Acceleration Mechanism of Steel Slag Hydration Using THEED
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials
2.2. Testing Methods
2.2.1. Compressive Strength
2.2.2. Isothermal Calorimetry
2.2.3. XRD and TG Testing
2.2.4. Pore Structure Measurement
2.2.5. Morphology Observation
2.2.6. Elemental Concentrations of the Aqueous Phase of the SS Pastes
3. Results and Discussion
3.1. Compressive Strength
3.2. Hydration Exotherm of the Hydrating SS Pastes
3.3. XRD of Hydrating SS Pastes
3.4. TG/DTG Analysis of Hydrating SS Pastes
3.5. Pore Structure of Hydrating SS Pastes
3.6. Morphologies of Hardened SS Pastes
3.7. Dissolution and Precipitate in Hydrating SS Pastes
3.8. Acceleration Mechanism of THEED
4. Conclusions
- (1)
- THEED additions significantly increase the compressive strength of hardened steel slag paste in the early (3 d) and late (28 d) stages. The enhancement effect increases with the dosage of THEED. At a concentration of 2000 ppm, THEED increases the compressive strength of hardened SS pastes by 733%, 665%, 545% at 3 d, 7 d, and 28 d, respectively.
- (2)
- THEED additions improve the hydration degree of SS by accelerating the hydration of the aluminum phase (C3A, C12A7) and the ferrite phase (C2F) to form Mc and Pa in the presence of CaCO3. Also, the silicate hydration is increased by THEED. In this way, THEED refines the pore structure of the hardened steel slag paste by increasing the pore volume with a diameter below 300 nm to achieve an enhancement in compressive strength.
- (3)
- A working mechanism of THEED for the enhancement is proposed. The chelating solubilization effect of THEED is believed to offer the driving force for promoting the hydration of SS. The dissolution of SS is accelerated by THEED to promote the precipitation of hydration products.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Chemical Composition | CaO | SiO2 | Al2O3 | Fe2O3 | MgO | SO3 | Cl | LOI | Others |
---|---|---|---|---|---|---|---|---|---|
wt% | 39.58 | 12.41 | 4.05 | 25.57 | 5.54 | 0.35 | 0.12 | 1.85 | 10.53 |
Mineral Composition | C3S | C2S | C3A | C12A7 | C2F | FeO | Ca(OH)2 | CaCO3 |
---|---|---|---|---|---|---|---|---|
wt% | 6.48 | 27.78 | 7.95 | 0.57 | 9.78 | 12.32 | 0.64 | 0.88 |
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Yue, D.; Wang, J.; Huo, P.; Chang, L.; He, D.; Cui, S.; Liu, H. Acceleration Mechanism of Steel Slag Hydration Using THEED. Materials 2024, 17, 858. https://doi.org/10.3390/ma17040858
Yue D, Wang J, Huo P, Chang L, He D, Cui S, Liu H. Acceleration Mechanism of Steel Slag Hydration Using THEED. Materials. 2024; 17(4):858. https://doi.org/10.3390/ma17040858
Chicago/Turabian StyleYue, Deyu, Jianfeng Wang, Pengchen Huo, Lei Chang, Dingyong He, Suping Cui, and Hui Liu. 2024. "Acceleration Mechanism of Steel Slag Hydration Using THEED" Materials 17, no. 4: 858. https://doi.org/10.3390/ma17040858