Geopolymer with improved thermal stability by incorporating high-magnesium nickel slag
Article
Article Title | Geopolymer with improved thermal stability by incorporating high-magnesium nickel slag |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Yang, Tao (Author), Wu, Qisheng (Author), Zhu, Huajun (Author) and Zhang, Zuhua (Author) |
Journal Title | Construction and Building Materials |
Journal Citation | 155, pp. 475-484 |
Number of Pages | 10 |
Year | 2017 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2017.08.081 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0950061817316744#! |
Abstract | The present study investigates the thermal stability of binary geopolymers prepared with fly ash and high magnesium nickel slag (HMNS). TGA, XRD and SEM techniques are adopted to investigate the chemical composition and microstructure of the binder gel phase exposed to high temperatures. The results show that incorporating HMNS mitigates dehydration induced mass loss and volume shrinkage of the geopolymer samples between room temperature and 250 °C, and increases their residual strengths when exposed to high temperatures between 600 °C and 800 °C. The key role that HMNS substitution of improving the thermal stability of geopolymers is associated with the formation of sodium alumina(magnesia)-silica hydrate (N-A(M)-S-H) gel phase, which turns to be a less porous microstructure after thermal exposure when compared with the N-A-S-H gel phase, which is formed in the pure fly ash sample. The binary geopolymers exhibit higher residual strengths and better maintaining of volume stability in the range from 250 °C to 550 °C compared to Portland cements. However, both the geopolymer and Portland cement show severer volume shrinkage after exposure of 600 °C, because of the viscous sintering of geopolymer gels and the decomposition of cement hydration products, respectively. |
Keywords | Geopolymer; Nickel slag; Fly ash; Thermal stability |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Yancheng Institute of Technology, China |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) Grant ID DE170101070 |
https://research.usq.edu.au/item/q5878/geopolymer-with-improved-thermal-stability-by-incorporating-high-magnesium-nickel-slag
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