Print Email Facebook Twitter Reactions of self-healing agents and the chemical binding of aggressive ions in sea water Title Reactions of self-healing agents and the chemical binding of aggressive ions in sea water: Thermodynamics and kinetics Author Wu, Xintong (South China University of Technology) Huang, Haoliang (South China University of Technology; Guangdong Low Carbon Technologies Engineering Centre for Building Materials) Liu, Hao (South China University of Technology) Hu, Jie (South China University of Technology; Guangdong Low Carbon Technologies Engineering Centre for Building Materials) Wei, Jiangxiong (South China University of Technology; Guangdong Low Carbon Technologies Engineering Centre for Building Materials) Jiang, Zhengwu (Tongji University) Ye, G. (TU Delft Materials and Environment) Yu, Qijun (South China University of Technology; Guangdong Low Carbon Technologies Engineering Centre for Building Materials) Lothenbach, Barbara (Swiss Federal Laboratories for Materials Science and Technology (Empa)) Date 2021 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. Subject Cementitious materialsIon bindingMarine environmentSelf-healingThermodynamic modeling To reference this document use: http://resolver.tudelft.nl/uuid:c3c61846-0acb-41ca-9471-6c88ddc7c797 DOI https://doi.org/10.1016/j.cemconres.2021.106450 Embargo date 2023-05-03 ISSN 0008-8846 Source Cement and Concrete Research, 145, 1-13 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2021 Xintong Wu, Haoliang Huang, Hao Liu, Jie Hu, Jiangxiong Wei, Zhengwu Jiang, G. Ye, Qijun Yu, Barbara Lothenbach Files PDF CEMCON_2020_1198_R2.pdf 3.55 MB Close viewer /islandora/object/uuid:c3c61846-0acb-41ca-9471-6c88ddc7c797/datastream/OBJ/view