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Title:

Investigation on Mechanical and Microstructural Properties of Graphene-Oxide Cement Composite

Accession Number:

01554091

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

This paper investigates the impact of microstructure of graphene oxide cement composite (GOCC) on its mechanical properties through structure and mechanical property characterization. Graphene oxide (GO) was dispersed in water with a density of 10 mg/mL and mixed with cement and water with two dosages of 0.01% and 0.05% by the weight of cement. Compressive strength tests and petrographic analyses including Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX) and X-ray Diffraction (XRD) were performed on GOCC specimens to evaluate the hydration characteristics. Chemical structure of GO is analyzed by Atomic Force Microscopy (AFM) and X-ray Photoelectron Spectroscopy (XPS). GOCC0.05 and GOCC0.01 showed 29% and 3.4% higher compressive strength than that of control specimen, respectively. Surface morphology of GOCC by SEM analysis reveals “crack bridging” effect by GO. Heterogeneous nucleation of C-S-H, enhanced by the reactive functional groups of GO, also contributes to the increase in compressive strength of GOCC specimens. Full Width at Half Maximum (FWHM) and crystallite size analyses show that the crystallite sizes of the GOCC specimens grow with hydration age; similar to grain growth of other materials, but GOCC0.05 specimens possesses much finer crystallite sizes compared to GOCC0.01. Finer crystallite sizes indicates that GO sheets can act as heterogeneous nucleation sites that decreases the activation energy for nucleation, resulting in the formation of smaller, more stable nuclei of jennite and tobermorite-9Å, which is believed to be responsible for the superior compressive strengths.

Supplemental Notes:

This paper was sponsored by TRB committee AFN15T Task Force on Nanotechnology-Based Concrete Materials.

Monograph Accession #:

01550057

Report/Paper Numbers:

15-0882

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Al-Muhit, Baig Abdullah
Nam, BooHyun
Zhai, Lei
Zuyus, Joseph

Pagination:

18p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Uncontrolled Terms:

Cement composites; Graphene oxide

Subject Areas:

Highways; Materials; I32: Concrete

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-0882

Files:

TRIS, TRB, ATRI

Created Date:

Dec 30 2014 12:23PM