Preparation of Nano-Sized C-S-H and Its Acceleration Mechanism on Portland Cement Hydration at Different Temperatures
Abstract
:1. Introduction
2. Materials and Experiments
2.1. Raw Materials
2.2. Preparation of Nano C-S-H
2.3. Preparation of Mortar, Paste and Concrete
2.4. Test Methods
3. Results and Discussion
3.1. Stability and Size of Nano-Sized C-S-H Suspension
3.2. Hydration Process of Cement
3.3. Early Strength Enhancement of Nano C-S-H
3.4. Early Strength Enhancement of Nano-Sized C-S-H at 10 °C
4. Conclusions
- Nano-sized C-S-H with semi-crystalline structures were prepared. The average size of nano-sized C-S-H increased with an increase in the theoretical concentration, and a slight precipitation in the suspension was observed when the theoretical concentration was 2%. The D(90) values of S1 and S2 are 105.2 nm and 117.3 nm, respectively, and the average sizes of S1 and S2 are 154.2 nm and 181.3 nm, respectively.
- Nano-sized C-S-H promotes the hydration process of cement mainly by accelerating the reaction degree of C3S, especially within the first 24 h of casting. The 8 h, 16 h, 24 h Ca(OH)2 contents in hydrated cement increased by 62.9%, 89.5% and 91.2%, respectively.
- The 8 h, 16 h and 24 h compressive strength of mortars containing nano-sized C-S-H increased by 176.0%, 145.6% and 43.9%, respectively, compared with the reference mortar, while the 3 d flexural strength and compressive strength show a slightly decrease.
- Nano-sized C-S-H improved the hydration degree of Portland cement cured at 10 °C, but the enhancement was much lower than for that cured at 20 °C.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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SiO2 | CaO | MgO | Fe2O3 | Al2O3 | K2O | Na2O | SO3 | LOI |
---|---|---|---|---|---|---|---|---|
20.31 | 62.58 | 2.93 | 3.73 | 4.38 | - | - | 2.45 | 1.58 |
Specimen | Na2O | MgO | Al2O3 | SiO2 | P2O5 | K2O | CaO | Fe2O3 |
---|---|---|---|---|---|---|---|---|
Grade IFly ash | 1.75 | 1.46 | 26.54 | 48.92 | 0.15 | 2.03 | 4.82 | 4.59 |
Ultrafine slag | - | 8.43 | 1.24 | 32.21 | - | - | 37.52 | 15.28 |
Mix Design | Cement | Fly ash | Slag | Gravel | Sand | Water | AEa | n-C-S-Hb |
---|---|---|---|---|---|---|---|---|
H0 | 384 | 72 | 24 | 1020 | 724 | 136 | 2.4 | 0 |
H1 | 384 | 72 | 24 | 1020 | 724 | 136 | 2.4 | 24, S1 |
H2 | 384 | 72 | 24 | 1020 | 724 | 136 | 2.4 | 24, S2 |
Band | Specimen | Assigned to | |||
---|---|---|---|---|---|
S1 | S2 | S3 | S4 | ||
a | 449 | 452 | 451 | 451 | ν4Si–O (SiO4Td) |
b | 671 | 671 | 671 | 670 | ν4Si–O–Si |
c | 968 | 970 | 972 | 966 | ν3Si–O(C–S–H) Q2 |
d | 1489 | 1471 | 1426 | 1427 | ν3CO (CO32-) |
e | 1641 | 1640 | 1639 | 1640 | ν3OH (H2O) |
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Fang, Y.; Zhang, L.; Li, L.; Zhao, M.; Wang, Q.; Mei, Y. Preparation of Nano-Sized C-S-H and Its Acceleration Mechanism on Portland Cement Hydration at Different Temperatures. Materials 2023, 16, 3484. https://doi.org/10.3390/ma16093484
Fang Y, Zhang L, Li L, Zhao M, Wang Q, Mei Y. Preparation of Nano-Sized C-S-H and Its Acceleration Mechanism on Portland Cement Hydration at Different Temperatures. Materials. 2023; 16(9):3484. https://doi.org/10.3390/ma16093484
Chicago/Turabian StyleFang, Yanfeng, Limin Zhang, Li Li, Mingyu Zhao, Qing Wang, and Yong Mei. 2023. "Preparation of Nano-Sized C-S-H and Its Acceleration Mechanism on Portland Cement Hydration at Different Temperatures" Materials 16, no. 9: 3484. https://doi.org/10.3390/ma16093484