Performance of polycarboxylate superplasticisers in seawater-blended cement: Effect from chemical structure and nano modification

IF 6.1 3区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nanotechnology Reviews Pub Date : 2023-01-01 DOI:10.1515/ntrev-2023-0573

Jun Ren, Shuo Yan, Yunhui Fang, Zhenhe Tian, Hao Li, J. Guo, F. Xing, Yiding Fan, Xianfeng Wang, Zengle Ren

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Abstract

Abstract The performance of polycarboxylate superplasticisers (PCE) in cement blended with seawater (SW) depends on its molecular structure since large ions in SW significantly influenced its mechanism. The aim of this study was to investigate the effect of the molecular structure of PCE on the fresh properties of SW-blended cement pastes. A series of six PCEs with different charge densities, side chain lengths, and anchor groups were modified by introducing nanosilica and their physicochemical properties were characterised, and the performance was evaluated by determined by minislump, rheological behaviour and setting time. Finally, the potential mechanism was proposed via measurement of adsorption amount and layer thickness, and water film thickness (WFT). The results showed that the PCE with longer side chains and higher AA:HEPG ratio provided a significant improvement in the workability of cement pastes mixed with SW. According to the flow curves from the rheology experiments, analysis of the rheological behaviour of polycarboxylate superplasticisers in SW-blended cements paste by three rheological models. By adsorption measurement and WFT testing, high higher AA:HPEG ratio exhibits high sorption and WFT indicating less inhibition by ions in SW. Graphical abstract

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聚羧酸型高效增塑剂在海水水泥中的性能:化学结构和纳米改性的影响

摘要聚羧酸系高效减水剂（PCE）在掺海水水泥（SW）中的性能取决于其分子结构，因为SW中的大离子对其作用机理有显著影响。本研究的目的是研究PCE的分子结构对SW掺合水泥浆体新鲜性能的影响。通过引入纳米二氧化硅对一系列具有不同电荷密度、侧链长度和锚定基团的六种PCE进行了改性，并对其物理化学性质进行了表征，并通过微块、流变行为和凝固时间来评估其性能。最后，通过测量吸附量、层厚度和水膜厚度，提出了潜在的机理。结果表明，具有较长侧链和较高AA:HEPG比例的PCE显著改善了掺SW水泥浆的工作性能。根据流变实验的流动曲线，采用三种流变模型分析了聚羧酸系高效减水剂在SW水泥浆体中的流变行为。通过吸附测量和WFT测试，较高的AA:HPEG比率表现出较高的吸附性，WFT表明SW中离子的抑制作用较小。图形摘要

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来源期刊

Nanotechnology Reviews CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

11.40

自引率

13.50%

发文量

137

审稿时长

7 weeks

期刊介绍： The bimonthly journal Nanotechnology Reviews provides a platform for scientists and engineers of all involved disciplines to exchange important recent research on fundamental as well as applied aspects. While expert reviews provide a state of the art assessment on a specific topic, research highlight contributions present most recent and novel findings. In addition to technical contributions, Nanotechnology Reviews publishes articles on implications of nanotechnology for society, environment, education, intellectual property, industry, and politics.