PSI - Issue 17

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 17 (2019) 268–275

ICSI 2019 The 3rd International Conference on Structural Integrity Corrosion and tensile behavior of 316L stainless steel concrete reinforcement in harsh environments containing a corrosion inhibitor S. Tsouli, A.G. Lekatou*, C. Nikolaidis, S. Kleftakis Laboratory of Applied Metallurgy, Department of Materials Science &Engineering, University of Ioannina, Ioannina 45110, Greece Abstract The electrochemical performance of 316L stainless steel rebars in a solution of pH~8 consisting of Ca(OH) 2 and fly ash (0-25 wt.% of the dry mixture) in an acid rain simulating solution was investigated by reverse polarization. Concrete cubes containing 0-25 wt.% fly ash and reinforced with 316L or 304L rebars were subjected to salt spraying. The salt spraying-due degradation of the rebars was studied by tensile testing. The beneficial effect of fly ash up to 20 wt.% content on the electrochemical behavior of 316L rebars is demonstrated. However, this trend is reversed at 25 wt.% FA. The tensile behaviour of 316L and 304L rebars after 2 m of salt spraying was not significantly affected by the fly ash presence. 316L and 304L embedded rebars performed similarly on tensile testing after salt spraying. ICSI 2019 The 3rd International Conference on Structural Integrity Corrosion and tensile behavior of 316L stainless steel concrete reinforcement in harsh environments containing a corrosion inhibitor S. Tsouli, A.G. Lekatou*, C. Nikolaidis, S. Kleftakis Laboratory of Applied Metallurgy, Department of Materials Science &Engineering, University of Ioannina, Ioannina 45110, Greece Abstract T e electrochemical p rformance of 316L stainless steel rebars in a solution of pH~8 consisting of Ca(OH) 2 and fly ash (0-25 wt.% f the dry mixture) in n aci ai simulat ng soluti n was investigat d by reverse polarizat on Concre e cubes containing 0-25 wt.% fly ash and reinforc with 316L or 304L rebars were subj ed to s lt spraying. The salt spraying-due deg adation of th rebars was studi d by tensile te ing. The beneficial effect of fly ash up to 0 content on the electrochemical beh vior of 316L ebars is demonstrated. However, thi trend is revers d at 25 wt.% FA. Th t sile behaviour of 316L an 304L rebars after 2 m of sa t spraying wa not significantly affected by the fly ash presence. 316L and 304L embedded rebars performed similarly on tensile testing after salt spraying.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: 316L stainless steel rebars; 304L stainless steel rebars; reinforced concrete; fly ash; acid rain; corrosion; tensile degradation Keywords: 316L stainless steel rebars; 304L stainless steel rebars; reinforced concrete; fly ash; acid rain; corrosion; tensile degradation

1. Introduction 1. Introduction

The high resistance of reinforced concrete against corrosion is attributed to the formation of a passive oxide film formed around the steel reinforcement, as a result of the high alkaline pore solution (pH  12.5 - 13.5). In that way, it prevents the penetration of aggressive agents, such as Cl - , CO 2 , acid species et al., through the concrete porous and subsequently the initiation of corrosion of the steel reinforcement (Mundra et al. (2017)). The high resistance of reinforced concrete against corrosion is attribut d to the formation of a passive oxide film formed around the steel reinforc ment, as a result of the high alkaline pore solution (pH  12.5 - 13.5). In that way, it prev nts the penetration of aggressive agents, such as Cl - , CO 2 , acid species et al., through the concrete porous and subsequently the initiation of corrosion of the steel reinforcement (Mundra et al. (2017)).

* Corresponding author. Tel.: (+30) 2651007309; fax: (+30) 2651007034. E-mail address: alekatou@cc.uoi.gr * Correspon ing author. Tel.: (+30) 2651007309; fax: (+30) 2651007034. E-mail address: alekatou@cc.uoi.gr

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.036