Effects of Long-Term Freeze–Thaw Cycles on the Properties of Stabilized/Solidified Lead-Zinc-Cadmium Composite-Contaminated Soil
Abstract
:1. Introduction
2. Materials and Methods
2.1. Material
2.1.1. Soil
2.1.2. Binders
2.1.3. Heavy Metals
2.2. Specimen Preparation
2.3. Testing Methods
2.3.1. Triaxial Compression Testing
2.3.2. Soil Column Leaching Test
2.3.3. X-ray Diffraction Analysis
3. Result
3.1. Mechanical Properties
3.1.1. Stress–Strain Relationship
3.1.2. Triaxial Compressive Strength
3.1.3. Indicators of Shear Strength
3.2. Leachability
3.3. Chemical Composition
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Physical Property Index | Liquid Limit/% | Plastic Limit/% | Plasticity Index (Ip) | Optimum Moisture Content/% | Maximum Dry Density/g/cm3 |
---|---|---|---|---|---|
Soil sample | 27.25 | 12.3 | 14.95 | 11.78 | 1.91 |
Chemical Components | CaO | MgO | SiO2 | Al2O3 | Fe2O3 | TiO3 | K2O | ZnO | CdO | PbO | Other |
---|---|---|---|---|---|---|---|---|---|---|---|
Contents (%) | 4.06 | 3.42 | 63.98 | 17.71 | 5.48 | 0.79 | 3.36 | ND | ND | ND | 1.2 |
Chemical Components | CaO | MgO | SiO2 | Al2O3 | Fe2O3 | TiO3 | K2O | SO3 | ZnO | CdO | Others |
---|---|---|---|---|---|---|---|---|---|---|---|
Cement (%) | 53.41 | 3.60 | 26.69 | 7.44 | 2.64 | 0.37 | 1.32 | 4.04 | 0.02 | 0.02 | 0.48 |
Lime (%) | 88.73 | 4.79 | 3.88 | 1.09 | 0.73 | 0.10 | 0.23 | 0.40 | ND | ND | 0.16 |
Fly ash (%) | 4.63 | 0.75 | 58.62 | 26.64 | 4.32 | 1.19 | 2.11 | 0.61 | 0.02 | ND | 1.08 |
Maximum Power | 18 kW |
---|---|
Tube voltage | 20–60 kV (1 kV/step) |
Tube current | 10–300 mA (1 mA/step) |
Stability | Within ± 0.01% |
Minimum stepping angle | 1°/1000 |
Minimum step | 1°/10,000 |
Set repeatability | 1°/10,000 |
Silt | Automatically variable slit |
F-T Cycles | Soil Column Length (cm) | Pore Water Velocity (cm/min) | (min) | (min) | (min) | D |
---|---|---|---|---|---|---|
0 | 20 | 0.0222 | 352 | 409.5 | 532 | 0.004874 |
3 | 20 | 0.0337 | 308 | 337.5 | 456 | 0.009231 |
7 | 20 | 0.0427 | 262 | 290.5 | 431.5 | 0.022540 |
14 | 20 | 0.0829 | 224 | 251 | 343 | 0.045466 |
30 | 20 | 0.1284 | 186 | 206 | 265 | 0.073590 |
90 | 20 | 0.1389 | 190 | 209 | 295 | 0.112985 |
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Yang, Z.; Chang, J.; Wang, Y.; Li, X.; Li, S. Effects of Long-Term Freeze–Thaw Cycles on the Properties of Stabilized/Solidified Lead-Zinc-Cadmium Composite-Contaminated Soil. Int. J. Environ. Res. Public Health 2021, 18, 6114. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph18116114
Yang Z, Chang J, Wang Y, Li X, Li S. Effects of Long-Term Freeze–Thaw Cycles on the Properties of Stabilized/Solidified Lead-Zinc-Cadmium Composite-Contaminated Soil. International Journal of Environmental Research and Public Health. 2021; 18(11):6114. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph18116114
Chicago/Turabian StyleYang, Zhongping, Jiazhuo Chang, Yao Wang, Xuyong Li, and Shu Li. 2021. "Effects of Long-Term Freeze–Thaw Cycles on the Properties of Stabilized/Solidified Lead-Zinc-Cadmium Composite-Contaminated Soil" International Journal of Environmental Research and Public Health 18, no. 11: 6114. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph18116114