Title:
Effects of Polymers on Workability and Early Microstructure of Gypsum-Based Materials
Author(s):
Xu Luo, Jianming Gao, Chuanbei Liu, and Zhizhang He
Publication:
Materials Journal
Volume:
118
Issue:
5
Appears on pages(s):
29-34
Keywords:
gypsum; hydration; microstructure; polymer; setting
DOI:
10.14359/51732929
Date:
9/1/2021
Abstract:
In this study, the effects of carboxylated styrene butadiene rubber (SBR) and polyvinyl alcohol (PVA) on fluidity and setting time of gypsum-based material (GM) pastes were investigated. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses were applied to study the early hydration and microstructure of GM pastes, further revealing the working mechanism of two polymers. The results show that the hydrophobic SBR is mainly absorbed on gypsum particles, breaking up the flocculation structures and simultaneously hindering the hydration, therefore increasing the fluidity and prolonging the setting time of GM pastes; the hydrophilic PVA can adsorb free water and therefore reduce the effective water-gypsum ratio (W/G), which promotes the formation of flocculent structures and accelerates the hydration. However, PVA could be also absorbed on gypsum particles and hinder the hydration. As a result, PVA decreases the fluidity and has little influence on setting time of GM pastes.
Related References:
1. Vimmrova, A.; Keppert, M.; Svoboda, L.; and Černý, R., “Lightweight Gypsum Composites: Design Strategies for Multi-Functionality,” Cement and Concrete Composites, V. 33, No. 1, 2011, pp. 84-89. doi: 10.1016/j.cemconcomp.2010.09.011
2. Zhu, C.; Zhang, J.; Peng, J.; Cao, W.; and Liu, J., “Physical and Mechanical Properties of Gypsum-Based Composites Reinforced with PVA and PP Fibers,” Construction and Building Materials, V. 163, 2018, pp. 695-705. doi: 10.1016/j.conbuildmat.2017.12.168
3. Gutiérrez-González, S.; Gadea, J.; Rodríguez, A.; Junco, C.; and Calderón, V., “Lightweight Plaster Materials with Enhanced Thermal Properties Made with Polyurethane Foam Wastes,” Construction and Building Materials, V. 28, No. 1, 2012, pp. 653-658. doi: 10.1016/j.conbuildmat.2011.10.055
4. Yang, J., and Yang, R., “Properties of Calcined Gypsum Modified by Composite Admixture and Its Hydration,” Journal of Building Materials, V. 17, 2014, pp. 310-313.
5. Khalil, A. A.; Tawfik, A.; Hegazy, A. A.; and El-Shahat, M. F., “Effect of Some Waste Additives on the Physical and Mechanical Properties of Gypsum Plaster Composites,” Construction and Building Materials, V. 68, 2014, pp. 580-586. doi: 10.1016/j.conbuildmat.2014.06.081
6. Murat, M., and Attari, A., “Modification of Some Physical Properties of Gypsum Plaster by Addition of Clay Minerals,” Cement and Concrete Research, V. 2, No. 2-3, 1991, pp. 378-387. doi: 10.1016/0008-8846(91)90019-E
7. Gencel, O.; del Coz Diaz, J. J.; Sutcu, M.; Koksal, F.; Álvarez Rabanal, F. P.; and Martínez-Barrera, G., “A Novel Lightweight Gypsum Composite with Diatomite and Polypropylene Fibers,” Construction and Building Materials, V. 113, 2016, pp. 732-740. doi: 10.1016/j.conbuildmat.2016.03.125
8. Gutiérrez-González, S.; Alonso, M. M.; Gadea, J.; Rodríguez, A.; and Calderón, V., “Rheological Behaviour of Gypsum Plaster Pastes with Polyamide Powder Wastes,” Construction and Building Materials, V. 38, 2013, pp. 407-412. doi: 10.1016/j.conbuildmat.2012.08.034
9. Singh, M., and Garg, M., “Retarding Action of Various Chemicals on Setting and Hardening Characteristics of Gypsum Plaster at Different pH,” Cement and Concrete Research, V. 27, No. 6, 1997, pp. 947-950. doi: 10.1016/S0008-8846(97)00045-8
10. Çolak, A., “Physical and Mechanical Properties of Polymer-Plaster Composites,” Materials Letters, V. 60, No. 16, 2006, pp. 1977-1982. doi: 10.1016/j.matlet.2005.12.062
11. Çolak, A., “Characteristics of Acrylic Latex-Modified and Partially Epoxy Impregnated Gypsum,” Cement and Concrete Research, V. 31, No. 11, 2001, pp. 1539-1547. doi: 10.1016/S0008-8846(01)00575-0
12. Rubio-Avalos, J. C.; Manzano-Ramirez, A.; Luna-Bárcenas, J. G.; Pérez-Robles, J. F.; Alonso-Guzmán, E. M.; Contreras-García, M. E.; and González-Hernández, J., “Flexural Behavior and Microstructure Analysis of a Gypsum SBR Composite Material,” Materials Letters, V. 59, No. 2-3, 2005, pp. 230-233. doi: 10.1016/j.matlet.2004.07.054
13. Bijen, J., and van der Plas, C., “Polymer-Modified Glass Fibre Reinforced Gypsum,” Materials and Structures, V. 25, No. 2, 1992, pp. 107-114. doi: 10.1007/BF02472464
14. Cao, W., and Peng, J., “Study on Properties of PVA and PVA Fibers Reinforced Gypsum Composites,” Non-Metallic Mines, V. 41, 2018, pp. 48-50.
15. Liu, C.; Gao, J.; Tang, Y.; and Chen, X., “Preparation and Characterization of Gypsum-Based Materials Used for 3D Robocasting,” Journal of Materials Science, V. 53, No. 24, 2018, pp. 16415-16422. doi: 10.1007/s10853-018-2800-8
16. Dasona Dai, M., “Fan, Preparation of Gypsum/Sawdust Green Composite with Spray Coating,” RSC Advances, V. 5, No. 117, 2015, pp. 96965-96971. doi: 10.1039/C5RA18707A
17. Wang, Q., and Jia, R., “A Novel Gypsum-Based Self-Leveling Mortar Produced by Phosphorus Building Gypsum,” Construction and Building Materials, V. 226, 2019, pp. 11-20. doi: 10.1016/j.conbuildmat.2019.07.289
18. Zhou, P.; Wu, H.; and Xia, Y., “Influence of Synthetic Polymers on the Mechanical Properties of Hardened β-Calcium Sulfate Hemihydrate Plasters,” Journal of Industrial and Engineering Chemistry, V. 33, 2016, pp. 355-361. doi: 10.1016/j.jiec.2015.10.024
19. Liu, C.; Gao, J.; Chen, X.; and Zhao, Y., “Effect of Polysaccharides on Setting and Rheological Behavior of Gypsum-Based Materials,” Construction and Building Materials, V. 267, 2021, p. 120922 doi: 10.1016/j.conbuildmat.2020.120922
20. Liu, C.; Gao, J.; Tang, Y.; and Zhao, Y., “Early Hydration and Microstructure of Gypsum Plaster Revealed by Environment Scanning Electron Microscope,” Materials Letters, V. 234, 2019, pp. 49-52. doi: 10.1016/j.matlet.2018.09.071
21. Yu, Q., and Brouwers, H. J. H., “Microstructure and Mechanical Properties of β-Hemihydrate Produced Gypsum: An Insight From Its Hydration Process,” Construction and Building Materials, V. 25, No. 7, 2011, pp. 3149-3159. doi: 10.1016/j.conbuildmat.2010.12.005
22. Yu, Q., and Brouwers, H. J. H., “Microstructure and Mechanical Properties of B-Hemihydrate Produced Gypsum: An Insight From Its Hydration Process,” Construction and Building Materials, V. 25, No. 7, 2011, pp. 3149-3157. doi: 10.1016/j.conbuildmat.2010.12.005
23. Peng, J.; Qu, J.; Zhang, J.; Chen, M.; and Wan, T., “Adsorption Characteristics of Water Reducing Agents on Gypsum Surface and Its Effect on the Rheology of Gypsum Plaster,” Cement and Concrete Research, V. 35, No. 3, 2005, pp. 527-531. doi: 10.1016/j.cemconres.2004.04.016