| 不同梳状键接结构聚羧酸在高性能混凝土中的应用性能和作用机理 |
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| 引用本文： | 刘晓,许谦,赖光洪,管佳男,夏春蕾,王子明,崔素萍.不同梳状键接结构聚羧酸在高性能混凝土中的应用性能和作用机理[J].材料导报,2018,32(22):4011-4015. |
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| 作者姓名： | 刘晓 许谦 赖光洪 管佳男 夏春蕾 王子明 崔素萍 |
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| 作者单位： | 北京工业大学材料科学与工程学院,北京 100124,北京工业大学材料科学与工程学院,北京 100124,北京工业大学材料科学与工程学院,北京 100124,北京工业大学材料科学与工程学院,北京 100124,北京市市政工程研究院, 北京 100037,北京工业大学材料科学与工程学院,北京 100124,北京工业大学材料科学与工程学院,北京 100124 |
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| 基金项目： | 国家自然科学基金面上项目(51578025);北京市属高校高水平教师队伍建设支持计划青年拔尖人才培育计划项目(CIT&TCD201804008) |
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| 摘 要： | 梳状结构聚羧酸具有优异的分子结构可设计性,为绿色混凝土的生态化、高性能化提供了理论基础和技术支撑。本研究以聚丙烯酸(PAA)、羟基甲氧基聚氧乙烯丙烯醚(HMPEPG)、氨基甲氧基聚氧乙烯丙烯醚(AMPEPG)为反应原料,根据酯化和酰胺化反应,分别设计合成了以酯基和酰胺键接主侧链的梳状结构聚羧酸(PCE),并通过红外光谱(IR)和分子量测试证明了分子结构符合预期设计。水泥净浆和混凝土应用性能结果表明,酯基键接聚羧酸的初始净浆流动度和混凝土早期强度更优,酰胺键接聚羧酸的净浆流动度保持能力和混凝土扩展度更优。二者的作用机理存在显著差异,酯基键接聚羧酸的吸附行为更稳定,更易快速成核水化,酰胺键接聚羧酸的表面张力更低,气-液界面取向能力更强。本研究合成的酯键和酰胺键两种方式连接主侧链的梳状结构聚羧酸可分别应用于高早强要求和高泵送要求的混凝土,具有较好的应用前景和推广价值。
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| 关 键 词： | 聚羧酸 梳状结构 键接 分子设计 |
Application Performances and Mechanism of Polycarboxylic Acid in Different Comb-bonded Structures in High-performance Concrete |
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| LIU Xiao,XU Qian,LAI Guanghong,GUAN Jianan,XIA Chunlei,WANG Ziming and CUI Suping.Application Performances and Mechanism of Polycarboxylic Acid in Different Comb-bonded Structures in High-performance Concrete[J].Materials Review,2018,32(22):4011-4015. |
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| Authors: | LIU Xiao XU Qian LAI Guanghong GUAN Jianan XIA Chunlei WANG Ziming and CUI Suping |
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| Affiliation: | College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124,College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124,College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124,College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124,Beijing Municipal Engineering Research Institute, Beijing 100037,College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124 and College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124 |
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| Abstract: | The comb-type polycarboxylic acid has excellent architecture designability, providing the theoretical basis and technical support for the ecologicalization and high performance of green concrete. In this study, polyacrylic acid (PAA), hydroxymethoxy polyoxyethylene propylene glycol (HMPEPG) and amino methoxy polyoxyethylene propylene glycol (AMPEPG) were used as reactants based on the esterification and amidation reactions, and the two comb-type polycarboxylic acids (PCEs) which backbone and side chain were connected by ester bond and amide bond were synthesized, respectively. The measurements of Infrared spectroscopy (IR) and molecular weight proved the expected molecular structures. The application results showed that the PCE with ester linkage exhibited better initial fluidity of cement paste and early strength of concrete, and moreover, the PCE with amide linkage exhibited better fluidity retention of cement paste and slump flow of concrete. With respect to their different mechanism, the PCE with ester linkage behaved more stable adsorption behavior and stronger acceleration to hydration, whereas the PCE with amide linkage behaved lower surface tension and stronger ability in gas-liquid interface orientation. These two PCEs can be applied to the concretes with high early strength and high pumping requirements respectively, presenting a good promotion value and application prospect. |
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| Keywords: | polycarboxylic acid comb structure linkage molecular design |
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