Ceramics-Silikáty |
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EFFECTS OF ETHYLENE-VINYL ACETATE ON THE MECHANICAL PROPERTIES, HYDRATION EVOLUTION AND FLAME RETARDANCY OF POLYMER-MODIFIED CEMENT-BASED COATINGS TO PREVENT GAS LEAKAGE IN COAL MINE TUNNELS
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Zhang Haiming 1, Diao Zhaoxu 1, Gan Xingyu 1, Huang Ziyi 1, Ma Kai 1, Li Laibo 1,2, Lu Lingchao 1
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1 Shandong Provincial Key Laboratory of Green and Intelligent Building Materials, University of Jinan, Jinan 250022, China
2 Linyi Conch New Material Technology Co., Ltd, Linyi 276034, China
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Keywords: Polymer-modified cement-based coatings, Ethylene-vinyl acetate powders, Elongation at break, Mechanical properties, Flame retardancy
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Coatings play a crucial role in coal mine tunnels, aimed at preventing gas leakage. This risk means that the coating must have a qualified flame retardancy and excellent deformation capabilities. Polymer-modified cement-based coatings present a viable option to satisfy these demands. This study focuses on the impact of ethylene-vinyl acetate (EVA) powders on the properties of polymer-modified cement-based coatings for preventing gas leakage in coal mines. The results show that the coating’s elongation at break increases as the EVA content rises. The 28-day-cured coating had an elongation at a break of 8.2% when the EVA content was 20 wt.%. The tensile strength and bond strength of the 20 wt.% EVA-containing coating were 12.9% and 127.3% higher than the control group, reaching 3.9 MPa and 2.5 MPa, respectively. However, a higher amount of EVA led to reduced flame retardancy. The coating with 20 wt.% EVA content not only met the flame retardancy requirements, but also had excellent mechanical properties and workability. During the hydration process, EVA affected the heat release and promoted cement hydration. |
doi: 10.13168/cs.2025.0038
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