Skip to main content

Research Repository

Advanced Search

Impact of graphene oxide and highly reduced graphene oxide on cement based composites

Qureshi, Tanvir S.; Panesar, Daman K.

Impact of graphene oxide and highly reduced graphene oxide on cement based composites Thumbnail


Authors

Tanvir S. Qureshi

Daman K. Panesar



Abstract

This study examines and compares the performance of two specific forms of graphene nanomaterials in the cement based composite, namely graphene oxide (GO) and reduced graphene oxide (rGO). A typical forms of GO with the average C:O ratio of 54:46 and a rGO with the average C:O ratio of 82:18 were used in the cement based paste composites. rGO was treated with superplasticizer to improve its dispersibility in water. Both GO and rGO were used as 0.02, 0.04, 0.06 wt% of cement. The effect of GO and rGO on workability, early age hydration, microstructure, mechanical and transport properties was determined. Different characteristics of GO and rGO such as molecular structure, functional groups, d spacing, size and physical strength influenced the properties of the cement based composites. The workability and final setting time of composite gradually decreased compared to 100% PC (control) with higher dosages of GO up to 0.06 wt% (of cement), which is due to the dominant oxygen functional groups and the hydrophilic nature of GO. To the contrary, the workability and final setting time increased in the rGO composites compared to the control mix due to the almost hydrophobic nature of rGO and the presence of superplasticiser. The XRD and TGA quantification of the hydration products shows that GO composites have a greater content of Ca(OH)2 and C-S-H compared to rGO composites measured at 1, 7 and 28 days. Micropores (smaller than ∼10 µm) in GO composites were observed to be filled with calcium silicate hydrate (C-S-H) gel and crystalline compounds. Random pore filling nature was observed in rGO composites and ettringite was more common element in those pores. Meso and gel pores (

Citation

Qureshi, T. S., & Panesar, D. K. (2019). Impact of graphene oxide and highly reduced graphene oxide on cement based composites. Construction and Building Materials, 206, 71-83. https://doi.org/10.1016/j.conbuildmat.2019.01.176

Journal Article Type Article
Acceptance Date Jan 27, 2019
Online Publication Date Feb 14, 2019
Publication Date May 10, 2019
Deposit Date Sep 30, 2020
Publicly Available Date Mar 29, 2024
Journal Construction and Building Materials
Print ISSN 0950-0618
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 206
Pages 71-83
DOI https://doi.org/10.1016/j.conbuildmat.2019.01.176
Keywords Graphene oxide (GO), Reduced graphene oxide (rGO), Nano-cement composite, Hydration process, Mechanical properties, Transport properties, Microstructure
Public URL https://uwe-repository.worktribe.com/output/6726709
Publisher URL https://www.sciencedirect.com/science/article/abs/pii/S0950061819302132

Files





You might also like



Downloadable Citations