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HACETTEPE UNIVERSITY

Advances in physical properties of C class fly ash cement systems blended nanographite – Part 1

1 SEM image of nG 1-14 Kirgiz
2 Graphic research sequence [47, 48]
3 Average water absorptions of blended mortars compared to control mortars [47, 48]
4 Relationship between water absorption and 3rd-d flexural strength of mortars [47, 48]
5 Average apparent volumes of blended mortars compared to CMs [47, 48]
6 Relationship between apparent volume and 3rd-d compressive strength of mortars [47, 48]
7 Average apparent densities of blended mortars compared to CMs [47, 48]
8 Relationship between apparent density and 3rd-d flexural strength of mortars [47, 48]
9 CH-content difference between nG blended pastes and control pastes [47, 48]
10 Comparison of the initial and final setting times between all examined cement pastes [47, 48]
11 The effect of nG-contents on the fluidity of ASTM I, ASTM I/nG, FA–C and FA–C/nG mortars [47, 48]
12 Relationship between amount of nG and fluidity of CFA mortars [47, 48]
13 Flexural strength gain effects of nG, Ratio of flexural strength gain = 100x (Strength of mix with nG / Strength of control mix , w/c = 0.7 [47, 48]
14 Compressive strength gain effects of nG, Ratio of compressive strength gain = 100x (Strength of mix with nG / Strength of control mix , w/c = 0.767 [47, 48]
15 Rise in compressive strengths in line with increase in nG-contents [47, 48]
REM image of nanographite (EHT = 10 kV, WD = 5 mm, Signal A = InLens) Source: Graphiteexporter

Research results suggest that the use of nanographite in the CFA-C system and the pure cement system accelerate the setting time and increase the strength gains, hence overweighing any negative effects. The water absorption, apparent volume, apparent density, CH-content, setting time, fluidity and strength gain are favourable when compared to pure cement and nanographite-blended cement. Part 1 discusses materials and methods, whereas Part 2 will focus on the results and conclusions.

1 Introduction

In view of the pozzolanic activity of CFA, researchers substituted it for ordinary Portland cement in mortars, pastes and concretes. This gave rise to the CFA-C system. CFA-C exhibited some negative effects, such as slow hydration and low strength gain of fresh cement, although CFA had a pozzolanic effect on cement. In order to increase CFA usage in cements, there is a need to reduce the negative effects. Hence, it is necessary to monitor advances in the physical properties of the CFA-C system.

Researchers studying CFA-C systems thought to add nPs in order to compensate for the...

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

This article appeared in

ZKG 12/2014

This article appeared in

ZKG 12/2014

Ressort:  Materials
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