Effects of Mg-based admixtures on chloride diffusion in alkali-activated fly ash-slag mortars
Article
Zhang, Jingxiao, Ma, Yuwei, Zhang, Zuhua, Yang, Xiaocong, Nong, Xingzhong and Wang, Hao. 2024. "Effects of Mg-based admixtures on chloride diffusion in alkali-activated fly ash-slag mortars." Case Studies in Construction Materials. 21. https://doi.org/10.1016/j.cscm.2024.e03659
Article Title | Effects of Mg-based admixtures on chloride diffusion in alkali-activated fly ash-slag mortars |
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ERA Journal ID | 212014 |
Article Category | Article |
Authors | Zhang, Jingxiao, Ma, Yuwei, Zhang, Zuhua, Yang, Xiaocong, Nong, Xingzhong and Wang, Hao |
Journal Title | Case Studies in Construction Materials |
Journal Citation | 21 |
Article Number | e03659 |
Number of Pages | 14 |
Year | 2024 |
Publisher | Elsevier BV |
Place of Publication | Netherlands |
ISSN | 2214-5095 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cscm.2024.e03659 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S2214509524008106 |
Abstract | This study evaluated the effects of various Mg-based admixtures, including magnesium oxide (MgO), layered double hydroxides (LDH), and calcined layered double hydroxides (CLDH), on the chloride resistance of alkali-activated fly ash-slag (AAFS) mortars. To this end, chloride diffusion tests were conducted on AAFS mortars containing 5 wt% MgO, Mg-Al-CO3 LDH, and CLDH. The results revealed that all Mg-based admixtures investigated in this study enhanced the chloride resistance of AAFS mortars. The inclusion of MgO led to a finer pore structure and promoted the formation of more Friedel's salt, thereby enhancing the chloride resistance performance. Although the inclusion of Mg-Al-CO3 LDH and CLDH resulted in more lager pores in the matrix, leading to slightly lower compressive strength, the overall content of Mg-Al LDH and Friedel's salt formed in the system increased, which led to an improved chloride binding capacity and enhanced chloride resistance. |
Keywords | Alkali-activated materials; Magnesium oxide (MgO); Layered double hydroxides (LDH); Calcined layered double hydroxides (CLDH); Chloride diffusion |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Byline Affiliations | Guangzhou Metro Design and Research Institute, China |
Guangzhou University, China | |
Tongji University, China | |
Centre for Future Materials |
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https://research.usq.edu.au/item/z9q68/effects-of-mg-based-admixtures-on-chloride-diffusion-in-alkali-activated-fly-ash-slag-mortars
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