A condition monitoring system for corrosion and stray current monitoring is being supplied and installed into the new metro line in Copenhagen known as the Cityringen project.

The objective of the system is to provide a combination of:

  1. Pre-warning system for corrosion occurring within the concrete cover so as to spot the onset of corrosion at reinforcement depth using a number of anode ladder sensors and electrical resistance (ER) sensors.

  2. To understand the areas of stray current flow through the tunnel and station walls through the use of sense electrode sensors.

The data will be used to refine the uncertainties and assumptions in service life model predictions of concrete durabilities developed prior to the structure design1.

This paper describes the implementation of the monitoring system and the design consideration/philosophy used when determining measurement location throughout the system and the challenges presented and overcome.

Subject
Steel structures, Sensors, Corrosion rate, Probes, Structures, Installation, Steel, Stray current, Corrosion probes, Tunnels, Chlorides, Electrodes, Concrete
Keywords:
corrosion in concrete, corrosion monitoring, stray current
© 2016 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. 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).
2016
Association for Materials Protection and Performance (AMPP)
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