Materials Reports  2020, Vol. 34 Issue (Z1): 596-600 |
| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Preparation and Application of Esterification Modified Anti-mud PolycarboxylicAcid Water Reducer |
| JI Xiankun1, WANG Yuan1, WANG Suping2, HU Zhihao2
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1 Wuhan Sanyuan Special Building Materials Co., Ltd., Wuhan 430000, China;
2 Wuhan Ujoin Building Material Technology Co., Ltd., Wuhan 430000, China |
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Abstract Polycarboxylic acid superplasticizer is sensitive to aggregate mud content, which greatly reduces its performance and effect, and seriously affects the working performance of concrete. A kind of anti-mud polycarboxylic acid water reducer was synthesized by molecular structure design, anti-mud monomer M was synthesized by esterification of succinic anhydride (MAD) with isopentenol polyoxyethylene ether (TPEG), then copolymerized with 4-hydroxybutyl vinyl polyoxyethylene ether (GPEG), acrylamide (AM) and acrylic acid (AA) to form anti-mud polycarboxylic acid water reducer KNV with long branched ester group structure. The results show that the esterification modified anti-mud polycarboxylic acid water reducer KNV prepared by esterification of anti-mud monomer with n(MAD)∶n(TPEG)=3∶1 has good dispersion and retention properties. Compared with the commercially available anti-mud polycarboxylic acid water reducer M12, with the increase of soil content, the anti-mud effect of KNV is better than that of M12. The addition of 2. 0% sodium bentonite to different type of cement shows good cement adaptability and mud resistance.When the same kind of cement was added with 2.0% different kinds of soil, the anti-mud effect and adaptability of KNV to different kinds of soil were better than those of M12. The application of KNV to concrete also has excellent mud resistance, which can reduce the amount of water reducer, improve the workability of concrete and increase the compressive strength of concrete.
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Published: 01 July 2020
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| About author:: Xiankun Ji, master, senior engineer, graduated from Chongqing University, majoring in materials science and engineering, civil engineering, China expert member of Concrete Quality Specialty Committee of Engineering Society, China Association for Engineering Construction Standardization Building Waterproofing and expert member of the Commission of Protection, Minister of Science and Technology Engineering of Wuhan Yuanjin Building Materials. His research field is concrete engineering technology, crack control technology, concrete durability and testing technology, tailings resource utilization technology.He won 1 first prize and 2 second prizes of Huaxia Construction Science and Technology and completed1 second prize of Guangdong Civil Architecture Association One monograph (co-author), and more than 40 academic papers were published. Participated in a number of “12th Five-Year Plan”, 11th Five Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete Standard (GB/T50082-2009), Standard for Durability Testing and Evaluation of Concrete (JGJ/T 193-2009), General Code for Design of Concrete Mixture Ratio (JGJ 55-2011), Standard for Concrete Quality Control (GB50164-2011), Magnesium oxide expansion agent for concrete (CBMF19-2017), Magnesium oxide for concrete shall Technical Specification “Technical Regulations for Application of Magnesium Oxide for Concrete” and other national standards. |
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