Corrosion behavior of pre-rusted and pre-passivated steel in mortar

Title: Corrosion behavior of pre-rusted and pre-passivated steel in mortar
Author(s): Jingjie Shi, Wei Sun
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 535 - 543
Total Pages: 9
Nb references: 29
Language: English

Abstract: The influence of pre-rust and pre-passivation on the corrosion behavior of steel in mortar was investigated. Steel bars were pre-rusted and pre-passivated for 7d in 1wt%NaCl solution and saturated Ca(OH)2 solution, respectively. As-received steel bars were also used for a comparative purpose. Specimens were cast with steel bars embedded in ordinary Portland cement mortar, fly ash blended and silica fume blended mortar. Corrosion states of steel bars were measured by means of corrosion potential, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS). The results indicat that pre-rust and pre-passivation just have limited effect on the passivation-corrosion behaviour of steel in mortar specimens during the curing time (temperature of 20 0C and relative humidity above 95%). It was also noticed that steel may not be passivated within the curing time (90d). No adverse effect of pre-rust on the corrosion resistance of steel bars embedded in mortar specimens with supplementary cementitious materials (SCMs) has been found and pre-passivation may have minor beneficial effect on steel corrosion during the period of wetting-drying cycles in NaCl solution.

Online publication: 2011-04-20
Publication type : full_text
Public price (Euros): 0.00