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Investigation of the Mechanical Properties and Microstructure of Graphene Nanoplatelet-Cement Composite

In this work, graphene nanoplatelets (GNPs) were dispersed uniformly in aqueous solution using methylcellulose (MC) as a dispersing agent via ultrasonic processing. Homogenous GNP suspensions were incorporated into the cement matrix to investigate the effect of GNPs on the mechanical behavior of cem...

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Detalles Bibliográficos
Autores principales: Wang, Baomin, Jiang, Ruishuang, Wu, Zhenlin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5245736/
https://www.ncbi.nlm.nih.gov/pubmed/28335328
http://dx.doi.org/10.3390/nano6110200
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author Wang, Baomin
Jiang, Ruishuang
Wu, Zhenlin
author_facet Wang, Baomin
Jiang, Ruishuang
Wu, Zhenlin
author_sort Wang, Baomin
collection PubMed
description In this work, graphene nanoplatelets (GNPs) were dispersed uniformly in aqueous solution using methylcellulose (MC) as a dispersing agent via ultrasonic processing. Homogenous GNP suspensions were incorporated into the cement matrix to investigate the effect of GNPs on the mechanical behavior of cement paste. The optimum concentration ratio of GNPs to MC was confirmed as 1:7 by ultraviolet visible spectroscopy (UV-Vis), and the optical microscope and transmission electron microscopy (TEM) images displayed remarkable dispersing performance. The GNP–cement composite exhibited better mechanical properties with the help of surface-modified GNPs. The flexural strength of cement paste increased up to 15%–24% with 0.05 wt % GNPs (by weight of cement). Meanwhile, the compressive strength of the GNP–cement composite increased up to 3%–8%. The X-ray diffraction (XRD) and thermal analysis (TG/DTG) demonstrated that the GNPs could accelerate the degree of hydration and increase the amount of hydration products, especially at an early age. Meanwhile, the lower porosity and finer pore size distribution of GNP–cement composite were detected by mercury intrusion porosimetry (MIP). In addition, scanning electron microscope (SEM) analysis showed the introduction of GNPs could impede the development of cracks and preserve the completeness of the matrix through the plicate morphology and tortuous behavior of GNPs.
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spelling pubmed-52457362017-03-21 Investigation of the Mechanical Properties and Microstructure of Graphene Nanoplatelet-Cement Composite Wang, Baomin Jiang, Ruishuang Wu, Zhenlin Nanomaterials (Basel) Article In this work, graphene nanoplatelets (GNPs) were dispersed uniformly in aqueous solution using methylcellulose (MC) as a dispersing agent via ultrasonic processing. Homogenous GNP suspensions were incorporated into the cement matrix to investigate the effect of GNPs on the mechanical behavior of cement paste. The optimum concentration ratio of GNPs to MC was confirmed as 1:7 by ultraviolet visible spectroscopy (UV-Vis), and the optical microscope and transmission electron microscopy (TEM) images displayed remarkable dispersing performance. The GNP–cement composite exhibited better mechanical properties with the help of surface-modified GNPs. The flexural strength of cement paste increased up to 15%–24% with 0.05 wt % GNPs (by weight of cement). Meanwhile, the compressive strength of the GNP–cement composite increased up to 3%–8%. The X-ray diffraction (XRD) and thermal analysis (TG/DTG) demonstrated that the GNPs could accelerate the degree of hydration and increase the amount of hydration products, especially at an early age. Meanwhile, the lower porosity and finer pore size distribution of GNP–cement composite were detected by mercury intrusion porosimetry (MIP). In addition, scanning electron microscope (SEM) analysis showed the introduction of GNPs could impede the development of cracks and preserve the completeness of the matrix through the plicate morphology and tortuous behavior of GNPs. MDPI 2016-11-04 /pmc/articles/PMC5245736/ /pubmed/28335328 http://dx.doi.org/10.3390/nano6110200 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Baomin
Jiang, Ruishuang
Wu, Zhenlin
Investigation of the Mechanical Properties and Microstructure of Graphene Nanoplatelet-Cement Composite
title Investigation of the Mechanical Properties and Microstructure of Graphene Nanoplatelet-Cement Composite
title_full Investigation of the Mechanical Properties and Microstructure of Graphene Nanoplatelet-Cement Composite
title_fullStr Investigation of the Mechanical Properties and Microstructure of Graphene Nanoplatelet-Cement Composite
title_full_unstemmed Investigation of the Mechanical Properties and Microstructure of Graphene Nanoplatelet-Cement Composite
title_short Investigation of the Mechanical Properties and Microstructure of Graphene Nanoplatelet-Cement Composite
title_sort investigation of the mechanical properties and microstructure of graphene nanoplatelet-cement composite
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5245736/
https://www.ncbi.nlm.nih.gov/pubmed/28335328
http://dx.doi.org/10.3390/nano6110200
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