HACETTEPE UNIVERSITY

Supernatant nanographite solution for advance treatment of C class fly ash cement systems – Part 1

1 SEM image of nG

2 Schematic flow showing the progression of sedimentation of nGs inside a tube during ultracentrifugation

10 The effect of nG contents on the fluidity of ASTM I, ASTM I/nG, FA–C and FA–C/nG mortars [w/c = 0.76, w/s = 0.16, c/s = 0.21]

11 Compressive strength gain effects of nG, Ratio of compressive strength gain = 100x (Strength of mix with nG / strength of control mix) [w/c = 0.76, w/s = 0.16, c/s = 0.21]

All Kirgiz

Compressive strength experiment with M5

All Kirgiz

This paper examines the effects of extremely dispersed nG by ultrasonication on the CFA-C system. CFA-C systems blended with nG and ultrasonicated nG are developed and some problems in the CFA-C system, such as delaying of setting time and reduction of strength gain at early ages, are overcome. Experimented properties of CFA-Cs and pure Portland cements are the absorbance spectra of ultrasonicated nG, contents of CH, setting times, fluidities, and compressive strengths according to present standard methods. Part 1 discusses introduction, materials and methods, whereas Part 2 will focus on the results and conclusions.

1 Introduction

Researches suggest replacing the CFA for ordinary Portland cement in mortars, pastes and concretes due to pozzolanic activity of CFA and sustainability of pure Portland cement. The conventional CFA-C system is also developed by scientists, researchers and cement manufacturers. This conventional CFA-C system exhibits such negative side effects as slow setting time and low strength gain at early ages although CFA has a pozzolanic and hydraulic effect on cement. In order to increase CFA use in cement, more than ever, there is a need to improve these aforementioned negative side...

TEXT Dr. Mehmet Serkan Kirgiz, Hacettepe University PolatlıTechnical SciencesVocational School, Ankara/Turkey

Issue 5/2015 HACETTEPE UNIVERSITY

Supernatant nanographite solution for advance treatment of C class fly ash cement systems – Part 1

1 Introduction

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1 Introduction

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