Properties of Calcium Sulfoaluminate Cement Mortar Modified by Hydroxyethyl Methyl Celluloses with Different Degrees of Substitution
Abstract
:1. Introduction
2. Materials and Methods
2.1. Raw Cement
2.2. Cellulose Ether
2.3. Proportion and Mixing
2.4. Water Retention
2.5. Consistency
2.6. Fluidity
2.7. Compressive and Flexural Strengths
2.8. Tensile Bond Strength
2.9. Dry Shrinkage Rate
2.10. MIP Analysis
3. Results and Discussion
3.1. Fresh State Properties
3.2. Hardened State Properties
3.2.1. Compressive Strength
3.2.2. Flexural Strength
3.2.3. Ratio of Compressive Strength to Flexural Strength
3.2.4. Tensile Bond Strength
3.2.5. Dry Shrinkage Rate
3.3. Pore Size Distribution and Porosity
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Sample Availability
References
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SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | Na2O | K2O | TiO2 | P2O5 | |
---|---|---|---|---|---|---|---|---|---|---|
CSA1 | 13.00 | 17.80 | 1.90 | 44.90 | 2.66 | 12.60 | 0.11 | 0.41 | 0.94 | 0.16 |
CSA2 | 18.00 | 13.60 | 2.52 | 44.50 | 3.58 | 13.10 | 0.25 | 0.42 | 0.77 | 0.28 |
C4A3 | C2S | C4AF | C12A7 | CT | Gypsum | Anhydrite | Amorphous | |
---|---|---|---|---|---|---|---|---|
CSA1 | 28.4 | 17.9 | 4.0 | 1.5 | 2.6 | 1.5 | 9.6 | 19.4 |
CSA2 | 15.7 | 25.1 | 3.5 | 3.6 | 1.3 | 1.9 | 12.4 | 30.0 |
HEMC1 | HEMC2 | |
---|---|---|
Viscosity, 2% solution, 20 °C, Haake RotoVisco (mPa·s) | 35,500 | 39,100 |
Average fiber width (µm) | 7 | 18 |
Average fiber length (µm) | 290 | 126 |
Molecular mass, numbers medium (g·mol−1) | 373,000 | 577,400 |
Molecular mass, weight medium (g·mol−1) | 742,500 | 759,500 |
Drying loss (Wt %) | 3.9 | 5.6 |
Sodium chloride (Wt %) | 2.37 | 2.81 |
DS | 1.41 | 1.57 |
Total MS/DS | 1.6 | 1.90 |
Water Retention Rate/% | Consistency/mm | Fluidity/mm | |
---|---|---|---|
CSA1 | 87.0 | 20 | 130 |
CSA1 + HEMC1 | 99.8 | 38 | 136 |
CSA1 + HEMC2 | 99.7 | 40 | 142 |
CSA1 + HEMC3 | 99.9 | 35 | 144 |
CSA2 | 86.2 | 24 | 122 |
CSA2 + HEMC1 | 99.4 | 46 | 147 |
CSA2 + HEMC2 | 99.7 | 34 | 148 |
CSA2 + HEMC3 | 99.6 | 40 | 147 |
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Zhang, S.; Wang, R.; Xu, L.; Hecker, A.; Ludwig, H.-M.; Wang, P. Properties of Calcium Sulfoaluminate Cement Mortar Modified by Hydroxyethyl Methyl Celluloses with Different Degrees of Substitution. Molecules 2021, 26, 2136. https://doi.org/10.3390/molecules26082136
Zhang S, Wang R, Xu L, Hecker A, Ludwig H-M, Wang P. Properties of Calcium Sulfoaluminate Cement Mortar Modified by Hydroxyethyl Methyl Celluloses with Different Degrees of Substitution. Molecules. 2021; 26(8):2136. https://doi.org/10.3390/molecules26082136
Chicago/Turabian StyleZhang, Shaokang, Ru Wang, Linglin Xu, Andreas Hecker, Horst-Michael Ludwig, and Peiming Wang. 2021. "Properties of Calcium Sulfoaluminate Cement Mortar Modified by Hydroxyethyl Methyl Celluloses with Different Degrees of Substitution" Molecules 26, no. 8: 2136. https://doi.org/10.3390/molecules26082136