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Corrosion monitoring systems for design verification - Application at the 36 km Hangzhou bay bridge

Author(s): M. Raupach, G. Weizhong
Paper category: Workshop
Book title: International RILEM Workshop on Integral Service Life Modelling of Concrete Structures
Editor(s): R.M. Ferreira, J. Gulikers, C. Andrade
Print ISBN: 978-2-35158-058-5
e-ISBN: 978-2-35158-090-5
Publisher: RILEM Publications SARL
Pages: 159 - 166
Total Pages: 8
Language: English

Since recent years durability of marine and coastal structures has become an important issue due to the problem of reinforcement corrosion. Several approaches have been developed to prevent the problems of corrosion of steel in concrete like stainless steels, epoxy-coated rebars, inhibitors or electrochemical methods like cathodic protection. However, for most large concrete structures exposed to sea water the following approach has been selected: The quality of the concrete cover has been increased as much as possible to achieve a maximum corrosion protection effect for the reinforcement by ensuring a high cover thickness (typically between 5 and 7 cm) and a concrete with a low chloride diffusion coefficient. During the design phase the required parameters for the concrete cover are determined using chloride diffusion models and assumptions for the chloride exposure. However, due to limitations of such calculations a verification of the design assumptions is an important task to be included into the management system for maintenance of the structure. For this purpose sensors can be installed to monitor the ingress of the critical chloride front into the concrete structure.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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