Polarization resistance of steel bar embedded in engineered cementitious composite under direct current exertion

Author(s): En-Hua Yang, Guanghui Zhang
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Electrochemistry in Civil Engineering
Editor(s): Lisbeth M. Ottosen
ISBN: 978-2-35158-176-6
e-ISBN: 978-2-35158-177-3
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 152-161
Total Pages: 10
Language : English

Abstract: The corrosion of steel bar in concrete structure has always been a serious issue compromising the durability of concrete structure because corrosion could reduce the cross section area of rebar, compromise the bond between rebar and concrete, and induce cover cracking. In recent years, Engineered Cementitious Composite (ECC) has been developed as a replacement of tradition concrete because of the advantages in high ductility, strain hardening effect, environmental friendliness, etc. However, the corrosion resistance performance of ECC has rarely been studied. Therefore, this paper covers an experimental study on the corrosion resistance of R/ECC system using linear polarization resistance (LPR) techniques. Steel rebars were embedded in two cylinders made up of Mortar and ECC. Corrosion process had been speeded up by applying direct current. The corrosion behavior of the steel rebar was monitored by LPR techniques periodically. The testing results obtained from LPR measurements indicated that the polarization resistance of ECC was larger and evolved slower than that of Mortar. The determination of instantaneous corrosion rate proved that ECC had slower corrosion processes than Mortar. This experiment provides quantitative evidence that ECC is superior to Mortar in terms of corrosion resistance.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00