Reactions of self-healing agents and the chemical binding of aggressive ions in sea water: Thermodynamics and kinetics

Xintong Wu, Haoliang Huang*, Hao Liu, Jie Hu, Jiangxiong Wei, Zhengwu Jiang, Guang Ye, Qijun Yu, Barbara Lothenbach

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

New self-healing agents that can chemically bind seawater ions invading cracked cementitious materials were proposed. The potential of self-healing and binding of seawater ions were investigated by thermodynamic modeling. It was found that CaO-NaAlO2 and CaO-metakaolin agents can have Cl, SO42− and Mg2+ chemically bound by reacting with sea water to form Friedel's salt, Kuzel's salt, ettringite and hydrotalcite. The removal of Cl from seawater firstly increased and then decreased with the increase of Ca/Al molar ratio in both agents, while the removal of Mg2+ and SO42− were hardly influenced and approximated 100%. Because NaAlO2 dissolves and releases Al(OH)4 rapidly, precipitates binding Cl, SO42− and Mg2+ were formed fast. In comparison, the reaction of metakaolin binding aggressive ions occurred after 3 days. Because of the faster reaction and the capacity to make [Cl]/[OH] lower in the solution, CaO-NaAlO2 would be more efficient for self-healing and mitigating reinforcement corrossion than CaO-metakaolin.

Original languageEnglish
Article number106450
Pages (from-to)1-13
Number of pages13
JournalCement and Concrete Research
Volume145
DOIs
Publication statusPublished - 2021

Bibliographical note

Accepted Author Manuscript

Keywords

  • Cementitious materials
  • Ion binding
  • Marine environment
  • Self-healing
  • Thermodynamic modeling

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