13 January 2020
(This article belongs to the Special Issue Assessing and Extending the Service Life of Bridges)
The corrosion of reinforcement caused by chloride ingress significantly reduces the length of the service life of reinforced concrete bridges. Therefore, the condition of bridges is periodically inspected by specially trained engineers regarding the possible occurrence of reinforcement corrosion. Their main goal is to ensure that the structure can resist mechanical and environmental loads and offer a satisfactory level of safety and serviceability. In the course of assessment, measuring the chloride content, through which corrosion could be anticipated and prevented, presents a possible alternative to visual inspections and corrosion tests that can only indicate already existing corrosion. It is hard to determine the cost-effectiveness and actual value of chloride content measurements in a simple and straightforward way. Thus, the main aim of the paper was to study the value of newly gained information, which is obtained when a chloride content in reinforced concrete bridges is measured. This value was here analyzed through the pre-posterior analysis of the cost of measurement and repair, taking into account different types of exposure and material properties for a general case. The research focus was set on the initiation phase in which there are no visible damages. A relative comparison of costs is presented, where the cost of possible reactive/proactive repair was compared with the maximum cost of measurement, while the measurement is still cost effective. The analysis showed a high influence of the initial probability of depassivation on the maximum cost of the cost-effective measurement, as well as a nonreciprocal relation of the minimum cost of cost-effective reactive repair with the measurement accuracy. View Full-Text
Keywords: chloride ingress; value of information (VoI); pre-posterior analysis; chloride testing; corrosion; concrete repair; Bayesian statistics chloride ingress; value of information (VoI); pre-posterior analysis; chloride testing; corrosion; concrete repair; Bayesian statistics
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Zambon, I.; Santamaria Ariza, M.P.; Campos e Matos, J.; Strauss, A. Value of Information (VoI) for the Chloride Content in Reinforced Concrete Bridges. Appl. Sci. 2020, 10, 567.

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