Corrosion mechanism and damage characteristic of steel fiber concrete under the effect of stray current and salt solution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Wenqiang Xu
  • Hanzhang Li
  • Kang Wang
  • Chengpeng Zhang
  • Yibo Jiang
  • Sheng Qiang

Detail(s)

Original languageEnglish
Article number125618
Journal / PublicationConstruction and Building Materials
Volume314
Issue numberPart A
Online published16 Nov 2021
Publication statusPublished - 3 Jan 2022
Externally publishedYes

Abstract

Steel fiber reinforced concrete (SFRC) has been widely used in construction and transportation due to its superior mechanical properties. From the perspective of structure, SFRC is a potential solution to the problem of stray current induced corrosion in electrical railway systems. However, the corrosion mechanism of SFRC under the coupling effect of stray current and salt solution is not clear, and the change of mechanical properties in the process still lacks a quantitative description, so it is difficult to predict the structural life. In this paper, different corrosive media were selected for the stray current induced corrosion test of SFRC, in which the chloride concentration was adjusted to study its influence on the corrosion rate. Ultrasonic and electric current were combined to monitor the corrosion process. The colorimetric and titration method were used to measure the chloride depth and concentration in the specimen after corrosion, mercury intrusion porosimetry was employed to determine the pore structure. It is found that chloride is the most destructive to SFRC and dominates the corrosion process, while sulfate and caustic alkali contribute secondary effect. Chloride destroyed the passive film on the surface of the steel fiber and corroded it to form a local rust expansion area, causing concrete damage and reducing mechanical properties. In addition, if the damage degree reaches 0.3 ∼ 0.4, the structure will be destroyed. When the environmental chloride concentration reaches the threshold 0.6 mol/L, the higher the concentration, the faster the SFRC corrosion. The quantitative relationship between the main influencing factors (concentration of chloride, corrosion time and chloride penetration depth) and damage degree is proposed based on the experimental data. The research may provide reference for the application of SFRC in electric railway projects.

© 2021 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Chloride ingress, Corrosion mechanism, Damage characteristic, Durability, Steel fiber reinforce concrete, Stray current

Bibliographic Note

Publisher Copyright: © 2021

Citation Format(s)

Corrosion mechanism and damage characteristic of steel fiber concrete under the effect of stray current and salt solution. / Xu, Wenqiang; Li, Yu; Li, Hanzhang et al.
In: Construction and Building Materials, Vol. 314, No. Part A, 125618, 03.01.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review