Influence of the microstructure of TMT reinforcing bars on their corrosion behavior in concrete with chlorides

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Title: Influence of the microstructure of TMT reinforcing bars on their corrosion behavior in concrete with chlorides
Authors: Bautista, Asunción | Pomares Torres, Juan Carlos | González, María de las Nieves | Velasco, Francisco
Research Group/s: Grupo de Ensayo, Simulación y Modelización de Estructuras (GRESMES)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: Corrosion | Pitting | Chloride | Concrete | Thermomechanical treatment | Carbon steel | Galvanic coupling
Knowledge Area: Mecánica de Medios Continuos y Teoría de Estructuras
Issue Date: 30-Dec-2019
Publisher: Elsevier
Citation: Construction and Building Materials. 2019, 229: 116899. doi:10.1016/j.conbuildmat.2019.116899
Abstract: Thermomechanically treated (TMT) carbon steel bars, often known as TempCoreTM bars, are commonly used as reinforcements in concrete structures. TMT causes the formation of a martensite case in the outer surface of the bars, increasing their hardness, while the remaining ferritic-perlitic core maintains the typical ductility of hot rolled bars. In this work, the effect of this TMT induced microstructure on the development of pitting attacks in chloride media has been analyzed in depth. Electrochemical impedance spectroscopy (EIS) measurements and polarization curves have been carried out in simulated pore solutions to understand the effect of the presence of different phases in the microstructure and to quantify the strength of the galvanic couple that the outer martensite can form with the inner core. Moreover, accelerated corrosion tests in chloride contaminated concrete slabs have been performed. Bars from six different slabs where corrosive attack has been forced for different times have been studied. The shape of the main pits in the bars corroded in concrete has been analyzed through optoelectronic microscopy and the results obtained prove that the depth of the attack is related to the microstructure of the TMT bars.
Sponsor: The authors acknowledge the financial support of Interreg SUDOE, through KrEaTive Habitat project (grant Ref. SOE1/P1/E0307).
ISSN: 0950-0618 (Print) | 1879-0526 (Online)
DOI: 10.1016/j.conbuildmat.2019.116899
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Elsevier Ltd.
Peer Review: si
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Appears in Collections:INV - BIMAEC - Artículos de Revistas
INV - GRESMES - Artículos de Revistas

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