| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Influence of Polymers and Fibers on Early Hydration and Microstructure of Gypsum-based Materials |
| LIU Chuanbei1, GAO Jianming2, MENG Liyuan3, LIU Laibao1, ZHANG Lihua1, ZHANG Hongping1, LUO Xu2
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1 School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
2 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
3 Nanchong Sixin Building Materials Co., Ltd., Nanchong 637973, Sichuan, China |
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Abstract It is of great significance to study the early hydration and microstructure of gypsum-based materials (GM) for understanding the working mechanism of different admixtures and improving the workability of pastes. Therefore, in this work the early hydration and microstructure of GM pastes containing polyvinyl alcohol (PVA), butadiene styrene rubber (SBR), polyvinyl alcohol fiber (PVAF) and polypropylene fiber (PPF) were investigated by the hydration heat test method, oscillatory rechnology test method and environment scanning electron microscope (ESEM) coupling with liquid nitrogen cooling method. The results show that the early hydration of GM pastes can be divided into four stages, which are the dissolution of hemihydrate particles, the nucleation, growth of dihydrate crystals and the formation of crystal-network-structures (CNS).It has been pro-ven that both polymers can be adsorbed on hemihydrate particles, hindering the effective contact and dissolution of particles. Simultaneously, SBR can be also preferentially adsorbed on dihydrate crystals, impeding the growth of crystals and formation of CNS. Besides, both fibers dispersing among gypsum particles can strengthen flocculation structures, and simultaneously PVAF can absorb a lot of free water and calcium ions, which makes the preferential nucleation of crystals on its surface, therefore improving the interface and binding properties between PVAF and pastes.
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Published: 25 April 2022
Online: 2022-04-27
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| Fund:National Natural Science Foundation of China (51978590, 51808464) and Doctoral Foundation of Southwest University of Science and Technology (20zx7107). |
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2022, Vol. 36 
