Materials Reports 2021, Vol. 35 Issue (z2): 167-171 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Preparation and Self-assembly Behavior of High Slump-retention Type Polycarboxylates Water-reducing Admixture |
PAN Yang1, WANG Yuan1, WANG Suping2, HU Zhihao2, LI Zhengping2, ZHANG Man2, ZHANG Yun1
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1 Wuhan Sanyuan Special Building Materials Co. Ltd., Wuhan 430000, China 2 Wuhan Yuanjin Building Materials Technology Co. Ltd., Wuhan 430000, China |
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Abstract High slump-retention type polycarboxylates water-reducing admixture (PCE)was prepared by free radical polymerization principle. Study on the effects of the acid/ ether ratio, the amount of hydrogen peroxide in initiator, the amount of chain transfer agent,the reaction temperatureand the ester monomer with different hydrolysis rate on the slump protection performance. Dissipation kinetics (DPD) of Material Stuido software was used to investigate the PCE self-assembly state in aqueous solution. The results show that the optimal preparation process as follows: acid/ether ratio 2.0, ester/ ether ratio 6.0, H2O2 content 1.4%, chain transfer agent 1.1%, hydroxyethyl acrylate and hydroxyl propyl acrylate were used in combination, which hydroxyl propyl acrylate accounted for 60% of the total amount of the monomer,the reaction temperature is 50 ℃. The results of DPD simulation show that the PCE has a highly curling state in water and tends to be globularl. The high slump-retention type PCE is applied to concrete which is prepared by the above technology,the slump-retention time can achieve 4 h at 30 ℃.
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Published: 09 December 2021
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About author:: Yang Pan, graduated from Shenyang University of Technology in June 2015 with a master's degree and an engineer. She has published 6 journal papers, applied several national invention patents. She is mainly engaged in the research and development of polycarboxylic acid superplasticizer. Yuan Wang, graduated from Huazhong Agricultural University in June 2012 with a master's degree and an engineer. He has published more than 10 journal papers, applied 7 national invention patents. He is mainly engaged in the research of building functional materials and new building materials. |
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