HACETTEPE UNIVERSITY

Advances in physical properties
of C class fly ash cement systems
blended nanographite – Part 2

1-14 Kirgiz

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]

Source: Graphiteexporter

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 discussed materials and methods, Part 2 focuses on the results and conclusions.

3 Results and discussions

3.1 Water absorption

These mortars are completely immersed in water to evaluate their water-absorption capacity. The average water absorptions of the blended mortars compared to CMs are presented in Figure 3.

It can be suggested that prolonged curing, increasing the age and percentages of nG, can lead to a reduction in permeable voids. This is due to the high action and activation effects of nG. Another result is that the interfacial transition zone in mortars is enhanced due to the high reactivity, as well as to the activation effect of the nG. This result partially...

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

Advances in physical properties
of C class fly ash cement systems
blended nanographite – Part 2

3 Results and discussions

3.1 Water absorption

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