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37. Online corrosion monitoring and cathodic protection of a steel structure in concrete

Title: 37. Online corrosion monitoring and cathodic protection of a steel structure in concrete
Author(s): M. Brem, M. Büchler, I. Mailand
Paper category : conference
Book title: NUCPERF 2009 - Long Term Performance of Cementitious Barriers and Reinforced Concrete in Nuclear Power Plants and Waste Management
Editor(s): V. L'Hostis, R. Gens, C. Gallé
Print-ISBN: 978-2-35158-072-1
e-ISBN: 978-2-35158-087-5
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 335 - 342
Total Pages: 8
Nb references: 2
Language: English

Abstract: The demand to extend the service life of nuclear power plants requires measures to improve the long-term performance of reinforced concrete structures and steel structures.
In this case, corrosion of a steel structure clamped to a reinforced concrete structure is considered. The joint between the concrete and the steel structure is filled with rock wool.
During the first years of operation, water mixed with boric acid contaminated the concrete at the area of the joint. The boric acid decreased the alkalinity of the concrete in the interface of the concrete and the steel structure. This resulted in an acid attack causing corrosion at the interface where the steel was in contact with the concrete.

This paper presents the analysis performed to quantify corrosion by means of potential mapping.

The possible solutions to achieve a sufficient service life of the structure are discussed. The monitoring of the corrosion propagation with sensors for atmospheric corrosion and macro cell corrosion in concrete by means of an online monitoring is described. Furthermore the design of the cathodic protection system by means of numerical simulation and the protection obtained are described.

Online publication: 2009-11-16
Publication type : full_text
Public price (Euros): 0.00

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