Effect of Na versus Ca Sulfate Salts on the Hydration of Calcium Sulfoaluminate Clinker
Abstract
:1. Introduction
2. Results
2.1. Isothermal Conduction Calorimetry
2.2. Mechanical Behavior
2.3. Mineralogical Characterization: Continuous X-ray Diffraction (XRD)
2.4. Mineralogical Characterization: Discontinuous XRD
2.5. Differential Thermal Analysis and Thermogravimetry (DTA/TG)
2.6. Scanning Electron Microscopy (SEM/EDX)
3. Discussion
3.1. Hydration of the KCSA Containing Anhydrite
3.2. Hydration of the KCSA Containing Na2SO4
4. Materials and Methods
4.1. Materials
4.2. Procedure
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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pH MEASUREMENTS | ||||||
---|---|---|---|---|---|---|
30 min | 1 h | 2 h | 5 h | 7 h | 24 h | |
KCSA-20NS | 11.39 | 11.40 | 11.64 | 12.42 | 12.51 | 13.19 |
Chemical Composition | Mineralogical Composition | ||||
---|---|---|---|---|---|
Oxides | KCSA | CSA | 2 ICDD PDF | KCSA | CSA |
CaO | 40.82% | 41.50% | Ye’elimite, C4A3s, (PDF = 33-0256) | 68.4 ± 0.9% | 52.6 ± 0.4% |
SiO2 | 9.51% | 8.14% | Brediggite, Ba0.293Ca13.467Mg1.81Mn0.43O32Si8 (PDF = 36-399) | 7.40 ± 0.4% | 5.0 ± 0.5% |
Al2O3 | 29.37% | 23.20% | Belite, C2S, (PDF = 86-0398) | 16.90 ± 1.0% | 14.9 ± 0.4% |
Fe2O3 | 1.32% | 1.05% | Periclase, MgO, (PDF = 4-829) | 3.67 ± 0.2% | 2.8 ± 0.3% |
MgO | 4.13% | 3.22% | Gehlenite, Al2Ca2O7Si, (PDF = 35-755) | 1.90 ± 0.4% | 1.6 ± 0.5% |
Na2O | 1.06% | 0.86% | C3A, (PDF = 70-0839) | 1.75 ± 0.4% | 1.0 ± 0.2% |
K2O | 0.47% | 0.44% | Anhydrite, CaSO4 (PDF = 72-0916) | 22.1 ± 0.4% | |
TiO2 | 0.39% | 0.32% | |||
SO3 | 9.92% | 18.36% | |||
Others | 1.70% | 1.35% | |||
1 LOI | 1.31% | 1.45% | Crystallography Open Database |
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Padilla-Encinas, P.; Palomo, A.; Fernández-Jiménez, A. Effect of Na versus Ca Sulfate Salts on the Hydration of Calcium Sulfoaluminate Clinker. Molecules 2023, 28, 7651. https://doi.org/10.3390/molecules28227651
Padilla-Encinas P, Palomo A, Fernández-Jiménez A. Effect of Na versus Ca Sulfate Salts on the Hydration of Calcium Sulfoaluminate Clinker. Molecules. 2023; 28(22):7651. https://doi.org/10.3390/molecules28227651
Chicago/Turabian StylePadilla-Encinas, Pilar, Angel Palomo, and Ana Fernández-Jiménez. 2023. "Effect of Na versus Ca Sulfate Salts on the Hydration of Calcium Sulfoaluminate Clinker" Molecules 28, no. 22: 7651. https://doi.org/10.3390/molecules28227651