Bond of steel-mortar interface interfered by stray current

Journal article (2021)

Authors

Zhipei Chen Materials and Environment - CEG , Beijing Jiaotong University
D.A. Koleva Materials and Environment - CEG
E. Schlangen Materials and Environment - CEG
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2021 Zhipei Chen, D.A. Koleva, E. Schlangen
DOI
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https://doi.org/10.1016/j.cemconres.2021.106591
Corrosion Stray current Bond strength Curing Electrochemical properties
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Published Date

2021

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

The focus of this work is to present test results on the bond of steel-mortar interface undergoing stray current. The bond strength, derived by pull-out tests, is correlated to the electrochemical response of the steel rebar and the properties of the mortar bulk matrix. The effects of curing regimes (in terms of duration of curing) and starting point of stray current are also investigated. It is found that stray current exerts bond degradation of the steel-mortar interface in all investigated cases, irrespective of the presence or absence of a corrodent (Cl−) in the external medium. For the ease of operation in lab tests, the stray current is generally simulated by anodic polarization, although fundamentally, the stray current effect on the steel surface is composed of both anodic and cathodic polarizations. Hence this work also differentiates the effects of stray current on steel-mortar bond, versus the effects of anodic polarization.