To read the full version of this content please select one of the options below:

Corrosion behavior of steel bar embedded in high-ductility cementitious composites under the coupled action of dry–wet cycles and chloride attack

Li-Ping Guo (School of Materials Science and Engineering, Southeast University, Nanjing, China)
Li-Juan Chai (School of Materials Science and Engineering, Southeast University, Nanjing, China)
Yan-Hui Xu (China Fortune Land Development Co., Ltd, Nanjing, China)
Cong Ding (School of Materials Science and Engineering, Southeast University, Nanjing, China)
Yuan-Zhang Cao (School of Materials Science and Engineering, Southeast University, Nanjing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 7 June 2021

Issue publication date: 2 July 2021

Downloads
41

Abstract

Purpose

High-ductility cementitious composites (HDCC) have an excellent crack controlled capacity and corrosion resistance capacity, which has a promising application in structure engineering under harsh environment. The purpose of this study is to explore the corrosion mechanism of steel bar in HDCC.

Design/methodology/approach

Intact and the pre-cracked HDCC specimens under the coupled action of different dry–wet cycles and chloride attack were designed, and intact normal concrete (NC) was also considered for comparison. Corrosion behavior of a steel bar embedded in HDCC was analyzed by an electrochemical method, a chloride permeability test and X-ray computed tomography.

Findings

Steel corrosion probability is related to the chloride permeability of the HDCC cover, and the chloride permeability resistance of HDCC is better than that of NC. Besides, crack is the key factor affecting the corrosion of steel bars, and the HDCC with narrower cracks have a lower corrosion rate. Slight pitting occurs at the crack tips. In addition, the self-healing products and corrosion products fill up the cracks in HDCC, preventing the external aggressive ions from entering and thereby decreasing the steel corrosion rate.

Originality/value

HDCC has a superior corrosion resistance than that of NC, effects of variable crack width on corrosion behavior of steel bar in HDCC under the coupled actions of different dry–wet cycles and chloride attack are investigated, which can provide the guide for the design application of HDCC material in structure engineering exposed to marine environment.

Keywords

Acknowledgements

The work was mainly supported by a National Natural Science Foundation of China (51778133).

Declarations of interest.The authors declare that they have no conflict of interest.

Citation

Guo, L.-P., Chai, L.-J., Xu, Y.-H., Ding, C. and Cao, Y.-Z. (2021), "Corrosion behavior of steel bar embedded in high-ductility cementitious composites under the coupled action of dry–wet cycles and chloride attack", Anti-Corrosion Methods and Materials, Vol. 68 No. 3, pp. 209-218. https://doi.org/10.1108/ACMM-07-2020-2346

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited