Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete
Abstract
:1. Introduction
2. Experiment
2.1. Raw Materials
2.2. Specimen Preparation
2.2.1. Preparation of Mortar Specimen
2.2.2. Preparation of Concrete Specimen
2.3. Test Method
3. Results and Discussion
3.1. Mechanical Properties of ISD System
3.1.1. Effect of Steel Slag Doping Ratio on Mechanical Properties
3.1.2. Effect of Iron Tailings Doping Ratio on Mechanical Properties
3.2. Effect of Chemical Activator on the ISD System
3.2.1. Mechanical Properties
3.2.2. Thermal Analysis
3.3. Compressive Strength of ISD Admixture Concrete
3.4. Compressive Mercury Analysis
3.5. Microstructure Analysis
4. Conclusions
- The 7 d and 28 d compressive strengths of an ISD admixture are significantly higher than those of an iron tailings single admixture. With the increase in the proportion of steel slag admixture, the pre-strength of the ISD admixture grows first and then decreases. The 7 d and 28 d compressive strengths of the ISD admixture showed a trend of increasing and then decreasing with the increase in the proportion of iron tailings. The 7 d and 28 d compressive strengths of the ISD system reached 24.9 MPa and 36.1 MPa, respectively, when the ratio of iron tailings:steel slag:desulfurization ash = 1:1:1.
- The appropriate amount of Na2SiO3 can promote the early strength growth of an ISD admixture and also inhibit the later strength of an ISD admixture. Na2SiO3 is suitable for the early strength agent of an ISD admixture, but the amount of admixture should not exceed 0.6% of the admixture. Na2SiO3 is used to improve the early strength of the ISD system by promoting the consumption of Ca(OH)2 in the ISD system to produce C-S-H. However, in the late reaction of the ISD system, Na2SiO3 inhibits the late strength development of the ISD system by inhibiting Ca(OH)2 production.
- An ISD admixture will cause the early strength of concrete to decrease. The late strength of concrete can also be reduced when ISD is mixed in excessive amounts. Concrete with ISD dosing of 30% or less meets C40 requirements.
- The strength of ISD concrete is influenced by the total pore volume, and the total pore volume of ISD concrete increases with the increase in ISD admixture. ISD will provide a filler effect to concrete, but it will also cause a reduction in the active reactants of concrete, and the combined effect of a microfill effect and an active effect affects the strength development of ISD concrete.
5. Recommendations
- Since the water-to-cement ratio can seriously affect the workability of cement mortar and the performance of concrete, further studies on the effect of water-to-cement ratio on the performance of ISD concrete are needed.
- If increasing the amount of ISD in concrete will further improve the economic value of ISD concrete, it is necessary to further investigate the performance of high-dosage ISD concrete.
- Durability is an important property of concrete, and it is necessary to study the durability of ISD concrete, such as impermeability and resistance to sulfate attack.
- Admixtures can significantly improve the performance of concrete, and further research is needed to investigate the admixtures suitable for ISD concrete.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
References
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Ingredients | Iron Tailings | Steel Slag | Desulfurization Ash |
---|---|---|---|
SiO2 | 66.26 | 15.20 | 1.47 |
Al2O3 | 4.78 | 2.53 | 1.14 |
Fe2O3 | 14.37 | 27.54 | 0.44 |
MgO | 6.33 | 6.05 | 2.00 |
CaO | 7.77 | 42.65 | 93.85 |
SO3 | 0.48 | 0.12 | 0.19 |
Number | Raw Materials | Cement Replacement Rate and Proportioning | Solid Waste/g | Cement/g | Standard Sand/g | Water/g |
---|---|---|---|---|---|---|
C | Cement | 100% | 0 | 450 | 1350 | 225 |
I-1 | Iron Tailings | 30% | 135 | 315 | ||
ISD-1 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (4:1:3) | ||||
ISD-2 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (2:1:1) | ||||
ISD-3 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (4:3:1) | ||||
ISD-4 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:1:1) | ||||
ISD-5 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:2:2) |
Number | Raw Materials | Cement Replacement Rate and Proportioning | Na2SiO3 Doping/% | Solid Waste/g | Cement/g | Standard Sand/g | Water/g |
---|---|---|---|---|---|---|---|
ISD-5 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:2:2) | 0 | ||||
ISD-5-S1 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:2:2) | 0.4 | 135 | 315 | 1350 | 225 |
ISD-5-S2 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:2:2) | 0.6 | ||||
ISD-5-S3 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:2:2) | 0.8 | ||||
ISD-5-S4 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:2:2) | 1.0 | ||||
ISD-5-S5 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:2:2) | 1.2 |
Number | Raw Materials | Cement Replacement Rate and Proportioning | Cement/g | Iron Tailing Waste Rock/g | Iron Tailing Sand/g | Water Reducing Agent/g | Water/g |
---|---|---|---|---|---|---|---|
CC-1 | Iron Tailings–Steel Slag–Desulfurization Ash | 0% (1:2:2) | 420 | 1110 | 740 | 4.5 | 185 |
ISDC-1 | Iron Tailings–Steel Slag–Desulfurization Ash | 10% (1:2:2) | 378 | ||||
ISDC-2 | Iron Tailings–Steel Slag–Desulfurization Ash | 20% (1:2:2) | 336 | ||||
ISDC-3 | Iron Tailings–Steel Slag–Desulfurization Ash | 30% (1:2:2) | 294 |
Number | Age/d | H2O/mg | Ca(OH)2/mg |
---|---|---|---|
ISD-5 | 7 | 0.8 | 2.67 |
ISD-5-S2 | 7 | 0.84 | 1.72 |
ISD-5 | 28 | 0.9 | 2.05 |
ISD-5-S2 | 28 | 0.8 | 2.67 |
Number | Total Pore Volume (mL/g) | The Most Countable Pore Size (nm) | Harmless Hole (%) | Less Harmful Holes (%) | Harmful Holes (%) | Multi-Hazardous Holes (%) |
---|---|---|---|---|---|---|
CC-1 | 0.07835 | 77.1 | 24.67 | 17.73 | 34.8 | 22.8 |
ISDC-2 | 0.06730 | 55.3 | 22.98 | 21.5 | 27.14 | 28.38 |
ISDC-3 | 0.07506 | 40.26 | 22.93 | 31.54 | 16.09 | 29.44 |
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Zhang, Y.; Dong, M.; Zhang, W.; Chen, H.; Yang, D. Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete. Materials 2022, 15, 5162. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155162
Zhang Y, Dong M, Zhang W, Chen H, Yang D. Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete. Materials. 2022; 15(15):5162. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155162
Chicago/Turabian StyleZhang, Yannian, Mengwei Dong, Wenjie Zhang, Hao Chen, and Daokui Yang. 2022. "Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete" Materials 15, no. 15: 5162. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155162