Assessing the long-term chloride resistance of alkali-activated fly ash/slag concrete by natural chloride diffusion test and rapid chloride migration test
Article
Ma, Yuwei, Zhang, Jingxiao, Yang, Xiaocong, Yang, Zhihui, Zhang, Zuhua and Wang, Hao. 2025. "Assessing the long-term chloride resistance of alkali-activated fly ash/slag concrete by natural chloride diffusion test and rapid chloride migration test." Construction and Building Materials. 472. https://doi.org/10.1016/j.conbuildmat.2025.140823
Article Title | Assessing the long-term chloride resistance of alkali-activated fly ash/slag concrete by natural chloride diffusion test and rapid chloride migration test |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Ma, Yuwei, Zhang, Jingxiao, Yang, Xiaocong, Yang, Zhihui, Zhang, Zuhua and Wang, Hao |
Journal Title | Construction and Building Materials |
Journal Citation | 472 |
Article Number | 140823 |
Year | 2025 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2025.140823 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0950061825009717 |
Abstract | This paper evaluates the long-term chloride resistance of various alkali-activated fly ash/slag (AAFS) concrete, as determined by the natural chloride diffusion (NCD) test and rapid chloride migration (RCM) test, respectively. These concrete mixtures are expected to have wide practical applications, but there is limited research on their long-term chloride resistance at concrete scale. Particularly, the applicability and comparison of NCD and RCM tests on AAFS concrete have not been extensively addressed. The results reveal that AAFS concretes with pure slag (SL100), low w/b ratio (W40), and high Na2O content (N6) exhibit fluctuating compressive strength and chloride diffusion coefficient (Da) at later ages. Generally, a strong correlation exists between the Da and DRCM, affirming that the RCM test can effectively assess the chloride resistance of AAFS concretes. However, special attention should be devoted to AAFS with porous microstructures (SL30 and W50), as they exhibit greater discrepancy between DRCM and Da. The aging factor for chloride resistance in AAFS concretes ranges between 0.3 and 0.5, influenced by mixture proportions. The comparison of the aging factor suggests that the RCM results may underestimate the development of chloride resistance over time for AAFS concretes. |
Keywords | Aging factor; Alkali-activated materials; Compressive strength; Chloride diffusion coefficient; Natural chloride diffusion test; Rapid chloride migration test |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Guangzhou University, China |
Centre for Future Materials | |
Hong Kong Polytechnic University, China | |
Tongji University, China |
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