Effect of Different NaOH Solution Concentrations on Mechanical Properties and Microstructure of Alkali-Activated Blast Furnace Ferronickel Slag
Abstract
:1. Introduction
2. Raw Materials and Test Methods
2.1. Raw Materials
2.2. Test Method
2.2.1. Compressive Strength
2.2.2. Isothermal Calorimetry
2.2.3. X-ray Diffraction (XRD)
2.2.4. Mercury Intrusion Porosimeter
2.2.5. ATR–FTIR Spectroscopy
3. Results and Discussion
3.1. Compressive Strength Development
3.2. Pore Structure of Hardened Pastes
3.3. Phase Compositions of Hardened Pastes
3.4. Isothermal Calorimetry
3.5. FT-IR Spectra of Hardened Pastes
4. Conclusions
- Optimal concentration on the compressive strength of mortars is found; 8 M NaOH shows the best performance. Both lower concentrations and higher concentrations cause strength degradation.
- The pore structure characterized by MIP indicates that at the low concentration (2M) more pore between 10 and 1000 nm is existed. This demonstrates the low compressive strength of 2M. The pore structure of 8M and 12M is similar which means the pore structure cannot explain the strength degradation at high concentration.
- The phase composition characterized by XRD reveals that less C-A-S-H gel is generated at low concentration and result in the poor pore structure. The low alkalinity of the 2M NaOH leads to lower reaction rate at the early age according to isothermal calorimetry result. Eventually, the amount of less C-A-S-H gel is generated.
- An increase in the concentration promotes the generation of C-A-S-H and hydrotalcite. According to XRD result, when the concentration is greater than 8 M, more hydrotalcite is formed compared to C-A-S-H. Isothermal calorimetry indicates that, the violent reaction at the early age hinders the later formation of the C-A-S-H. This causes the compressive strength degradation at high concentration.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Compound | CaO | SiO2 | Al2O3 | MgO | MnO | Cr2O3 | Fe2O3 | SO3 | LOI |
---|---|---|---|---|---|---|---|---|---|
BFFS | 32.72 | 27.31 | 21.82 | 8.64 | 1.99 | 1.95 | 1.57 | 1.58 | 2.41 |
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Huang, Z.; Zhou, Y.; Cui, Y. Effect of Different NaOH Solution Concentrations on Mechanical Properties and Microstructure of Alkali-Activated Blast Furnace Ferronickel Slag. Crystals 2021, 11, 1301. https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11111301
Huang Z, Zhou Y, Cui Y. Effect of Different NaOH Solution Concentrations on Mechanical Properties and Microstructure of Alkali-Activated Blast Furnace Ferronickel Slag. Crystals. 2021; 11(11):1301. https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11111301
Chicago/Turabian StyleHuang, Zongxian, Yuqi Zhou, and Yong Cui. 2021. "Effect of Different NaOH Solution Concentrations on Mechanical Properties and Microstructure of Alkali-Activated Blast Furnace Ferronickel Slag" Crystals 11, no. 11: 1301. https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11111301