Chloride ingress: modelling, sampling and predicting service life

Title: Chloride ingress: modelling, sampling and predicting service life
Author(s): P. Goltermann
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 753 - 760
Total Pages: 8
Nb references: 13
Language: English

Abstract: Most of the infrastructures (actually most structures at all) are built in reinforced concrete, due to its low price and good performance. The reinforced concrete is in many ways a perfect marriage between the reinforcement and the concrete, as the two materials supplement each others best sides in the structural performance. The concrete even ensures the corrosion protection of the reinforcement by means of a good, uncracked cover, just as the reinforcement help distributing eventual cracks and thus maintain the structural capacity.
However, as the structures are getting older the general experience is that an increased amount of money has to be used for their maintenance, often due to chloride induced corrosion. This paper are therefore taken a close look at the current sampling and prediction approach as the involved inaccuracies and variations lead to huge costs and also to an inefficient infrastructure management.
This paper present data from practice about the variations on chloride ingress and identify the resulting extreme uncertainties of the modelling of the chloride ingress and of the service life estimations. The variations are explained by combining simulations and test results. A new approach with chloride sampling combined with NDT-mapping and monitoring of corrosion is presented.

Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00