Assessment of the performance of alkali-activated slag/fly ash using liquid and solid activators: early-age properties and efflorescence
Article
Gong, Jihao, Ma, Yuwei, Wang, Yanru, Cao, Yubin, Fu, Jiyang and Wang, Hao. 2024. "Assessment of the performance of alkali-activated slag/fly ash using liquid and solid activators: early-age properties and efflorescence." Journal of Sustainable Cement-Based Materials. 13 (2), pp. 300-310. https://doi.org/10.1080/21650373.2023.2266837
Article Title | Assessment of the performance of alkali-activated slag/fly ash using liquid and solid activators: early-age properties and efflorescence |
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ERA Journal ID | 201155 |
Article Category | Article |
Authors | Gong, Jihao, Ma, Yuwei, Wang, Yanru, Cao, Yubin, Fu, Jiyang and Wang, Hao |
Journal Title | Journal of Sustainable Cement-Based Materials |
Journal Citation | 13 (2), pp. 300-310 |
Number of Pages | 11 |
Year | 2024 |
Publisher | Taylor & Francis |
Place of Publication | United Kingdom |
ISSN | 2165-0373 |
2165-0381 | |
Digital Object Identifier (DOI) | https://doi.org/10.1080/21650373.2023.2266837 |
Web Address (URL) | https://www.tandfonline.com/doi/abs/10.1080/21650373.2023.2266837 |
Abstract | The use of solid activators to prepare alkali-activated materials (AAM) holds great potential for on-site applications, as it eliminates the need to transport and store large quantities of concentrated alkaline solutions. This study compared the early-age properties and efflorescence between alkali-activated slag/fly ash (AASF) using solid and liquid sodium silicates as activators. The results revealed that AASF with solid sodium silicates exhibited comparable mechanical strength while possessing reduced initial setting time and flowability. All AASF mixtures were susceptible to efflorescence and carbonation, resulting in varying mineralogical compositions of carbonation products: Vaterite was detected in AASF with solid activators, while aragonite and pirssonite were identified in AASF with liquid activators containing 4 and 6 wt.% Na2O, respectively. The efflorescence of AASF exposed to bottom water was more severe than those exposed to natural conditions, as evidenced by the decalcification of reaction products, migration of alkalis, and formation of crystalline carbonates. |
Keywords | Alkali-activated materials; sodium silicates; setting time; efflorescence |
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 | |
School of Engineering |
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