氧化石墨烯对粉煤灰基地聚合物浆料抗冻融损伤及损伤后碳化性能的影响

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

Cement & concrete composites Pub Date : 2025-03-05 DOI:10.1016/j.cemconcomp.2025.106023

Zhipeng Li , Xianming Shi

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引用次数: 0

摘要

地聚合物是水泥的可持续替代品。我们使用氧化石墨烯（GO）来有效增强碱活化粉煤灰基地聚合物（FAGPR）浆料的抗冻融（F/T）能力。为了揭示氧化石墨烯作为一种添加剂在减缓FAGPR降解中的有益作用，本研究比较了原始FAGPR膏体和氧化石墨烯工程化的对应物（GFAGPR）在循环F/T过程前后的微观性能。采用x射线衍射（XRD）、热重分析（TGA）、扫描电镜（SEM）、能谱（EDS）、傅立叶变换红外光谱（FTIR）和核磁共振（NMR）等方法对浆料样品的化学成分、微观结构、元素分布、化学键和结构有序进行了表征。实验结果表明，氧化石墨烯通过控制关键元素的分布，调控C-S-H/C-A-S-H凝胶的形成，提高其聚合度。Ca阳离子与带负电荷的GO之间的相互作用减轻了F/T过程中Ca的浸出，从而使风化后的ggfagpr膏体保持较高的残余抗压强度和较高的聚合度。

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Influence of graphene oxide on resistance of a fly ash-based geopolymer paste to cyclic freeze-thaw damage and post-damage carbonation

Geopolymer is a sustainable alternative to cement. We employed graphene oxide (GO) to effectively enhance the freeze-thaw (F/T) resistance of an alkali-activated fly ash-based geopolymer (FAGPR) paste. To unravel the beneficial role of GO as an admixture in mitigating the degradation of FAGPR, this study compared the microscopic properties of the original FAGPR paste and its GO-engineered counterpart (GFAGPR) before and after the cyclic F/T process. For these paste samples, their chemical components, microstructure, elemental distribution, chemical bonds, and structure ordering were examined by X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), and Nuclear Magnetic Resonance (NMR), respectively. The experimental results suggest that GO regulated the formation of C-S-H/C-A-S-H gels and improved their polymerization degree by controlling the distribution of key elements. The interaction between Ca cations and negatively charged GO mitigated the leaching of Ca during the F/T process and thus helped the weathered GFAGPR paste maintain higher residual compressive strength and higher polymerization degree.

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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.