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The Scientific World Journal
Volume 2014, Article ID 276323, 10 pages
http://dx.doi.org/10.1155/2014/276323
Research Article

Preparation and Mechanical Properties of Graphene Oxide: Cement Nanocomposites

1Civil Engineering and Environment Faculty, Tarbiat Modares University, Tehran 111-14115, Iran
2Nanotechnology Research Center, Research Institute of Petroleum Industry, Tehran, Iran
3Civil Engineering Department, Iran University of Science and Technology, Tehran, Iran

Received 3 October 2013; Accepted 26 November 2013; Published 16 January 2014

Academic Editors: D. G. Aggelis, A. Palmeri, and E. Yasar

Copyright © 2014 Fakhim Babak et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigate the performance of graphene oxide (GO) in improving mechanical properties of cement composites. A polycarboxylate superplasticizer was used to improve the dispersion of GO flakes in the cement. The mechanical strength of graphene-cement nanocomposites containing 0.1–2 wt% GO and 0.5 wt% superplasticizer was measured and compared with that of cement prepared without GO. We found that the tensile strength of the cement mortar increased with GO content, reaching 1.5%, a 48% increase in tensile strength. Ultra high-resolution field emission scanning electron microscopy (FE-SEM) used to observe the fracture surface of samples containing 1.5 wt% GO indicated that the nano-GO flakes were well dispersed in the matrix, and no aggregates were observed. FE-SEM observation also revealed good bonding between the GO surfaces and the surrounding cement matrix. In addition, XRD diffraction data showed growth of the calcium silicate hydrates (C-S-H) gels in GO cement mortar compared with the normal cement mortar.