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Slag or Reacted Binder, Which Dissolves First in Sulphuric Acid?
https://orcid.org/http://orcid.org/0000-0003-1657-7800
https://orcid.org/http://orcid.org/0000-0001-9999-5236
https://orcid.org/http://orcid.org/0000-0003-4703-4876
https://orcid.org/http://orcid.org/0000-0001-9599-5466
https://orcid.org/http://orcid.org/0000-0002-2210-5394
To boost the usage of non-ferrous metallurgy slag (NFS) into alkali activating material (AAM), durability analysis of NFS-based AAM is needed. For this purpose, the dissolution behaviour of NFS-based AAM in sulphuric acid was investigated. In order to answer the question whether unreacted slag in the NFS-AAM structure is the weak part during acid exposure, dissolution experiments were conducted both on raw NFS and NFS-based AAM paste sample. The results suggested that both NFS and reacted binder dissolve in sulfuric acid. The dissolution of the raw NFS was, however, significantly faster and to a greater extent than that of the AAM paste. For the raw slag, almost all Si and Ca were detected in the solution, while about 80% Fe and Al were dissolved after exposure to sulphuric acid. The lower values, compared to Ca and Si, could be due to the undissolved crystal phases or precipitation. For pastes, 88% Ca, 79% Fe and 75% Al ended up in sulphuric acid solution, while only 60% of Si was dissolved. This corresponds approximately to 100% minus the reaction extent of the slag, suggesting low Si dissolution from the AAM binder. This can be explained by the presence of a highly polymerized silicate network with high acid resistance. The results confirm the importance of the slag structure and reacted amount of slag on the sulphuric acid resistance of NFS-AAM. The findings here are instrumental in providing solutions to improve sulphuric acid resistance of NFS-AAM.
Slag or Reacted Binder, Which Dissolves First in Sulphuric Acid?
https://orcid.org/http://orcid.org/0000-0003-1657-7800
https://orcid.org/http://orcid.org/0000-0001-9999-5236
https://orcid.org/http://orcid.org/0000-0003-4703-4876
https://orcid.org/http://orcid.org/0000-0001-9599-5466
https://orcid.org/http://orcid.org/0000-0002-2210-5394
To boost the usage of non-ferrous metallurgy slag (NFS) into alkali activating material (AAM), durability analysis of NFS-based AAM is needed. For this purpose, the dissolution behaviour of NFS-based AAM in sulphuric acid was investigated. In order to answer the question whether unreacted slag in the NFS-AAM structure is the weak part during acid exposure, dissolution experiments were conducted both on raw NFS and NFS-based AAM paste sample. The results suggested that both NFS and reacted binder dissolve in sulfuric acid. The dissolution of the raw NFS was, however, significantly faster and to a greater extent than that of the AAM paste. For the raw slag, almost all Si and Ca were detected in the solution, while about 80% Fe and Al were dissolved after exposure to sulphuric acid. The lower values, compared to Ca and Si, could be due to the undissolved crystal phases or precipitation. For pastes, 88% Ca, 79% Fe and 75% Al ended up in sulphuric acid solution, while only 60% of Si was dissolved. This corresponds approximately to 100% minus the reaction extent of the slag, suggesting low Si dissolution from the AAM binder. This can be explained by the presence of a highly polymerized silicate network with high acid resistance. The results confirm the importance of the slag structure and reacted amount of slag on the sulphuric acid resistance of NFS-AAM. The findings here are instrumental in providing solutions to improve sulphuric acid resistance of NFS-AAM.
Slag or Reacted Binder, Which Dissolves First in Sulphuric Acid?
https://orcid.org/http://orcid.org/0000-0003-1657-7800
https://orcid.org/http://orcid.org/0000-0001-9999-5236
https://orcid.org/http://orcid.org/0000-0003-4703-4876
https://orcid.org/http://orcid.org/0000-0001-9599-5466
https://orcid.org/http://orcid.org/0000-0002-2210-5394
To boost the usage of non-ferrous metallurgy slag (NFS) into alkali activating material (AAM), durability analysis of NFS-based AAM is needed. For this purpose, the dissolution behaviour of NFS-based AAM in sulphuric acid was investigated. In order to answer the question whether unreacted slag in the NFS-AAM structure is the weak part during acid exposure, dissolution experiments were conducted both on raw NFS and NFS-based AAM paste sample. The results suggested that both NFS and reacted binder dissolve in sulfuric acid. The dissolution of the raw NFS was, however, significantly faster and to a greater extent than that of the AAM paste. For the raw slag, almost all Si and Ca were detected in the solution, while about 80% Fe and Al were dissolved after exposure to sulphuric acid. The lower values, compared to Ca and Si, could be due to the undissolved crystal phases or precipitation. For pastes, 88% Ca, 79% Fe and 75% Al ended up in sulphuric acid solution, while only 60% of Si was dissolved. This corresponds approximately to 100% minus the reaction extent of the slag, suggesting low Si dissolution from the AAM binder. This can be explained by the presence of a highly polymerized silicate network with high acid resistance. The results confirm the importance of the slag structure and reacted amount of slag on the sulphuric acid resistance of NFS-AAM. The findings here are instrumental in providing solutions to improve sulphuric acid resistance of NFS-AAM.
Slag or Reacted Binder, Which Dissolves First in Sulphuric Acid?
RILEM Bookseries
Jędrzejewska, Agnieszka (editor) / Kanavaris, Fragkoulis (editor) / Azenha, Miguel (editor) / Benboudjema, Farid (editor) / Schlicke, Dirk (editor) / Wen, Nana (author) / Peys, Arne (author) / Hertel, Tobias (author) / Hallet, Vincent (author) / Pontikes, Yiannis (author)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
2023-06-11
8 pages
Article/Chapter (Book)
Electronic Resource
English
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