A Novel Model of Aggregate Gradation for Autoclaved Bricks from Tailings
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Preparation Methods
2.2.1. Experiment Design for Establishment of the Aggregate Gradation Model
2.2.2. Preparation of Autoclaved Bricks with Iron Ore Tailings
2.3. Measurements
3. Results and Discussion
3.1. Establishment of the Aggregate Gradation Model
3.2. Verification of the Gradation Design Model by Preparation of High-Strength Autoclaved Bricks with Iron Ore Tailings
Gradation Design
3.3. Characterization of the Autoclaved Bricks
3.3.1. Mechanical and Freezing Resistance Properties
3.3.2. XRD and SEM Analysis
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Composition (%) | Iron Ore Tailings | Barren Rocks |
---|---|---|
Na2O | 1.34 | 3.86 |
MgO | 9.70 | 3.95 |
Al2O3 | 9.41 | 13.09 |
SiO2 | 35.43 | 57.40 |
P2O5 | 0.76 | 0.27 |
K2O | 1.27 | 2.87 |
CaO | 13.01 | 6.84 |
TiO2 | 0.52 | 0.53 |
TFe | 6.22 | 4.19 |
BaO | 0.03 | 0.03 |
SO3 | 5.98 | 1.10 |
L.O.I | 13.05 | 3.41 |
Item | Particle Size over 0.074 mm (%) | Slaking Temperature (°C) | Slaking Time (min) | Content of Unbound CaO (%) |
---|---|---|---|---|
Index | 8.21 | 99 | 4.7 | 88.6 |
Size fraction (mm) | <0.074 | 0.074–0.15 | 0.15–0.45 | 0.45–0.9 | 0.9–1.2 | 1.2–2.5 |
Calculated aggregate (%) | 38.26 | 7.86 | 15.91 | 13.03 | 6.26 | 18.68 |
Adjusted aggregate (%) | 0 | 4.4 | 14.33 | 12.25 | 6.26 | 18.68 |
Item | Measured Value | Proposed Value |
---|---|---|
Compressive strength (MPa) | 30.14 | ≥25.0 |
Flexural strength (MPa) | 5.98 | ≥5.0 |
Compressive strength after 15 freezing–thawing cycles (MPa) | 26.52 | ≥20.0 |
Mass loss after 15 freezing–thawing cycles (%) | 0.74 | ≤2.0 |
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Zhang, T.; Zhao, Y.; Wang, W.; Yi, H.; Li, H.; Zhang, Q.; Song, S. A Novel Model of Aggregate Gradation for Autoclaved Bricks from Tailings. Minerals 2017, 7, 112. https://doi.org/10.3390/min7070112
Zhang T, Zhao Y, Wang W, Yi H, Li H, Zhang Q, Song S. A Novel Model of Aggregate Gradation for Autoclaved Bricks from Tailings. Minerals. 2017; 7(7):112. https://doi.org/10.3390/min7070112
Chicago/Turabian StyleZhang, Tingting, Yunliang Zhao, Wei Wang, Hao Yi, Hongqiang Li, Qiwu Zhang, and Shaoxian Song. 2017. "A Novel Model of Aggregate Gradation for Autoclaved Bricks from Tailings" Minerals 7, no. 7: 112. https://doi.org/10.3390/min7070112