Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization
Abstract
:1. Introduction
2. Results and Discussion
2.1. Effects of Initiator, Macromonomer and Reaction Temperature on the Fluidities of Cement Paste
Composition | SiO2/% | CaO/% | Al2O3/% | Fe2O3/% | MgO/% | SO3/% | Na2O/% |
Reference cement | 22.93 | 66.23 | 4.29 | 2.89 | 1.92 | 0.35 | 0.70 |
Composition | C3S/% | C2S/% | C3A/% | C4AF/% | Loss/% | f-CaO/% | – |
Reference cement | 58.78 | 21.38 | 6.49 | 8.77 | 1.48 | 0.64 |
Initiator | Macromonomer | Temperature/°C | Fluidity/mm | ||
---|---|---|---|---|---|
5 min | 1 h | 2 h | |||
BPO | IPEG | 80 | – | – | – |
TPEG | 80 | – | – | – | |
IPEG | 85 | 210 ± 5 | 80 ± 10 | – | |
TPEG | 85 | – | – | – | |
IPEG | 90 | – | – | – | |
TPEG | 90 | – | – | – | |
AIBN | IPEG | 75 | 315 ± 5 | 180 ± 5 | 165 ± 0 |
TPEG | 75 | 247.5 ± 2.5 | 160 ± 5 | 100 ± 10 | |
IPEG | 80 | 295 ± 0 | 130 ± 10 | 120 ± 5 | |
TPEG | 80 | 260 ± 0 | 255 ± 5 | 250 ± 0 | |
IPEG | 85 | 187.5 ± 2.5 | 85 ± 10 | – | |
TPEG | 85 | 197.5 ± 2.5 | 190 ± 5 | 147.5 ± 2.5 |
2.2. Effects of Addition of the Third Monomer on the Fluidities of Cement Paste
Third Monomer | Fluidity/mm | ||
---|---|---|---|
5 min | 1 h | 2 h | |
MA | 137.5 ± 2.5 | – | – |
FA | 280 ± 5 | 245 ± 5 | 210 ± 10 |
None | 260 ± 0 | 255 ± 5 | 250 ± 0 |
2.3. 1H NMR of PCE
2.4. Molecular Weight of PCE
2.5. Setting Times of Cement Pastes
Sample | Dosage/% | Water/g | Setting Time | |
---|---|---|---|---|
Initial Setting/min | Final Setting/min | |||
Blank | 0 | 138 | 197 ± 3 | 250 ± 5 |
AIBN-IPEG-75 | 0.2 | 115.1 | 197 ± 5 | 240 ± 2 |
AIBN-IPEG-80 | 0.2 | 117.4 | 178 ± 1 | 235 ± 3 |
AIBN-TPEG-75 | 0.2 | 116.2 | 160 ± 2 | 210 ± 5 |
AIBN-TPEG-80 | 0.2 | 124.2 | 184 ± 2 | 259 ± 3 |
AIBN-TPEG-85 | 0.2 | 122.9 | 201 ± 3 | 233 ± 3 |
AIBN-TPEG-FA-80 | 0.2 | 118.1 | 189 ± 1 | 225 ± 4 |
2.6. Hydration Heat
2.7. Preparation and Dispersion Mechanisms of PCE
3. Experimental Section
3.1. Materials
3.2. Synthesis of PCE
3.3. Preparation of Powdered PCE
3.4. Tests and Measurements
3.4.1. 1H NMR Analysis
3.4.2. Molecular Weight and Its Distribution
3.4.3. Fluidity of Cement Paste
3.4.4. Setting Times of Cement Paste
3.4.5. Hydration Heat
4. Conclusions
Acknowledgments
Author Contrbutions
Conflicts of Interest
References
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Liu, X.; Wang, Z.; Zheng, Y.; Cui, S.; Lan, M.; Li, H.; Zhu, J.; Liang, X. Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization. Materials 2014, 7, 6169-6183. https://doi.org/10.3390/ma7096169
Liu X, Wang Z, Zheng Y, Cui S, Lan M, Li H, Zhu J, Liang X. Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization. Materials. 2014; 7(9):6169-6183. https://doi.org/10.3390/ma7096169
Chicago/Turabian StyleLiu, Xiao, Ziming Wang, Yunsheng Zheng, Suping Cui, Mingzhang Lan, Huiqun Li, Jie Zhu, and Xu Liang. 2014. "Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization" Materials 7, no. 9: 6169-6183. https://doi.org/10.3390/ma7096169