Effect of C-S-H Nucleating Agent on Cement Hydration
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Synthesis of CNA
2.3. Specimen Preparation
2.4. Methods
2.4.1. Hydration Heat Test and Calculation of Hydration Kinetics
2.4.2. Electrical Resistivity Test
2.4.3. Backscattered Electron Imaging Analysis (BSE)
2.4.4. Semi-Quantitative Analysis of C-S-H Content
2.4.5. Mechanical Properties Test
3. Results and Discussion
3.1. Hydration Heat
3.2. Electrical Resistivity
3.3. Amount of C-S-H
3.4. BSE Images Analysis
3.5. Mechanical Properties of Cement Mortars
4. Conclusions
- The incorporation of CNA does not change the hydration mechanism of cement, which increases the hydration degree in the nucleation and crystal growth stage (NG) by 0.5, and the interactions at phase boundaries diffusion stage(I) by 0.02, which makes the cement obtain a higher degree of hydration in the initial stage of hydration;
- CNA shortens the beginning time of the induction period by 49.3 min and the end time of the cement hydration acceleration period by 105.1 min than the Blank sample, which can accelerate the setting and hardening of the cement;
- CNA significantly improves the hydration degree of cement mixtures cured for 28 days, which is better than triethanolamine (TEA). CNA increases the fractal dimension of hydration products, while TEA decreases the fractal dimension;
- CNA used in this work may provide a crystal nucleus for the generation of C-S-H gel, which reduces the potential energy of C-S-H gel generation and promotes the generation of C-S-H gel. The C-S-H content of cement mixtures with CNA is higher than that with TEA or the blank sample;
- CNA significantly improves the early strength of cement mortars; the 1-day and 3-day strength of cement mortars with CNA are more than the 3-day and 7-day strength of the blank sample, which shows that it has an excellent early strength effect.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Composition | SiO2 | Fe2O3 | Al2O3 | CaO | MgO | SO3 | f-CaO | LOI | Total |
---|---|---|---|---|---|---|---|---|---|
Content (%) | 22.62 | 3.65 | 5.29 | 65.12 | 1.61 | 0.45 | 1.0 | 0.26 | 100 |
Types | Temperature of Hydration/℃ | n | KNG | KI | KD |
---|---|---|---|---|---|
BLANK | 20.0 | 1.98 | 0.050 | 0.013 | 0.0025 |
CNA | 20.0 | 1.81 | 0.059 | 0.017 | 0.0033 |
Types | Peak1 Time (min) | Peak2 Time (min) | Primary Peak Time (min) |
---|---|---|---|
BLANK | 124.2 | 422.7 | 555.4 |
CNA | 74.9 | 340.6 | 450.3 |
TEA | 93.6 | 368.6 | 481.7 |
Types | BET Surface (m2/g) | Amount of C-S-H (%) |
---|---|---|
BLANK | 18.29 | 13.49 |
CNA | 28.87 | 25.44 |
TEA | 17.77 | 12.91 |
Types | Hydration Degree | Fractal Dimension of Hydration Products |
---|---|---|
BLANK | 0.632 | 1.62 |
CNA | 0.641 | 1.67 |
TEA | 0.615 | 1.56 |
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Zhao, W.; Ji, X.; Jiang, Y.; Pan, T. Effect of C-S-H Nucleating Agent on Cement Hydration. Appl. Sci. 2021, 11, 6638. https://doi.org/10.3390/app11146638
Zhao W, Ji X, Jiang Y, Pan T. Effect of C-S-H Nucleating Agent on Cement Hydration. Applied Sciences. 2021; 11(14):6638. https://doi.org/10.3390/app11146638
Chicago/Turabian StyleZhao, Wenhao, Xu** Ji, Yaqing Jiang, and Tinghong Pan. 2021. "Effect of C-S-H Nucleating Agent on Cement Hydration" Applied Sciences 11, no. 14: 6638. https://doi.org/10.3390/app11146638