Intrinsic sulfuric acid resistance of C-(N)-A-S-H and N-A-S-H gels produced by alkali-activation of synthetic calcium aluminosilicate precursors
Article
Wang, Yanru, Cao, Yubin, Zhang, Zuhua, Zhang, Peng, Ma, Yuwei, Wang, Aiguo and Wang, Hao. 2023. "Intrinsic sulfuric acid resistance of C-(N)-A-S-H and N-A-S-H gels produced by alkali-activation of synthetic calcium aluminosilicate precursors." Cement and Concrete Research. 165. https://doi.org/10.1016/j.cemconres.2022.107068
Article Title | Intrinsic sulfuric acid resistance of C-(N)-A-S-H and N-A-S-H gels produced by alkali-activation of synthetic calcium aluminosilicate precursors |
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ERA Journal ID | 4164 |
Article Category | Article |
Authors | Wang, Yanru, Cao, Yubin, Zhang, Zuhua, Zhang, Peng, Ma, Yuwei, Wang, Aiguo and Wang, Hao |
Journal Title | Cement and Concrete Research |
Journal Citation | 165 |
Article Number | 107068 |
Number of Pages | 14 |
Year | 2023 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0008-8846 |
1873-3948 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cemconres.2022.107068 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S000888462200360X |
Abstract | This study investigates the decomposition of alkali-activated materials (AAMs) in sulfuric acid solution. Four sodium-containing calcium aluminium-substituted silicate hydrate (C-(N)-A-S-H) and aluminosilicate hydrate (N-A-S-H) gels with designed Ca/Si and Si/Al ratios are produced with synthetic calcium aluminosilicate powders. The formation of additional calcium products in Ca-rich and Al-sufficient sample is likely helpful to retard the attack of sulfuric acid on the C-(N)-A-S-H/N-A-S-H gels. The Sisingle bondO bond strength of N-A-S-H gel appears weaker than that of C-(N)-A-S-H gel. The calcium in the gels prevents the leaching of silicon from gels. The length of silicon chains in the C-(N)-A-S-H gel increases with increased Si/Al ratio while exposure to acid solution. The chain length of the N-A-S-H gel increases with reduced Si/Al ratio. C-(N)-A-S-H gels show a higher resistance to leaching than N-A-S-H gel, while the latter has a high resistance to depolymerization under acid attack. This study provides a basic route to understand the effect of AAMs composition on acid resistance. |
Keywords | Acid degradation; Alkali-activation ; C-(N)-A-S-H ; Durability; N-A-S-H |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Future Materials |
Tongji University, China | |
Qingdao University of Technology, China | |
Guangzhou University, China | |
Anhui Jianzhu University, China |
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https://research.usq.edu.au/item/z2718/intrinsic-sulfuric-acid-resistance-of-c-n-a-s-h-and-n-a-s-h-gels-produced-by-alkali-activation-of-synthetic-calcium-aluminosilicate-precursors
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