A new representation of chloride threshold level for steel corrosion in concrete

Title: A new representation of chloride threshold level for steel corrosion in concrete
Author(s): M.S. Jung, H.B. Shim, S.-H. Kim, K.Y. Ann
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 605 - 612
Total Pages: 8
Nb references: 9
Language: English

Abstract: Chloride threshold level (CTL) for steel corrosion reflects the resistance of concrete matrix against chloride-induced corrosion in concrete. To represent CTL, the concentration of free chlorides, the molar ratio of [Cl-]:[OH-] and total chloride by weight of cement have been widely used to date. However, these representations impose the defect and limitation in describing the aggressive ness of chloride ions and inhibition effect of concrete in terms of cement hydration products. For free chloride and the ratio of [Cl-]:[OH-], the potential risk of bound chlorides in the corrosion process has been neglected, while total chloride content to cement weight does not consider the variation in the inhibition effect arising from different binder type. In this study, the relation between the CTL and acid neutralisation capacity (ANC) of cement hydration products was determined to assess the inhibition effect of cement hydration products against the onset of corrosion, using four different binders. As a result, it was found that an increase in the ANC resulted in increased CTL. Then, it was ensured that the molar ratio of total chloride for CTL to hydroxyl ions for ANC sustained a constant value, irrespective of binder type

Online publication: 2011-04-20
Publication type : full_text
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