Print Email Facebook Twitter Service life and life cycle cost modelling of cathodic protection systems for concrete structures Title Service life and life cycle cost modelling of cathodic protection systems for concrete structures Author Polder, R.B. Leegwater, G. Worm, D. Courage, W. Faculty Civil Engineering and Geosciences Department Structural Engineering Date 2012-06-18 Abstract Corrosion of reinforcing steel in concrete structures causes concrete cracking, steel diameter reduction and eventually loss of safety. In infrastructure this is mainly due to penetration of chloride ions from de-icing or marine salts. Conventional repair means heavy, labour intensive and costly work and economic pressures (time and money) work against the required quality level. Consequently, conventional repair is short lived in many cases in practice. Corrosion reappears quickly and the structure needs to be repaired again after a relatively short time, further increasing life-cycle cost. A completely different situation applies to cathodic protection (CP) of steel in concrete as a repair method. Cathodic protection of reinforcing steel has been applied successfully to concrete structures with corrosion damage for more than 25 years. This paper reports on past experience and presents a model for predicting life cycle costs for maintaining CP systems. Results will be presented from an inventory of CP systems in The Netherlands installed between 1987 and 2009 on about 150 structures, for which performance and maintenance data are reported. The large majority provides corrosion protection for a long time. Degradation of components and overall systems seems to occur in limited numbers. Failure of components and total systems as a function of age is quantified. On the average, the time until minor repairs of parts is necessary is about 15 years. Global failure of the anode, which necessitates near complete replacement of the system, is rare. Based on the statistical analysis of field data, the cost of maintaining a CP system is predicted using a life cycle cost model. Subject service lifecorrosioncathodic protectionlife cycle cost modelingexisting structures To reference this document use: http://resolver.tudelft.nl/uuid:23298884-2dd0-490d-a980-5c805b9107a7 Publisher Cembureau Source ICDC International congress on durability of concrete, Trondheim, Norway, 18-21 June 2012 Part of collection Institutional Repository Document type conference paper Rights (c) 2012 The Author(s)Cembureau Files PDF 289785.pdf 333.52 KB Close viewer /islandora/object/uuid:23298884-2dd0-490d-a980-5c805b9107a7/datastream/OBJ/view