Chloride Thresholds for Stainless Steel Rebars

Author(s): J. Sanchez, A. Pachon, C. Andrade, J. Fullea and V. Matres
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 375-384
Total Pages: 10
Language : English

Abstract: The high resistance of the stainless steel to corrosion has aroused the interest for its use as corrugated stainless reinforcement. There are different grades of stainless steel with different behaviour against chloride corrosion. Chlorides threshold necessary for depassivation of stainless steel grades are not established in any standard. Moreover, the results of other researchers provide very general assessments. This investigation analyses the five most commonly used types of stainless steels as reinforcement: two classic austenitic: EN 1.4307 (AISI 304-L) and EN 1.4404(AISI 316-L) and three duplex steels: EN 1.4362(2304), EN 1.4482(2001) and EN 1.4462(2205). The accelerated integral method is applied for determine stainless steel corrosion resistance as described in standard UNE-EN 83992-2. This methodology has been modified to avoid rebars polarization during the test. Results provide us a relation between chlorides concentration, close to reinforcement, and corrosion rate. Based on these results we can obtain critic chloride thresholds which trigger severe corrosion for a 10% or 50% of probabilities and a law for chlorides concentration and corrosion rate.

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00

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