HACETTEPE UNIVERSITY

Supernatant nanographite solution for advance­ treatment of C class fly ash cement systems – Part 2

This paper examines the effects of extremely dispersed nG by ultrasonication on the CFA-C system. The subject of Part 1 were the chapters Introduction, Materials and Methods, whereas Part 2 now focuses on Results and Conclusions. Research results indicate that the use of ultrasonicated nG is shown to be favorable in terms of the absorbance spectra of ultrasonicated nG, CH-contents, setting times, rheologies and strength gains at early ages.

3 Results and discussions

3.1. Absorbance spectra

The UV-visible spectra displays an increasing absorbance attributed to the graphitic p-plasmon resonance. For the concentrated suspension, the peak is not as well distinguished, indicating that the nGs are relatively more concentrated. The concentration of the nGs in the suspensions has been quantified by using Beer’s law, which illustrates a linear relationship between the optical absorbance and the concentration of the substance. Generally, the intensity of the corresponding spectra depends on the concentration of the nGs – i.e., samples with...

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