RT Journal Article
T1 Influence of the microstructure of TMT reinforcing bars on their corrosion behavior in concrete with chlorides
A1 Bautista Arija, María Asunción
A1 Pomares, Juan Carlos
A1 González García, M.N.
A1 Velasco López, Francisco Javier
AB 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.
PB Elsevier
SN 0950-0618
YR 2019
FD 2019-12-30
LK https://hdl.handle.net/10016/31724
UL https://hdl.handle.net/10016/31724
LA eng
NO The authors acknowledge the financial support of Interreg SUDOE, through KrEaTive Habitat project (grant Ref. SOE1/P1/E0307).
DS e-Archivo
RD 27 jul. 2024