Strength Characteristics of Iron Tailings Blended Soil as a Road Base Material
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Test Methods
3. Results and Discussion
3.1. Unconfined Compressive Strength
3.1.1. Influence of Iron Tailing Sand Content
3.1.2. Influence of Cement Content
3.1.3. Influence of Soil Curing Agent Content
3.1.4. Influence of Water Content
3.1.5. Water Stability
3.2. Splitting Strength and Flexural-Tensile Strength
3.3. Mineral Compositions Affected by Additive Agents
3.4. Microstructures Affected by Additive Agents
3.5. Microstructures Affected by Iron Tailing Sand Content
4. Conclusions
- Considering both economy and practical implications, the optimal mix proportion of ITBS is determined as follows, ITS:soil = 50%:50%, and then mixed with 5% cement and 2% soil curing agent in total weight of ITS and soil.
- Under the optimum mix proportion conditions, the compressive strength of ITBS can be effectively exerted when the water content is about 12%. The samples of standard curing and soaking curing increase gradually with the increase of age, and the samples under the condition of long-term soaking curing still have high strength assurance rate, and the ITBS has good water stability.
- The splitting strength and flexural tensile strength of the mixture also increase with the increase of age and increase first and then decrease with the increase of the sand to soil ratio.
- The XRD and SEM results show that the addition of curing agent yielded almost no new substances but the ion exchange reaction between curing agent and soil could occur, which made the aggregate more compact. C-S-H gel and CaCO3 were produced in the mixed soil due to hydration of cement. These substances filled the pores of aggregate and made the bond between ITS and soil particles more compact and the strength further increased. Using the curing agent in conjunction with the cement can generate a higher strength. In addition, when the contents of the soil and ITS are equal, the combination between the two components is getting closer.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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SiO2 | Fe2O3 | Al2O3 | MgO | CaO | K2O | Na2O | P2O5 | Others |
---|---|---|---|---|---|---|---|---|
70.82 | 13.66 | 5.08 | 4.55 | 3.48 | 0.92 | 0.64 | 0.31 | 0.54 |
Liquid Limit | Plastic Limit | Plastic Index Ip | Optimum Water Content | Dry Density |
---|---|---|---|---|
39.6% | 20.8% | 18.8 | 14.5% | 1.83 g/cm3 |
Parameter | Value or Description |
---|---|
Component | A by-product of the citrus industry |
Color | Black, dark amber |
State | Liquid |
Density | 1.70 g/cm3 |
Solubility | Completely soluble in water |
Odor | Sharp sulfurous smell |
ITS Content (%) | Cement Content (%) | Curing Agent (%) | Water Content (%) |
---|---|---|---|
30, 40, 50, 60, 70 | 0, 1, 2, 3, 4, 5 | 0, 0.5, 1, 1.5, 2 | 8, 10, 12, 14, 16 |
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Tong, J.; Niu, X.; Wang, Y.; Lu, Y. Strength Characteristics of Iron Tailings Blended Soil as a Road Base Material. Appl. Sci. 2021, 11, 7587. https://doi.org/10.3390/app11167587
Tong J, Niu X, Wang Y, Lu Y. Strength Characteristics of Iron Tailings Blended Soil as a Road Base Material. Applied Sciences. 2021; 11(16):7587. https://doi.org/10.3390/app11167587
Chicago/Turabian StyleTong, Jiannan, Xujing Niu, Yonghua Wang, and Yunhua Lu. 2021. "Strength Characteristics of Iron Tailings Blended Soil as a Road Base Material" Applied Sciences 11, no. 16: 7587. https://doi.org/10.3390/app11167587