Hydration of Hybrid Cements at Low Temperatures: A Study on Portland Cement-Blast Furnace Slag—Na2SO4
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Sample Preparation
2.3. Isothermal Calorimetry
2.4. Hydration Stoppage
2.5. TGA
2.6. XRD Measurement
2.7. Rietveld-PONKCS Analysis
2.8. Electron Microscopy
2.9. MIP
2.10. Selective Dissolution
3. Results
3.1. Characterisation of Cement
3.2. Compressive Strength
3.3. Hydration Kinetics
3.4. Phase Assemblage
3.5. Microstructure
4. Discussion
4.1. Second Peak in Isothermal Calorimetry
4.2. Enthalpy of Slag Hydration
4.3. Strength Development
5. Conclusions
- Compressive strength is enhanced with the addition of Na2SO4 at all studied ages (1, 7, 28 and 90 days) and curing temperatures.
- There is a significant improvement in the degree of hydration of alite after 1 day of hydration with Na2SO4, but the overall degree of reaction of clinker is very similar at later ages.
- Addition of Na2SO4 boosts the degree of hydration of slag at early ages (up to 7 days) at both 10 and 20 °C, but in the later ages, higher degree of hydration with Na2SO4 was only found for the mixture cured at 10 °C.
- Without the addition of Na2SO4, a clear peak for C3A hydration is visible, but with its addition, although a peak for C3A is not present, there is a clear hydration peak of slag.
- The enthalpy of slag hydration was found to be 498–510 J/g-slag and 587–625 J/g-slag with and without Na2SO4 addition respectively. The higher enthalpy with Na2SO4 should be due to the higher enthalpy of formation of ettringite.
- Ettringite and C-S-H are the major hydrate phases in these systems with and without Na2SO4, while a significant increase in the amount of ettringite was found for the Na2SO4 systems.
- Microstructure is densified and the overall porosity decreases with the addition of Na2SO4
- The improvement of strength with the addition of Na2SO4 is attributed to the increased reaction of cement phases and slag at early ages, while at later ages, it is due to the higher ettringite content.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Appendix A
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MIX ID | CEM III (g) | Sand (g) | Solution (g) | [Na2SO4] | w/c Ratio | S/c Ratio | Mortar Flow (mm) |
---|---|---|---|---|---|---|---|
III | 450 | 1350 | 225 | - | 0.5 | 0.5 | 130 ± 2 |
NS | 450 | 1350 | 249 | 0.75 M | 0.5 | 0.55 | 146 ± 3 |
Chemical Composition | Mineralogical Composition | Physical Properties | |||
---|---|---|---|---|---|
CaO | 48.5 | C3S | 18.0 | Blaine | 5024 cm2/g |
SiO2 | 29.4 | C2S | 2.3 | Specific gravity | 2.99 g/cm3 |
Al2O3 | 8.4 | C3A | 2.0 | ||
MgO | 5.4 | C4AF | 2.0 | Selective dissolution residue | 69.4% |
SO3 | 5.2 | Bassanite | 1.2 | ||
Fe2O3 | 1.0 | Anhydrite | 1.9 | ||
K2O | 0.6 | Quartz | 0.3 | Particle size | |
TiO2 | 0.6 | Calcite | 1.0 | d10 (µm) | 1.4 |
Na2O | 0.3 | Arcanite | 1.2 | d50 (µm) | 8.8 |
MnO | 0.2 | Syngenite | 0.9 | d90 (µm) | 21.0 |
P2O5 | 0.1 | Amorphous | 69.1 |
Elemental Ratios (wt%) | Oxide Composition (wt%) | |||||
---|---|---|---|---|---|---|
Si/Ca | Al/Si | Mg/Si | CaO | SiO2 | Al2O3 | MgO |
0.52 ± 0.07 | 0.35 ± 0.03 | 0.26 ± 0.04 | 43.3 ± 3.5 | 34.5 ± 3.7 | 10.5 ± 1.0 | 6.6 ± 1.3 |
Age (Days) | C3S | C2S | C3A | C4AF | |
---|---|---|---|---|---|
CEM III/B 42.5N | 0 | 0 (18.0) | 0 (2.3) | 0 (2.0) | 0 (2.0) |
III_10 | 1 | 37.4 (11.3) | 18.4 (1.9) | 10.6 (1.8) | −7.7 (2.2) |
7 | 92.5 (1.3) | −11.9 (2.6) | 75.0 (0.5) | 19.3 (1.6) | |
28 | 93.8 (1.1) | 4.9 (2.2) | 100 (0) | 17.1 (1.7) | |
90 | 96.3 (0.7) | 28.4 (1.6) | 100 (0) | 62.7 (0.7) | |
III_20 | 1 | 70.3 (5.3) | 0.6 (2.3) | 17.0 (1.7) | 38.6 (1.2) |
7 | 94.7 (1.0) | −14.7 (2.6) | 94.4 (0.1) | 40.4 (1.2) | |
28 | 93.3 (1.2) | −13.3 (2.6) | 100 (0) | 51.0 (1.0) | |
90 | 98.0 (0.7) | 35.7 (1.5) | 100 (0) | 71.6 (0.6) | |
NS_10 | 1 | 58.7 (7.4) | −13.9 (2.6) | 30.2 (1.4) | 6.9 (1.9) |
7 | 95.5 (0.8) | −19.0 (2.7) | 78.5 (0.4) | 17.6 (1.6) | |
28 | 96.8 (0.6) | −2.0 (2.3) | 65.6 (0.7) | 27.5 (1.5) | |
90 | 97.8 (0.4) | 29.8 (1.6) | 80.2 (0.4) | 49.8 (1.0) | |
NS_20 | 1 | 83.0 (3.1) | −4.4 (2.4) | 53.1 (0.9) | 35.1 (1.3) |
7 | 95.1 (0.9) | 2.5 (2.2) | 87.6 (0.2) | 45.0 (1.1) | |
28 | 95.2 (0.9) | 4.6 (2.2) | 76.1 (0.5) | 33.6 (1.3) | |
90 | 96.3 (0.7) | 42.8 (1.3) | 100 (0) | 63.9 (0.7) |
III_10 | III_20 | NS_10 | NS_20 | |
---|---|---|---|---|
Si/Ca | 0.54 ± 0.08 | 0.54 ± 0.13 | 0.59 ± 0.06 | 0.59 ± 0.07 |
Al/Ca | 0.17 ± 0.03 | 0.18 ± 0.05 | 0.17 ± 0.02 | 0.17 ± 0.03 |
S/Ca | 0.08 ± 0.03 | 0.06 ± 0.03 | 0.11 ± 0.03 | 0.11 ± 0.02 |
Al/Si | 0.31 ± 0.05 | 0.32 ± 0.06 | 0.31 ± 0.05 | 0.30 ± 0.05 |
Mg/Si | 0.18 ± 0.07 | 0.16 ± 0.09 | 0.23 ± 0.09 | 0.23 ± 0.12 |
Na/Ca | 0.01 ± 0.01 | 0.02 ± 0.01 | 0.12 ± 0.05 | 0.08 ± 0.05 |
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Joseph, S.; Cizer, Ö. Hydration of Hybrid Cements at Low Temperatures: A Study on Portland Cement-Blast Furnace Slag—Na2SO4. Materials 2022, 15, 1914. https://doi.org/10.3390/ma15051914
Joseph S, Cizer Ö. Hydration of Hybrid Cements at Low Temperatures: A Study on Portland Cement-Blast Furnace Slag—Na2SO4. Materials. 2022; 15(5):1914. https://doi.org/10.3390/ma15051914
Chicago/Turabian StyleJoseph, Shiju, and Özlem Cizer. 2022. "Hydration of Hybrid Cements at Low Temperatures: A Study on Portland Cement-Blast Furnace Slag—Na2SO4" Materials 15, no. 5: 1914. https://doi.org/10.3390/ma15051914