Study on the Properties of Belite Calcium Sulfoaluminate Cement–Ordinary Portland Cement Composite Cementitious System
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Mixture Proportions and Sample Preparation
2.3. Methods
2.3.1. Setting Time
2.3.2. Early Stiffening Test
- (1)
- When the percentage of I/F is ≥50%, it was judged as normal setting.
- (2)
- When the percentage of I/F is <50%, it was considered that the cement was abnormally setting (false set or flash set), so we remixed the paste without adding water, and then measured R. If R < I, the cement was false set, and if R > I, the cement was flash set.
2.3.3. Heat of Hydration
2.3.4. XRD Analysis
2.3.5. Mechanical Properties
2.3.6. Drying Shrinkage
2.3.7. TG-DSC Analysis
2.3.8. SEM Analysis
2.3.9. Pore Size Distribution
3. Results
3.1. Analysis of Physical and Mechanical Properties of Composite Cement Systems
3.1.1. Setting Time
3.1.2. Early Stiffening Test
3.1.3. Heat of Hydration
3.1.4. Mechanical Properties
3.1.5. Drying Shrinkage
3.1.6. Pore Size Distribution
3.2. Compositional and Micromorphological Analysis of Hydration Products
3.2.1. XRD Analysis
3.2.2. TG–DSC Analysis
3.2.3. SEM Analysis
4. Conclusions
- (1)
- The setting time of the BCSA–OPC decreased with the increase in BCSA dosage, and except for BCSA dosage of 60–80%, the rest of the cement could be set normally.
- (2)
- The exothermic rate of hydration of the BCSA–OPC in the preinduction period increased compared with that of OPC, which is due to the increase in C4A3$. The exothermic rate of hydration of the BCSA–OPC in the later periods decreased compared with that of OPC, which is due to the decrease in C3S and the retardation effect of gypsum.
- (3)
- The mechanical properties of the BCSA–OPC mortar increased with the increase in BCSA dosage. Compared with OPC, the flexural strengths at the hydration ages of 1 d, 3 d, 7 d, and 28 d of the BCSA–OPC with 50% BCSA dosage were improved by 33.3%, 36.6%, 23.6%, and 26.8%, respectively, and the compressive strengths were improved by 50.8%, 35.7%, 13.4%, and 27.7%, respectively. This is attributed to the filling effect of a large amount of AFt intertwined with the fibrous C-S-H gel to form a network and make the mortar dense.
- (4)
- The drying shrinkage and total porosity of the BCSA–OPC mortar decreased with the increase in BCSA dosage. The drying shrinkage and total porosity of B50 at the hydration age of 28 d were reduced by 117.4% and 21.55%, respectively. This is due to the fact that AFt has the effect of compensating the shrinkage and blocking the pore size to reduce the water loss.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Chemical Analysis | CaO | SiO2 | Al2O3 | MgO | Fe2O3 | SO3 | K2O | Na2O | etc. |
---|---|---|---|---|---|---|---|---|---|
OPC | 54.32 | 24.30 | 9.71 | 3.93 | 3.03 | 2.69 | 0.63 | 0.37 | 1.02 |
BCSA | 45.59 | 16.30 | 15.33 | 3.98 | 1.32 | 15.40 | 0.47 | 0.25 | 1.36 |
Category | B0 | B10 | B20 | B30 | B40 | B50 | B60 | B70 | B80 | B90 | B100 |
---|---|---|---|---|---|---|---|---|---|---|---|
BCSA | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
OPC | 100 | 90 | 80 | 70 | 60 | 50 | 40 | 30 | 20 | 10 | 0 |
Category | OPC | BCSA | Standard Sand | Water |
---|---|---|---|---|
B0 | 450 | 0 | 1350 | 225 |
B10 | 405 | 45 | 1350 | 225 |
B20 | 360 | 90 | 1350 | 225 |
B30 | 315 | 135 | 1350 | 225 |
B40 | 270 | 180 | 1350 | 225 |
B50 | 225 | 225 | 1350 | 225 |
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Xin, X.; Duan, G.; Zhu, J.; Hou, P.; Zhao, P.; Du, P.; Wang, S.; Huang, Y. Study on the Properties of Belite Calcium Sulfoaluminate Cement–Ordinary Portland Cement Composite Cementitious System. Buildings 2024, 14, 890. https://doi.org/10.3390/buildings14040890
Xin X, Duan G, Zhu J, Hou P, Zhao P, Du P, Wang S, Huang Y. Study on the Properties of Belite Calcium Sulfoaluminate Cement–Ordinary Portland Cement Composite Cementitious System. Buildings. 2024; 14(4):890. https://doi.org/10.3390/buildings14040890
Chicago/Turabian StyleXin, Xiangyu, Guangbin Duan, Jiang Zhu, Pengkun Hou, Piqi Zhao, Peng Du, Shoude Wang, and Yongbo Huang. 2024. "Study on the Properties of Belite Calcium Sulfoaluminate Cement–Ordinary Portland Cement Composite Cementitious System" Buildings 14, no. 4: 890. https://doi.org/10.3390/buildings14040890