Effect of fly ash to slag ratio and Na2O content on leaching behaviour of fly Ash/Slag based alkali activated materials
Article
Srinivasamurthy, Lakshmikanth Lakshmikanth, Chevali, Venkata S., Zhang, Zuhua and Wang, Hao. 2023. "Effect of fly ash to slag ratio and Na2O content on leaching behaviour of fly Ash/Slag based alkali activated materials." Construction and Building Materials. 383. https://doi.org/10.1016/j.conbuildmat.2023.131234
Article Title | Effect of fly ash to slag ratio and Na2O content on leaching behaviour of fly Ash/Slag based alkali activated materials |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Srinivasamurthy, Lakshmikanth Lakshmikanth, Chevali, Venkata S., Zhang, Zuhua and Wang, Hao |
Journal Title | Construction and Building Materials |
Journal Citation | 383 |
Article Number | 131234 |
Number of Pages | 14 |
Year | 2023 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2023.131234 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0950061823009479 |
Abstract | Alkali–activated materials (AAMs) with variable levels of activator and precursor loading were evaluated for their long–term leaching behaviour. On a series of fly ash (FA)/slag–based binder mixes containing varying amounts of slag (0 – 30 wt%) and Na2O (5 – 9 wt%), 90–day leaching was conducted, and the resultant leaching products were characterized using X–ray diffraction, nuclear magnetic resonance 23Na and 27Al, and Fourier–transform infrared spectroscopy. The microstructural, mechanical, and physical properties of the samples were analysed as a function of the concentrations of activators and precursors. C–A–S–H and N–A–S–H gels were formed due to the inclusion of slag, which enhanced mechanical properties and decreased porosity. As the slag content in AAMs increased, the porosity decreased and the leaching ability of Na+ and Si4+ decreased. A long–term leaching process leached Ca2+ and Al[IV] from structural gels, including the N–A–S–H/C,N-A-S-H gel, and caused degradation with a corresponding decrease in compression strength and split tensile strength. |
Keywords | Alkali–activated materials; Durability; Efflorescence; Fly Ash; Slag; Leaching; Nuclear magnetic resonance spectroscopy |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Byline Affiliations | Centre for Future Materials |
MS Ramaiah Institute of Technology, India | |
Tongji University, China |
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