Influence of the microstructure of TMT reinforcing bars on their corrosion behavior in concrete with chlorides
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http://hdl.handle.net/10045/96167
Title: | Influence of the microstructure of TMT reinforcing bars on their corrosion behavior in concrete with chlorides |
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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). |
URI: | http://hdl.handle.net/10045/96167 |
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 |
Publisher version: | https://doi.org/10.1016/j.conbuildmat.2019.116899 |
Appears in Collections: | INV - BIMAEC - Artículos de Revistas INV - GRESMES - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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2019_Bautista_etal_ConsBuildMat_final.pdf | Versión final (acceso restringido) | 3,19 MB | Adobe PDF | Open Request a copy |
2019_Bautista_etal_ConsBuildMat_preprint.pdf | Preprint (acceso abierto) | 3,06 MB | Adobe PDF | Open Preview |
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