A Raman Spectroscopic Study of Calcium Silicate Hydrate (CSH) in the Cement Matrix with CNTs and Oxide Additives. (26th April 2022)

• Record Type: Journal Article
• Authors: Azeem, Muhammad; Saleem, Muhammad Azhar
• Other Names: Makreski Petre Academic Editor.
• Is Part Of: Journal of spectroscopy. Volume 2022(2022)
• Publication Date: 2022-04-26
• Subjects: Spectrum analysis -- Periodicals; 543.505
• DOI: 10.1155/2022/2281477
• Languages: English
• ISSNs: 2314-4920

Abstract

Abstract : 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 (Gd2 O3 ), 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 Gd2 O3 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.