重新审视水泥中碳纳米管团聚体的影响

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2024-10-15 DOI:10.1016/j.carbon.2024.119710

Xinming Wang , Jing Zhong

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引用次数: 0

摘要

碳纳米管（CNT）团聚体通常被认为是水泥基体中的缺陷，但对其产生的原因和方式却没有清晰的物理化学描述。通过用碳纳米管海绵粉（CNTSPPs）代表碳纳米管团聚体，我们发现水合物可在 CNTSPPs 的孔隙中析出，形成碳纳米管/水合物纳米复合壳，其厚度和密实度取决于固化温度。与 CNTSPPs 在标准固化条件下对样品的不利影响相反，添加 0.05 wt % CNTSPPs 后，28d 抗压强度比蒸汽固化条件下的参考样品提高了 16 %。这是因为蒸汽固化条件大大提高了 CNTSPPs 的亲水性，使其吸收孔隙溶液和钙离子，最终增加了 CNT/水合物纳米复合材料的外壳厚度和微硬度。这种具有高机械性能的纳米复合材料外壳可以屏蔽多孔内CNTSPPs的负面影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Revisiting the effects of carbon nanotube agglomerates in cement

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Revisiting the effects of carbon nanotube agglomerates in cement

Agglomerates of carbon nanotube (CNT) are typically considered as defects in cement matrix, yet without a clear physiochemical picture regarding why and how. By representing CNT agglomerates with CNT sponge powders (CNTSPPs), we discovered that hydrates can precipitate in the pores of CNTSPPs to form a CNT/hydrates nanocomposite shell, the thickness and compactness of which are dependent on the curing temperature. In contrast to the detrimental effects of CNTSPPs for the samples cured under standard condition, the addition of 0.05 wt % CNTSPPs increased the 28d compressive strength by ∼16 % compared to the reference sample under steam curing condition. This is because steam curing condition significantly improves the hydrophilicity of CNTSPPs, resulting in its absorption of pore solution and calcium ions, which eventually increase the CNT/hydrates nanocomposites shell thickness and microhardness. Such nanocomposites shell with high mechanical properties can screen the negative effects of the porous inner CNTSPPs.

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.