Research on the Hydration Properties of C4A3S-CSH2 Cement System at Different Temperatures
Abstract
:1. Introduction
2. Materials and Methods
2.1. C4A3S Synthesis
2.2. Antifreeze Preparation
2.3. Compressive Strength Test
Sample Preparation
2.4. Methods
2.4.1. X-ray Diffraction
2.4.2. Thermogravimetric Analysis
2.4.3. Scanning Electron Microscopy
2.4.4. Mercury Intrusion Analysis
3. Results
3.1. Phase Identification for the Clinker
3.2. Hydration Products
3.3. Hydration Degree Analysis
3.4. Scanning Electron Microscopy Analysis
3.5. Compressive Strength Analysis
3.6. Mercury Intrusion Analysis
4. Conclusions
- Hydration of the C4A3S-CSH2 cement system could be carried out at low temperatures, even at temperatures as low as −15 °C. The main hydration product at −15 °C, 0 °C and 20 °C was ettringite, together with a small amount of AFm and AH3. Low temperatures were unable to change the types of the hydration products, but the low temperature of 0 °C was more favorable for the formation of ettringite.
- At low temperatures of −15 °C and 0 °C, the early hydration of the C4A3S-CSH2 system could be inhibited. However, hydration of the system at 0 °C continued beyond one day and the hydration degree was higher than that at 20 °C.
- The morphologies of the AFt for the C4A3S-CSH2 cement system could be altered by different low temperatures. The AFt develops as needle-like structure at −15 °C to form a loose structure, while it develops a columnar structure at 0 °C to form a denser structure.
- A low temperature was not conducive to the compressive strength of the system at a very early stage, but the compressive strength developed rapidly at the later stage for the system at 0 °C. For hydration at 28 days, the compressive strength at 0 °C reached its maximum, which was significantly higher than that at 20 °C. There was a positive correlation between the early compressive strength and AFt content. The higher the early strength of the cement system, the greater the ettringite content. The later compressive strength tended to depend on the microstructure development and porosity.
Author Contributions
Funding
Conflicts of Interest
References
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Age | −15 °C | 0 °C | 20 °C |
---|---|---|---|
1 day | 17.5% | 39.6% | 53.1% |
3 days | 33.3% | 63.9% | 60.3% |
7 days | 36.8% | 68.8% | 63.6% |
28 days | 40.1% | 72.2% | 66.8% |
Sample | 1 Day | 3 Days | 7 Days | 28 Days | ||||
---|---|---|---|---|---|---|---|---|
Compressive Strength/MPa | AFt/% | Compressive Strength/MPa | AFt/% | Compressive Strength/MPa | AFt/% | Compressive Strength/MPa | AFt/% | |
−15 °C | 5.6 | 7.5 | 10.0 | 11.5 | 15.6 | 18.4 | 22.1 | 20.0 |
0 °C | 14.2 | 23.2 | 46.6 | 39.5 | 67.0 | 43.6 | 82.0 | 54.0 |
20 °C | 28.1 | 34.5 | 35.5 | 36.1 | 45.2 | 40.0 | 41.0 | 36.6 |
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Li, M.; Lan, M.; Chen, Z.; Wang, J.; Cui, S.; Wang, Y. Research on the Hydration Properties of C4A3S-CSH2 Cement System at Different Temperatures. Materials 2020, 13, 4000. https://doi.org/10.3390/ma13184000
Li M, Lan M, Chen Z, Wang J, Cui S, Wang Y. Research on the Hydration Properties of C4A3S-CSH2 Cement System at Different Temperatures. Materials. 2020; 13(18):4000. https://doi.org/10.3390/ma13184000
Chicago/Turabian StyleLi, Min, Mingzhang Lan, Zhifeng Chen, Jianfeng Wang, Suping Cui, and Yali Wang. 2020. "Research on the Hydration Properties of C4A3S-CSH2 Cement System at Different Temperatures" Materials 13, no. 18: 4000. https://doi.org/10.3390/ma13184000