Influence of functional group's grafting position in polycarboxylate superplasticizer molecule on its dispersibility and mechanism

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-05-03 DOI:10.1016/j.cemconres.2025.107919

Bin Li, Ling Wang, Zhendi Wang, Mingwei Wang

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Abstract

This study aims at clarifying the effect of the functional group's grafting positions in PCE molecule on its dispersing performance, adsorption behavior, molecular conformation and cement pastes' setting times. Two kinds of PCEs modified by β-cyclodextrin (β-CD) with different grafting positions were synthesized. Test results showed that the grafting position of β-CD in PCE molecule significantly influences its adsorption behavior and molecular conformation. (β-M)_n-AA-HPEG with β-CD grafted on the main chain effectively increases adsorption amount on cement and decreases surface adsorption on clay. While PAA-g-(β-P)_nHPEG with β-CD grafted on the side chain slightly decreases adsorption amount on cement and hinders both surface and interlayer adsorption by clay. Moreover, DLS test results showed that the side chain as the grafting position would increase PCE's steric hindrance more effectively than grafting at the main chain. Surprisingly, through adjusting the grafting position, the setting times of cement pastes have exhibited the opposite trend.

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聚羧酸型高效减水剂分子中官能团接枝位置对其分散性的影响及其机理

本研究旨在阐明PCE分子中官能团接枝位置对其分散性能、吸附行为、分子构象和水泥浆凝结次数的影响。合成了两种不同接枝位置的β-环糊精（β-CD）修饰pce。实验结果表明，β-CD在PCE分子中的接枝位置显著影响其吸附行为和分子构象。主链接枝β-CD的（β-M）n-AA-HPEG有效增加了在水泥上的吸附量，降低了在粘土上的表面吸附量。而侧链接枝β-CD的PAA-g-(β-P)nHPEG在水泥上的吸附量略有下降，并阻碍了粘土对其表面和层间的吸附。此外，DLS测试结果表明，侧链接枝比主链接枝更能有效地增加PCE的位阻。令人惊讶的是，通过调整接枝位置，水泥浆体的凝结次数呈现相反的趋势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.