缓释型多氯化聚乙烯设计和水泥浆流动性控制的创新策略

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-10-02 DOI:10.1016/j.cemconcomp.2024.105785

Zheng Chen , Ben Chen , Yunchao Tang , Guoxin Zhao , Zichao Pang , Caijun Shi

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引用次数: 0

摘要

通过添加含有缓释成分的外加剂来延长水泥浆流动性的保持时间，是确保水泥基材料建筑质量的标准做法。本研究旨在利用具有不同侧链结构的时变释放型多氯化聚乙烯（TRPCEs）来控制多氯化聚乙烯的释放速率，并增强其在新拌水泥浆中的时变分散效果。利用凝胶渗透色谱法（GPC）、傅立叶变换红外光谱法（FTIR）和质子核磁共振法（1H NMR）研究了合成的 TRPCEs 的结构特征。此外，还进行了不同剂量 TRPCEs 的时变流动性实验，以研究时变释放效应下的流动性变化。通过测量水泥浆的早期水化热，使用等温量热法研究了 TRPCEs 对水泥水化的影响。此外，还使用 TOC（总有机碳）分析仪检测了 TRPCEs 随时间变化的吸附行为。研究结果表明，由于初始分散效应的变化，TRPCEs 对水泥水化过程的快速反应期影响较小，但对诱导期和加速期影响不大。此外，由于缓释基团的水解作用，TRPCEs 在水泥颗粒上的吸附行为也有很大不同。在不同水化阶段，TRPCEs 在水泥颗粒和水化产物上的不同吸附和消耗是水泥浆流动性随时间变化的关键控制因素。最后，这种创新方法为设计和制备具有较强时变流动性保持能力的新型 PCE 提供了新的视角。

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Innovative strategies for time-release PCE design and cement paste flowability control

Extending the retention time of cement paste flowability with the addition of admixtures containing slow-release components is standard practice for ensuring the continued building quality of cement-based materials. This study aims to control the release rate of PCE and enhance its time-varying dispersion effect in fresh cement paste by utilizing Time-dependent Release PCEs (TRPCEs) with varying side-chain structures. The structural characterization of the synthesized TRPCEs was investigated using GPC (Gel Permeation Chromatography), FTIR (Fourier Transform Infrared Spectroscopy), and ¹H NMR (Proton Nuclear Magnetic Resonance) techniques. Furthermore, experiments were carried out on time-varying flowability with different dosages of TRPCEs to investigate the flowability changes under the time-varying release effect. The influence of TRPCEs on cement hydration was examined using isothermal calorimetry by measuring the early hydration heat of cement paste. The time-dependent adsorption behaviors of TRPCEs were also examined using a TOC (Total Organic Carbon) analyzer. The findings show that TRPCEs have a minor effect on the cement hydration process's rapid reaction period but little effect on its induction and acceleration periods because of variations in the initial dispersion effect. Additionally, the adsorption behaviors of TRPCEs on cement particles vary significantly due to the hydrolysis of slow-release groups. The varying adsorption and consumption of TRPCEs on cement particles and hydration products in different hydration phases are key controlling factors for the time-varying flowability changes in cement paste. Finally, this innovative approach offers a novel perspective for designing and preparing new types of PCEs with a strong capability for time-varying flowability retention.

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.