碳纳米管和氧化物添加剂水泥基体中水合硅酸钙(CSH)的拉曼光谱研究

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-04-26 DOI:10.1155/2022/2281477

M. Azeem, M. Saleem

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引用次数: 2

摘要

采用拉曼光谱法比较了不同类型碳纳米管(CNTs)和氧化物添加剂混合后水泥浆体中水合硅酸钙(CSH)的浓度。在这项工作中使用了原始的、羟基的和羧基功能化的碳纳米管。氧化添加剂为氧化锌(ZnO)、氧化钆(Gd2O3)和氧化硅(SiO2)。采用波长为785 nm的激光采集拉曼光谱。观察到，无论碳纳米管的类型和重量百分比如何，碳纳米管- opc基质中水合硅酸钙(CSH)的浓度都不受影响。正如预期的那样，氧化物对基质中CSH的浓度有显著影响。在氧化锌和Gd2O3基体中，水泥使CSH浓度增加。而对于SiO2水泥膏体基质，CSH浓度呈现下降趋势。该研究表明，碳水化合物浓度可以通过使用氧化物添加剂来控制，而碳纳米管不会与水泥复合材料发生化学反应。

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A Raman Spectroscopic Study of Calcium Silicate Hydrate (CSH) in the Cement Matrix with CNTs and Oxide Additives

The calcium silicate hydrate (CSH) concentration in the cement paste mixed with different types of carbon nanotubes (CNTs) and oxide additives is compared by using Raman spectroscopy. The pristine, hydroxyl and carboxyl functionalized CNTs are used in this work. The oxide additives are zinc oxide (ZnO), gadolinium oxide (Gd2O3), and silicon oxide (SiO2). A laser wavelength of 785 nm was used to collect the Raman spectra. It was observed that the concentration of calcium silicate hydrate (CSH) is unaffected in CNTs-OPC matrices regardless of the type and weight percentage of the CNTs. The oxides, as expected, show significant effects on the concentration of the CSH in the matrices. An increase in the CSH concentration is observed in the ZnO and Gd2O3 matrices with cement. For the SiO2 cement paste matrix, however, the CSH concentration appears to be decreased. This study shows CSH concentration can be controlled by using oxide additives whereas CNTs do not react chemically with the cement composites.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.