期刊
CEMENT AND CONCRETE RESEARCH
卷 153, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2021.106691
关键词
Chloride binding; Friedel's salt; Kuzel's salt; pH; GEMS; Thermodynamic modelling
资金
- European Union's Horizon 2020 research and innovation programme [760639]
This study investigated the impact of different solutions on chloride ions in mortar specimens through immersion experiments. The results showed that the NaCl solution caused more leaching compared to the NaCl+KOH solution, and leaching significantly affected the penetration characteristics of chloride ions.
Mortar specimens were exposed to either a 3% NaCl solution or a 3% NaCl+KOH solution for up to 180 days. Exposure to the NaCl solution provoked much more leaching than the NaCl+KOH exposure. Leaching strongly impacted the chloride ingress profiles. The extended leaching led to a maximum total chloride content almost three times higher and a deeper chloride penetration than exposure with limited leaching after 180 days. The higher maximum chloride content seems to be linked to the enhanced binding capacity of the C-S-H and AFm phases upon moderate leaching as determined by SEM-EDS. The total chloride profile appears to be governed by multi-ion transport and the interaction of chloride with the hydration phases. Service life prediction and performance testing both rely on total chloride profiles and therefore ought to take these interactions into account.
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