Time-dependent rheological behavior of hydrating cement paste containing calcium carbonate whiskers

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-09-26 DOI:10.1016/j.cemconcomp.2024.105775

Wen Si , Xing Ming , Mingli Cao

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Abstract

In this research, the action mechanism of aragonite calcium carbonate whiskers (CW) on the time-dependent rheological performance during early cement paste hydration are examined by combining rheometer, calorimetry, thermogravimetry (TG/DTG), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) and free water content test. Regarding time-dependent rheological properties, it is found that CW can improve the rheological parameters of cement paste and converse the fluidity behavior by means of morphological and chemical effects. Free water content and FT-IR results indicate that CW can absorb free water to retard rheological properties loss. In terms of early hydration of cement paste, new hydration products are generated due to the chemical effects of CW, which can be verified by XRD, DTG and energy-dispersive X-ray spectroscopy (EDS). And the increase in content of ettringite, Ca(OH)₂ and gel/space ratio induced by participation of CW can also be distinctly observed. After discussing the time-dependent rheological parameters and hydration characteristic parameters, it has been clarified that the primary factor contributing to the increase in time-dependent rheological parameters is the reduction in free water content. However, the incorporation of CW intensifies the cement hydration process, leading to the predominant influence of hydrated phase contents and particle size on the system.

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含有 CaCO3 晶须的水化水泥随时间变化的流变行为

本研究结合流变仪、量热仪、热重仪 (TG/DTG)、X 射线衍射 (XRD)、傅立叶变换红外光谱 (FT-IR) 和游离水含量测试，研究了文石 CaCO3 晶须 (CW) 在水泥早期水化过程中对随时间变化的流变性能的作用。研究发现，CW 可以改善随时间变化的流变学参数，并通过机械和化学作用改变流动性。游离水含量变化规律与傅立叶变换红外光谱结果之间的对应关系表明，化武可以吸收游离水，从而延缓流变性能的损失。通过 XRD、DTG 和能量色散 X 射线光谱（EDS）验证，CW 不可忽视的化学效应是生成新的水合产物。此外，CW 诱导的埃特林岩、Ca(OH)2 (101) 和凝胶/空间比的增加也是基质增强的原因。在讨论了随时间变化的流变参数和水化特征参数后，提出了含 CW 水泥浆的屈服应力/塑性粘度与水化时间之间的联系。

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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.