Time to visual damage occurence on building facades due to reinforcement corrosion

Author(s): A. Köliö, J. Lahdensivu, M. Pentti
Paper category: Workshop
Book title: RILEM International workshop on performance-based specification and control of concrete durability
Editor(s): D. Bjegović, H. Beushausen, M. Serdar
ISBN: 978-2-35158-135-3
e-ISBN: 978-2-35158-136-0
Pages: 573 - 580
Total Pages: 8
Language: English

Visual corrosion damage has been observed in condition assessments conducted on concrete facades and balconies. The time it takes for corrosion to cause visual cracking of concrete was estimated using this condition assessment data from 947 buildings compiled into a database. The idea was to count backwards the time it has taken to generate corrosion cracks after the concrete surrounding the reinforcement has carbonated. There is, however, uncertainty related to the crack formation, subjectivity and statistical methods.
The cause for reinforcement corrosion in concrete facades is carbonation of the concrete cover. The age of buildings when visual damage was observed and the time of carbonation to the level of the reinforcement were given statistical distributions based on wide condition assessment data. The time of active corrosion was calculated based on these components with statistical simulation.
This information on carbonation induced corrosion can be utilized in the service life design of concrete structures and in determining the repair schedule of existing concrete structures in connection with condition assessment. Active corrosion time should be recognized as structure and exposure dependent in determining the residual service life and repair schedule of a structure.

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

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