Effect of Ethylene-vinyl-acetate Copolymer on Mechanical Strength, Permeability Properties, and Hydrated Microstructure of Sprayed Concrete
ZENG Luping1, QIAO Min1, ZHAO Shuang1, WANG Wei1,*, CHEN Junsong1, ZHU Bosong1, RAN Qianping2, HONG Jinxiang1
1 Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China 2 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Abstract: The mechanical strength and permeability properties of sprayed concrete modified with ethylene-vinyl acetate copolymer ( EVA ) were evaluated, respectively in the form of redispersible polymer powder and polymer latex.And the physical film forming process and chemical action of EVA copolymer introuduced into accelerated cement paste were analyzed.The results show that particle adsorption, agglomeration and local film formation effect aroused by EVA copolymer were observed in accelerated cement paste, thus leading to the weakened formation of ettringite occurred in rapid hydration stage and retarding the early age hydration of alite minerals, especially when EVA copolymer was introduced in the form of polymer latex.Then the setting time of accelerated cement pastes is delayed significantly and the early strength is reduced with EVA copolymer.Compared to the pure sample, an increasing trend of circular bubbles with the diameter of over 130 μm was observed in hardened polymer modified sprayed concrete, thereby raising the hardened porosity and reducing the long-term strength and obvious air-entraining effect and improved spherical degree of hardened bubbles were observed with polymer powder used.At hydration time of 28 d, the continuous polymer film structure formed by EVA copolymer could be observed clearly in accelerated cement paste and fully dispersed and filled between the ettringite rods and hydration pores, thus enhancing water permeability resistance and flexural toughness of sprayed concrete, obviously.
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2025, Vol. 39 
