Graphene/fly ash geopolymeric composites as self-sensing structural materials

Saafi, Mohamed and Tang, Leung and Fung, Jason and Rahman, Mahbubur and Sillars, Fiona and Liggat, John and Zhou, Xiangming (2014) Graphene/fly ash geopolymeric composites as self-sensing structural materials. Smart Materials and Structures, 23 (6). ISSN 0964-1726

Full text not available from this repository.

Abstract

The reduction of graphene oxide during the processing of fly ash-based geopolymers offers a completely new way of developing low-cost multifunctional materials with significantly improved mechanical and electrical properties for civil engineering applications such as bridges, buildings and roads. In this paper, we present for the first time the self-sensing capabilities of fly ash-based geopolymeric composites containing in situ reduced graphene oxide (rGO). Geopolymeric composites with rGO concentrations of 0.0, 0.1 and 0.35% by weight were prepared and their morphology and conductivity were determined. The piezoresistive effect of the rGO-geopolymeric composites was also determined under tension and compression. The Fourier transform infrared spectroscopy (FTIR) results indicate that the rGO sheets can easily be reduced during synthesis of geopolymers due to the effect of the alkaline solution on the functional groups of GO. The scanning electron microscope (SEM) images showed that the majority of pores and voids within the geopolymers were significantly reduced due to the addition of rGO. The rGO increased the electrical conductivity of the fly ash-based rGOgeopolymeric composites from 0.77 S m−1 at 0.0 wt% to 2.38 S m−1 at 0.35 wt%. The rGO also increased the gauge factor by as much as 112% and 103% for samples subjected to tension and compression, respectively.

Item Type:
Journal Article
Journal or Publication Title:
Smart Materials and Structures
Additional Information:
Acceptance: 17/03/2014
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/aacsb/disciplinebasedresearch
Subjects:
ID Code:
75629
Deposited By:
Deposited On:
15 Sep 2015 15:20
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jul 2020 02:19