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首页> 外文会议>International Conference on Superplasticizers and Other Chemical Admixtures in Concrete >Effect of Amphoteric Comb-Like Copolymer Dispersant on Dispersibility and Dispersibility Retention of Cement Pastes
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Effect of Amphoteric Comb-Like Copolymer Dispersant on Dispersibility and Dispersibility Retention of Cement Pastes

机译：两性梳状共聚物分散剂对水泥浆料分散性和分散性保留的影响

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摘要

Polycarboxylate superplasticizers have revolutionized concrete technology in the past years. Their Comb-like structure consisting of a polyelectrolyte backbone and nonionic poly (ethylene oxide)-based "teeth"side chains offers a huge opportunity to polymer design. However, to our knowledge, almost all polycarboxylate belong to anionic copolymers. In this study, amphoteric comb-like copolymers (PAMP) with different molar ratio of anionic to cationic group in main chain were synthesized and characterized. The effects of molar ratio of anionic to cationic group in main chain on dispersion, dispersibility retention, adsorption behavior and early hydration behavior in fresh cement suspensions were investigated systematically to elucidate their mechanisms. The moderate incorporation of cationic group into comb-like copolymers improved the dispersion ability. However, when the content of cationic group was further increased, as the adsorbed amount of PAMP was increased, the dispersibility became worse. The fluidity retention for PAMP was enhanced with increasing cationic content in main chain. Besides, there is a negative correlation between the dispersibility retention ratio and copolymer concentration in solution. The adsorption sites, adsorption conformation and early hydration behavior should be together considered to explain its dispersion and the dispersibility retention of cement pastes with amphoteric copolymers. Besides, there exists an optimal balance between the molar ratios of anionic to cationic groups in backbone of comb-like copolymers.
机译：多羧酸盐超塑料在过去几年中具有革新的混凝土技术。它们由聚电解质主链和非离子聚（环氧乙烷）组成的梳状结构，基于“齿”侧链为聚合物设计提供了巨大的机会。然而，对于我们的知识，几乎所有的多元羧酸盐属于阴离子共聚物。在该研究中，合成并表征具有不同摩尔比的阴离子与阳离子基团不同摩尔比的两性梳状共聚物（PAMP）。系统地研究了对多水泥悬浮液中的分散，分散性保留，吸附性能和早期水化行为的主链中阴离子对阳离子基团的影响。将阳离子组的中度掺入梳状共聚物改善了分散能力。然而，当阳离子组的含量进一步增加时，随着吸附量的粘合剂的增加，分散性变得更糟。随着主链中的阳离子含量增加，粘合性的流动性保持性得到增强。此外，在溶液中的分散性保持率和共聚物浓度之间存在负相关性。吸附位点，吸附构象和早期水合行为应在一起考虑解释其分散和水溶性保留水泥浆料与两性共聚物。此外，在梳状共聚物的骨干中阴离子的阴离子摩尔比之间存在最佳平衡。

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