Re-examining the suitability of high magnesium nickel slag as precursors for alkali-activated materials
Article
Article Title | Re-examining the suitability of high magnesium nickel slag as precursors for alkali-activated materials |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Yang, Tao, Zhang, Zuhua, Zhu, Huajun, Gao, Xuan, Dai, Chengdong and Wu, Qisheng |
Journal Title | Construction and Building Materials |
Journal Citation | 213, pp. 109-120 |
Number of Pages | 12 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2019.04.063 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0950061819308876#ak005 |
Abstract | High-magnesium nickel slag (HMNS) has shown the potential as precursor in the production of alkali-activated materials (AAMs). This study re-examines the suitability of HMNS by comparatively investigating the reactivity of four different sourced HMNSs and analyzing impacts of the magnesium sources in HMNS on the reaction products of AAMs. Results show that the cooling way plays a determinant role of their mineral compositions. The air-cooled HMNSs contain only ∼30 wt% glassy phases, while the water-quenched one is dominantly amorphous. The reactivity of HMNS determined by the dissolution tests correlates well with the calculated depolymerization degree of glasses. HMNS indeed exhibits lower reactivity than the precursors commonly used for AAMs production, such as fly ash and blast furnace slag. In the HMNS samples in the sodium hydroxide solution, M-S-H, C-S-H and hydrotalcite are the main reaction products. The OH− ions in the aqueous system react with Mg2+ to form the brucite, indicating that there is still a volume expansion risk if sodium hydroxide is used as activator. In comparison, only M-S-H and C-S-H gels are coexistent in the samples leached in the sodium silicate solution, because of the kinetic hindrance of soluble silicates for the formation of hydrotalcite and brucite. |
Keywords | High-magnesium nickel slag (HMNS), Alkali-activated cement, X-ray diffraction, Glass dissolution, Magnesium-silicate-hydrate (M-S-H) |
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 |
Hunan University, China | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) Grant ID (DE170101070 |
https://research.usq.edu.au/item/q586y/re-examining-the-suitability-of-high-magnesium-nickel-slag-as-precursors-for-alkali-activated-materials
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