Abstract
Reduced graphene oxide (rGO) has been widely used to modify the mechanical performance of alkali activated slag composites (AASC); however, the mechanism is still unclear and the electrical properties of rGO reinforced AASC are unknown. Here, the rheological, mechanical, and electrical properties of the AASC containing rGO nanosheets (0, 0.1, 0.2, and 0.3% wt.) are investigated. Results showed that rGO nanosheets addition can significantly improve the yield stress, plastic viscosity, thixotropy, and compressive strength of the AASC. The addition of 0.3% wt. rGO nanosheets increased the stress, viscosity, thixotropy, and strength by 186.77 times, 3.68 times, 15.15 times, and 21.02%, respectively. As for electrical properties, the impedance of the AASC increased when the rGO content was less than 0.2% wt. but decreased with the increasing dosage. In contrast, the dielectric constant and electrical conductivity of the AASC containing rGO nanosheets decreased and then increased, which can be attributed to the abundant interlayer water and the increasing structural defects as the storage sites for charge carriers, respectively. In addition, the effect of graphene oxide (GO) on the AASC is also studied and the results indicated that the agglomeration of GO nanosheets largely inhibited the application of it in the AASC, even with a small dosage.
Highlights
Global warming and climate change related closely to carbon dioxide (CO2 ) emissions has sparked enormous concerns for the international community
Zhou et al [23] further demonstrated that the addition of graphene oxide (GO) nanosheets can increase the viscosity of the activated slag composites (AASC) by about 20 times when the shear rate was 0.05 s−1, and the relationship between the viscosity and the shear rate transformed from a linear correlation to a non-linear one due to a decrease in the size of the GO nanosheet
The characterization of well dispersed GO nanosheets and reduced graphene oxide (rGO) nanosheets is clearly shown in Figures 6 and 7
Summary
Global warming and climate change related closely to carbon dioxide (CO2 ) emissions has sparked enormous concerns for the international community. The effect of the content of rGO nanosheets on mechanical strength of the AASC under this preparation procedure is still unclear. Zhou et al [23] further demonstrated that the addition of GO nanosheets can increase the viscosity of the AASC by about 20 times when the shear rate was 0.05 s−1 , and the relationship between the viscosity and the shear rate transformed from a linear correlation to a non-linear one due to a decrease in the size of the GO nanosheet As another graphene derivative, the effect of rGO nanosheets on rheological behaviors of the AASC is unclear. The rheological, mechanical, and electrical properties of the AASC containing rGO nanosheets (0.1, 0.2, and 0.3% wt.) were investigated in this study. This paper gives new insights into the material design of the HPCM made from the AASC and graphene derivatives
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